To determine the percent yield of the reaction. to compare the actual yield (the amount of product obtained experimentally) to the theoretical yield (the amount of product that would be obtained according to stoichiometry).
Given:
Moles of H2 consumed = 3.50 mol
Mass of H2O produced = 50.0 g
Step 1: Calculate the molar mass of H2O.
The molar mass of H2O is calculated by summing the atomic masses of hydrogen (H) and oxygen (O):
Molar mass of H2O = (2 × atomic mass of H) + atomic mass of O
Molar mass of H2O = (2 × 1.008 g/mol) + 16.00 g/mol
Molar mass of H2O = 18.02 g/mol
Step 2: Calculate the theoretical yield of H2O.
Theoretical yield of H2O = Moles of H2 × (Molar mass of H2O / Moles of H2O per mole of H2)
The balanced equation for the reaction is:
2 H2 + O2 → 2 H2O
From the equation, we can see that 2 moles of H2 produce 2 moles of H2O.
So, Moles of H2O per mole of H2 = 2
Theoretical yield of H2O = 3.50 mol × (18.02 g/mol / 2)
Theoretical yield of H2O = 31.535 g
Step 3: Calculate the percent yield.
Percent yield = (Actual yield / Theoretical yield) × 100
Percent yield = (50.0 g / 31.535 g) × 100
Percent yield ≈ 158.9%
Rounding to the nearest tenths place, the percent yield of the reaction is approximately 158.9%.
Learn more about theoretical yield here
https://brainly.com/question/14966377
#SPJ11
Calculate the molecular weight of Na2sio3
Answer:
Answer:122 g/ mol
Answer:122 g/ molExplanation:
Answer:122 g/ molExplanation:first must find the molar mass of each element in the compound
Answer:122 g/ molExplanation:first must find the molar mass of each element in the compoundNa= 23×2 =46 g/mol
Answer:122 g/ molExplanation:first must find the molar mass of each element in the compoundNa= 23×2 =46 g/molSi= 28 g/mol
Answer:122 g/ molExplanation:first must find the molar mass of each element in the compoundNa= 23×2 =46 g/molSi= 28 g/molO= 16× 3 = 48 g/ mol
Answer:122 g/ molExplanation:first must find the molar mass of each element in the compoundNa= 23×2 =46 g/molSi= 28 g/molO= 16× 3 = 48 g/ molhence , summation of the molar masses
Answer:122 g/ molExplanation:first must find the molar mass of each element in the compoundNa= 23×2 =46 g/molSi= 28 g/molO= 16× 3 = 48 g/ molhence , summation of the molar masses46+28+48 = 122g/mol
The molecular weight of [tex]\rm Na_2SiO_3[/tex] (sodium silicate) is approximately 122.07 g/mol.
To calculate the molecular weight of [tex]\rm Na_2SiO_3[/tex] (sodium silicate), we need to add the atomic weights of each individual element in the compound.
The atomic weights are as follows:
- Sodium (Na) = 22.99 g/mol
- Silicon (Si) = 28.09 g/mol
- Oxygen (O) = 16.00 g/mol
Now, multiply the atomic weights by the number of atoms in the compound:
- Sodium (Na) = 2 atoms * 22.99 g/mol = 45.98 g/mol
- Silicon (Si) = 1 atom * 28.09 g/mol = 28.09 g/mol
- Oxygen (O) = 3 atoms * 16.00 g/mol = 48.00 g/mol
Finally, add up all the atomic weights:
[tex]\rm \[Molecular \, weight \, of \, Na2SiO3 = 45.98 g/mol + 28.09 g/mol + 48.00 g/mol \\= 122.07 g/mol\][/tex]
So, the molecular weight of [tex]\rm Na_2SiO_3[/tex] (sodium silicate) is approximately 122.07 g/mol.
Know more about sodium silicate:
https://brainly.com/question/15030271
#SPJ3
PLEASE HURRY AND HELP
Write the empirical formula for at least four ionic compounds that could be formed from the following ions:
Fe²+, CH₂CO₂, Pb4+, MnO-4
Answer:
Fe(CH₂CO₂)₂, Fe₂MnO, Pb(CH₂CO₂)₄, PbMnO
Explanation:
Cations (positively charged ions) can only form ionic bonds with anions (negatively charged ions). However, you can't just simply put one cation and one anion together to form a compound. Each compound needs to been neutral, or have an overall charge of 0. When cations and anions do not have charges that perfectly cancel, you need to modify the amount of each ion in the compound.
1.) Fe(CH₂CO₂)₂
----> Fe²⁺ and 2 CH₂CO₂⁻
----> +2 + (-1) + (-1) = 0
2.) Fe₂MnO
----> 2 Fe²⁺ and 1 MnO⁴⁻
----> 2(+2) + (-4) = 0
3.) Pb(CH₂CO₂)₄
----> 1 Pb⁴⁺ and 4 CH₂CO₂⁻
----> +4 + (-1) + (-1) + (-1) + (-1) = 0
4.) PbMnO
----> 1 Pb⁴⁺ and 1 MnO⁴⁻
----> +4 + (-4) = 0
There are millions of organic compounds but only thousands of inorganic compounds because:______
Answer:
There are millions of organic compounds but only thousands of inorganic compounds because:
a. organic compounds were formed by living things.
b. there is more carbon on Earth's surface than any other element.
c. atoms of elements other than carbon never combine with themselves.
d. carbon atoms can combine with up to four other atoms, including other carbon atoms.
The correctly reported volume for a rectangular solid that is found to be
12.49 cm x 4.00 cm x 0.90 cm is
cm³?
Why is the practice of using a spatula to scoop powder from a bottle discouraged?
Answer:
it's both impossible and inefficient
Explanation:
think about it, if your spatula can even fit in the bottle will it take out a measured amount of powder? if the spatula has holes in it the powder will fall out and you will have to restart the experiment
If the same test, given at different points in time to the same test takers, yields different scores, then the method typically used to assess this source of error is_________.
If the same test, given at different points in time to the same test takers, yields different scores, then the method typically used to assess this source of error is alternate form.
What is alternate forms test?
An alternate form or parallel form test is a test which is conducted at different time on the same set of test takers in order to test the reliability of the results obtained.
In conclusion, alternate or parallel form tests is a test of reliability.
Learn more about alternate forms tests at: https://brainly.com/question/14745567
#SPJ1
How many sulfur dioxide molecules are in 2.8 moles of sulfur dioxide?
Answer:
1,69 x10²⁴
Explanation:
Answered it in the comments! ^^
The "barking dog" reaction is an exciting combustion reaction that generates a bright blue flame because sulfur is produced during the reaction (sulfur burns blue!). At the end of the reaction, a "woosh" sound is made which sounds like a dogs bark (hence the name of the reaction). Assume the reaction is carried out in a closed container. CS₂ + 4N₂0 CO₂ + SO₂ + S + 4N₂ Note: the equation is balanced How many moles of CO₂ can you generate if you were to carry out the reaction with 8.28 g CS₂?
From the mole ratio CO₂ and CS₂ in the reaction, the moles of CO₂ produced is 0.109 moles.
What is the mole ratio of the reaction?
The mole ratio of the reaction is the ratio in which the reactants combine to form products.
The mole ratio of the reaction is obtained from the equation of the reaction.
The equation of the reaction is given below:
CS₂ + 4N₂0 → CO₂ + SO₂ + S + 4N₂Mole ratio of CO₂ and CS₂ is 1 : 1
Moles of CS₂ reacting = mass/molar mass
Molar mass of CS₂ is 76 g/mol
Mass of CS₂ reacting is 8.28 g
Moles of CS₂ reacting = 8.28/76
Moles of CS₂ reacting = 0.109 moles
Based on the mole ratio of the reaction, moles of CO₂ produced is 0.109 moles.
In conclusion, the moles of CO₂ produced is determined from the mole ratio CO₂ and CS₂ in the reaction.
Learn more about mole ratio at: https://brainly.com/question/19099163
#SPJ1
If the ph of a solution is 6.1 what is the concentration of h+ ions in the solution
Answer:
[tex]10^{-6} \frac{mol}{L}[/tex]
Explanation:
Comparing to the solution consisting a pH of 5 containing [tex]10^{-5}[/tex] [tex]\frac{mol}{L}[/tex] of hydrogen ions, a solution having a pH of 6 consists of [tex]10^{-6} \frac{mol}{L}[/tex] of hydrogen ions. A solution having a pH of 7 too will have a pH of [tex]10^{-7} \frac{mol}{L}[/tex].
The labels required by the Department of Transportation (DOT) must be placed on ________ when chemicals are being shipped. These labels may look similar to GHS pictograms and categorize hazardous chemicals into ________ different categories. The labels required by the Department of Transportation (DOT) must be placed on ________ when chemicals are being shipped. These labels may look similar to GHS pictograms and categorize hazardous chemicals into ________ different categories.
The labels required by the Department of Transportation (DOT) must be placed on outside containers when chemicals are being shipped.
These labels may look similar to GHS pictograms and categorize hazardous chemicals into nine different categories.
OSHA recently revised the Hazard Communication Standard, and as part of that modification, new standards for labeling dangerous chemicals were established.
As a result, workers will have better information available on the safe handling and use of hazardous chemicals, thereby allowing them to avoid injuries and illnesses related to exposures to hazardous chemicals.
These modifications will aid in ensuring higher standards and uniformity in the categorization and labeling of all substances.
Learn more about Hazard Communication Standard-
https://brainly.com/question/3635795
#SPJ4
By now you should realize that having an octet of electrons on a central atom is critical for a molecule to be stable. Would you expect NO and NO2 to be stable molecules
NO is a stable compound
The octet rule describes an atom's propensity to favor eight electrons in its valence shell. Atoms with fewer than eight electrons are more likely to interact with one another and create a more stable compound.
The majority of other odd-electron molecules, including NO, are highly chemically reactive and stable compounds. The second breach of the octet rule is the presence of molecules lacking electrons. Less than eight electrons are positioned around each atom in these stable compounds.
The overall molecular orbital arrangement of NO will be as follows, nitrogen has 7 electrons and oxygen has 8 electrons, according to the molecular orbital theory.
To learn more about stable compounds please visit -
https://brainly.com/question/3169343
#SPJ4
The element with the lowest melting point is: Select one: a. B b. Al c. Ga d. Tl e. All of these have the same melting point.
The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.
Melting point is usually defined as the temperature at which solid changes to liquid.
What is the order of melting point of B, Al, Ga, Tl ?The melting point order of B, Al, Ga, Tl is B > Al> Tl > Ga due to structural changes, melting point increases from Ga to Tl. Hence Ga has the lowest melting point among all these.
Thus from the above conclusion we can say that The element with the lowest melting point is Ga.
Hence, Option (C) is correct answer.
Learn more about the Melting Point here: https://brainly.com/question/40140
#SPJ4
Bonding gels and _____ are designed specifically to improve adhesion of light cured gels to the natural nail plate. glossing gels self-leveling gels gel primers building gels
Bonding gels and gel primers are designed specifically to improve adhesion of light cured gels to the natural nail plate and is therefore denoted as option C.
What is Adhesion?This is defined as the tendency of particles or substance which have dissimilar origins to stick to one another. A common adhesive is referred to as glue, cement etc and ensures there is enough resistance for their separation in case of the presence of any type of external force or stimuli acting on them.
Gel primer is referred to a vital used in makeup and serves as a form of foundation before they are applied on the skin of individuals so as to enable it stick and also look more presentable.
This is therefore the reason why gel primers was chosen as the most appropriate choice.
Read more about Adhesion here https://brainly.com/question/1451271
#SPJ1
The main constituent of gallstones is cholesterol. Cholesterol may have a role in heart attacks and blood clot formation. Its elemental percentage composition is 83.87% C, 11.99% H, and 4.14% O. It has a molecular weight of 386.64 amu. Calculate its empirical and molecular formulas.
The main constituent of gallstones is cholesterol. Cholesterol may have a role in heart attacks and blood clot formation. Its elemental percentage composition is 83.87% C, 11.99% H, and 4.14% O. It has a molecular weight of 386.64 amu. Empirical formula is C₃H₄O₁ and Molecular formula is 7(C₃H₄O₁).
What is Empirical Formula ?Empirical formula is the simplest whole number ratio of atoms present in given compound.
Element % Atomic mass Relative no. of atoms Simplest whole ratio
C 83.87 12 [tex]\frac{83.87}{12}[/tex] = 6.98 [tex]\frac{6.98}{0.25}[/tex] = 3
H 11.99 1 [tex]\frac{11.99}{1}[/tex] = 11.09 [tex]\frac{11.09}{0.25}[/tex] = 4
O 4.14 16 [tex]\frac{4.14}{16}[/tex] = 0.25 [tex]\frac{0.25}{0.25}[/tex] = 1
Thus the empirical formula is C₃H₄O₁.
How to find the Molecular formula of compound ?Molecular formula = Empirical formula × n
n = [tex]\frac{\text{Molecular weight}}{\text{Empirical formula weight}}[/tex]
= [tex]\frac{386.64}{56}[/tex]
= 7
Molecular formula = Empirical formula × n
= 7 (C₃H₄O₁)
Thus from the above conclusion we can say that The main constituent of gallstones is cholesterol. Cholesterol may have a role in heart attacks and blood clot formation. Its elemental percentage composition is 83.87% C, 11.99% H, and 4.14% O. It has a molecular weight of 386.64 amu. Empirical formula is C₃H₄O₁ and Molecular formula is 7(C₃H₄O₁).
Learn more about the Empirical Formula here: https://brainly.com/question/1603500
#SPJ4
A liquid solvent is added to a flask containing an insoluble solid. the total volume of the solid and liquid together is 81.0 ml. the liquid solvent has a mass of 40.5 g and a density of 0.865 g/ml. determine the mass of the solid given its density is 2.25 g/ml.
The mass of solid is 76.905 g.
Given that,
Total volume of solid and liquid = 81.0 mL
Mass of liquid = 40.5 g
Density of liquid = 0.865 g/mL
Density of solid = 2..25 g/mL
We need to calculate the volume of liquid
Using formula of density
[tex]Density = Mass/volume(V_{l} } )\\\\volume(V_{l} )=Mass/Density[/tex]
Put the value into the formula
[tex]V_{l} = 40.5/0.865\\\\V_{l} = 46.82 mL[/tex]
We need to calculate the volume of solid
Volume of solid = Total volume of solid and liquid- volume of liquid
[tex]V_{s} =81.0-46.82\\\\V_{s} =34.18 mL[/tex]
We need to calculate the mass of solid
[tex]P_{s}=M_{s} /V_{s} \\\\M_{s} =P_{s}V_{s}[/tex]
Using formula of density
Put the value into the formula
[tex]M_{s}=2.25 X 34.18\\\\M_{s}=76.905 g[/tex]
Hence, The mass of solid is 76.905 g.
What is density?A substance's density (more accurately, its volumetric mass density; sometimes known as specific mass) is its mass per unit volume. The most common symbol for density is (the lower case Greek letter rho).
There are three types of Density:
linear densitybulk densityarea densityLearn more about density :
https://brainly.com/question/21461758?referrer=searchResults
#SPJ4
How many moles of electrons are transferred when the two half-reactions shown below are combined to generate the spontaneous balanced chemical reaction with the lowest possible integer coefficients
6 moles of e- are transferred when the two half-reactions shown below are combined to generate the spontaneous reaction with the lowest possible integer coefficients
A spontaneous reaction is one that favors the creation of products under the reaction's current conditions. A bonfire that is raging and exothermic is an illustration of a spontaneous reaction (there is a decrease in the energy of the system as energy is released to the surroundings as heat)
A redox reaction's oxidation or reduction reaction component is known as a half-reaction (or half-cell reaction). By taking into account the shift in oxidation states of the many chemicals participating in the redox reaction, a half-reaction is obtained. At each electrode, there are two chemical reactions taking on in the cell. Half-reactions are what we refer to as. An oxidation reaction that releases electrons occurs at the anode.
To learn more about Spontaneous reaction please visit -
https://brainly.com/question/13790391
#SPJ4
Which statements describe some of the original ideas proposed about the universe during the big bang? Check all that apply.
The statements which describe some of the original ideas proposed about the universe during the big bang include:
The universe was opaque. The universe was very dense and hot. The universe expanded from a single point. What is Big bang theory?This theory describes how the universe expanded from a single point to form the earth we are living in.
it states that the very dense and hot environment led to it thereby making it the most appropriate choice.
Read more about Big bang theory here https://brainly.com/question/6841128
#SPJ1
Help!!
Classify each diagram as an element a compound or mixture
Answer:
1. Mixture
2. Compound
3. Compound
4. Element
Explanation:
Number 1 shows two completely different types of compounds in the same space, so it is a mixture.
Numbers 2 and 3 are compounds because there aren't different types compounds as in Number 1, but the same compound repeated. 2 is a compound because while all of the circles are the same element, they are connected. O2 for example, oxygen, is a compound.
Number 4, finally, is all of the same substance, non-connected, so it shows an element.
Brainliest, please :) (Trying to become a genius so that I can continue helping more people)
Part 1. A chemist reacted 12.0 liters of F2 gas with NaCl in the laboratory to form Cl2 gas and NaF. Use the ideal gas law equation to determine the mass of NaCl that reacted with F2 at 280. K and 1.50 atm.
F2 + 2NaCl → Cl2 + 2NaF
Part 2. Explain how you would determine the mass of sodium chloride that can react with the same volume of fluorine gas at STP.
The mass of NaCl that reacted with 12 lit of F2 at 280 K and 1.50 atm= 0.027 gm.
the mass of sodium chloride that can react with the same volume of fluorine gas at STP = 0.01 gm.
Given,
F2 + 2NaCl → Cl2 + 2NaF
PART-1:
So, from the given reaction we can say that 2 moles of NaCl is required for 1 mole of F2.
By using combined gas law,
[tex]\frac{P1V1}{n1T1} =\frac{P2V2}{n2T2}[/tex]
here , P1 =P2
and moles of NaCl is twice as pf F2
∴n2=2n1
and also T1 = T2
by simplifying the reaction we get..
[tex]\frac{V1}{n1} = \frac{V2}{2n1}[/tex]
V2= 2 × V1
∴V2 = 2 ×12
= 24 Lit.
from ideal gas law ,
we can find the moles of NaCl,
PV= nRT
n=[tex]\frac{PV}{RT}[/tex]
n= 1.5 × 24 ÷( 0.082 × 280)
∴ n= 1.57
mole = mass / molecular mass
so, molecular mass of NaCl = 58.5
∴ mass of NaCl used = 1.57/58.5
= 0.027 gm
PART -2:
At, STP
T= 273 K
P = 1atm
V= 12 lit
n= ?
using ideal gas law we can determine the number of moles
PV= nRT
n = 1 ×12 ÷(0.082 × 273)
n= 0. 54
∴ mass of NaCl = 0.54 / 58.5
= 0.01 g
Learn more about molar mass here...
https://brainly.com/question/837939
#SPJ1
Answer: for part 1: our equation is F2 + 2NaCI -> CI2 + 2NaF. We can solve this by using the gas law(s). The ideal gas law is PV = nRT. P = pressure V = volume n = amount of substance R = ideal gas constant and T = temperature. We know that 2 moles of NaCI is crucial for 1 mole of F2. P1=P2 and T1=T2. we multiply the 12 liters by 2. which is 24 liters. We know NaCI consists 58.44/58.5g per mole. if we divide that by n of (nRT) we find the mass. we mutiply 24 by 1.5. which is 36 the divide by 0.082 which was multiplied by 280. and u get 1.567 or 1.57. we divide that by the g of NaCI. u get 0.027.
for part 2: we STP stands for Standard Temperature and Pressure. we can also use the ideal gas law. PV = nRT. Using this knowledge we can determine the mass. T is 273k and p is 1 atm. v is 12. we multiply 0.082 and 273. 22.386. we divid that by 12. we get 0.54. then we divide the 0.54 by the g again. which is 0.01g.
Explanation:
Which image best represents a solution of distilled water at pH = 7?
Answer:
nuetral
Explanation:
water has neutral
The isotope 226Ra has a half-life for radioactive decay of 1600 Y. How long will it take the amount of 226 Ra in a sample of 226RaCl2 to decrease by 25%
The population that experienced the highest radioactivity from chernobyl in norway were:______
The population that experienced the highest radioactivity from chernobyl in norway were "a small community of reindeer herders called the Saami".
Typically, the term "population" denotes the total quantity of people living in a particular area, be it a city or town, region, country, continent, or even the entire world.
The native reindeer herders of Scandinavia could be known as the Sámi. These breathtaking images capture a herd during its yearly journey through summer pastures as well as wintering areas.
Therefore, the population that experienced the highest radioactivity from chernobyl in norway were "a small community of reindeer herders called the Saami".
To know more about population
https://brainly.com/question/27991860
#SPJ4
A coupled reaction is a pair of reactions occurring together in which the energy released by one reaction is used in bond formation in the second reaction. For example, glycolysis and pyruvate processing form a coupled reaction. Explain how coupling reactions allows a cell to capture the free energy of glucose oxidation rath
A coupled reaction is a pair of reactions occurring together in which the energy released by one reaction is used in bond formation in the second reaction. For example, glycolysis and pyruvate processing form a coupled reaction.
Chemical reactions that involve a common intermediate and the transfer of energy from one side to the other are referred to as coupled reactions. An illustration is the endergonic process of ATP synthesis, which is connected to proton gradient dissipation.
High-energy phosphate bonds are broken during the hydrolysis of an ATP molecule, which releases a lot of energy into the exergonic form. The coupled reaction is crucial in the transformation of this energy into an endergonic state. Coupled reactions are those that occur when two separate reactions are driven by the free energy released during the first reaction.
To learn more about coupled reactions please visit -
https://brainly.com/question/14989703
#SPJ4
In a titration of a monoprotic weak acid with sodium hydroxide, the ph at the half-equivalence point is 4. 20. What is the experimental ka value of this acid?.
Ka value of monoprotic weak acid:
The experimental ka value of this acid is 6.3 × [tex]10^{-5}[/tex]
Half-equivalence point:
The pH of the solution will be equal to the pKa of the weak acid at the half-equivalence point.At the equivalence point, the strong base OH- will neutralize the weak acid in the case of a weak monoprotic acid, which I'll denote as HA.HA + OH⁻ → A⁻ + H₂OThe moles of OH are equivalent to the moles of the acid since the acid is monoprotic:
At half equivalence point, pH = pKₐ
The pKa is determined by the weak acid's Ka acid dissociation constant.
pKₐ = -log(Kₐ)
Kₐ = [tex]10^{-pKa}[/tex]
At the half equivalence point,
Kₐ = [tex]10^{-pH}[/tex]
Given,
pH = 4.20. By putting the value;
Kₐ = [tex]10^{-4.20}[/tex]
= 6.3 × [tex]10^{-5}[/tex]
Learn more about the monoprotic weak acid here,
https://brainly.com/question/14365346
#SPJ4
The equilibrium constant for the reaction shown here is Kc=5.0×102. A reaction mixture at equilibrium contains [A]=1.0×10−3M. What is the concentration for the B mixture?
A(g)⇌B(g)
Here are the choices:
A. 1.0×10−3M
B. 5.0×102M
C. 1.0 M
D. 0.50 M
D. The concentration for the B mixture is 0.5 M.
concentration for the B mixturekc = [B]/[A]
where;
kc is equilibrium constantA is the concentration for the A mixtureB is the concentration for the B mixtureB = kc(A)
B = (5x 10²)(1 x 10⁻³)
B = 0.5 M
Thus, the concentration for the B mixture is 0.5 M.
Learn more about concentration here: https://brainly.com/question/17206790
#SPJ1
Give the coordination number and the charge of the central metal ion in each coordination compound: For the charges, enter your answers with the correct sign. e.g. if you think the answer is 1, enter the positive sign followed by the number 1. Na2[Zn(OH)4] coordination number
The coordination number shows the number of ligands attached to the central metal.
What is complex in coordination compound?A coordination complex is the product of a Lewis acid-base reaction in which neutral molecules or anions (called ligands) bond to a central metal atom (or ion) by coordinate covalent bonds. Ligands are Lewis bases - they contain at least one pair of electrons to donate to a metal atom/ion.A complex is a coordination compound which contains a central metal atom or ion. The coordination number refers to the number of ligands in the complex. The coordination number usually influences the geometry of the complex compound.The coordination number and the charge on the central metal in each of the complexes are shown below;
Na2[Zn(OH)4] - The coordination number of the complex is 4 and the charge on the central metal ion is +2.
Learn more about coordination number
brainly.com/question/27289242
#SPJ4
How many moles of helium are in a
45.0 liter tank at 293 K and 15.0 atm?
Answer:
28.1 moles (three sig digits)
Explanation:
Using Ideal Gas Law
PV = n RT looking for 'n' R = .082057366 L-atm/K-mole
15.0 * 45.0 = n * .082057366 * 293
n = 28.1 Moles
The number of moles of helium that are in a 45.0-liter tank at 293 K and 15.0 atm is 28.1 Moles.
What are moles?Moles is the measuring unit that measures the quantity of a substance. Moles is a SI unit.
Helium is the lightest gas, which is used in the tires of an airplane if it is filled in the balloons, the balloon flies in the sky.
Given the volume is 45.0 liter
The pressure is 15.0 atm.
The temperature is 293 K
To calculate the moles, we will use the formula of an ideal gas:
PV = n RT
R = .082057366 is the gas constant.
We have to calculate the n
Putting the values in the equation
15.0 x 45.0 = n x .082057366 x 293
n = 28.1 Moles.
Thus, the moles of helium is n = 28.1 Moles.
Learn more about moles, here:
https://brainly.com/question/26416088
#SPJ5
John has been feeling ill all day. He arrives home from work and takes his temperature. Unfortunately, the thermometer shows his temperature in Celsius, and he can’t get it to change. It reads 40 degrees Celsius. What is his temperature in Fahrenheit?
Answer:
[tex]40 \times 1.8 + 32 = 104[/tex]Explanation:
The best way to change Celsius to Fahrenheit is to times it by 1.8 then plus 32
Positron emission tomography (pet) imaging relies upon the emission of __________ from radioactive isotopes such as carbon-11.
Answer:
positron
Explanation:
PET scanning works by injecting a radioactive material, called a tracer, into the body. The tracer emits a positron inside the body, and the positron collides with electrons in the body, thereby annihilating and releasing two gamma rays that travel in opposite directions.
Determine the limiting reagent in the following equation for the production of salt and determine the amount of NaCl produced and the mass of excess reagent. (I - 10 marks)
100g 100g
NaHCO3 + HCl —> NaCl + H2O + CO2
Answer:
Limiting Reagent: NaHCO₃
Amount of NaCl: 69.6 g NaCl
Mass of Excess Reagent: 56.6 g HCl
Explanation:
To find the mass of NaCl, you need to (1) convert mass reactant to moles reactant (via molar mass), then (2) convert moles reactant to moles NaCl (via mole-to-mole ratio from equation coefficients), and then (3) convert moles NaCl to mass NaCl (via molar mass).
Molar Mass (NaHCO₃):
22.990 g/mol + 1.008 g/mol + 12.011 g/mol + 3(15.998 g/mol)
Molar Mass (NaHCO₃): 84.003 g/mol
Molar Mass (HCl): 1.008 g/mol + 35.453 g/mol
Molar Mass (HCl): 36.461 g/mol
Molar Mass (NaCl): 22.990 g/mol + 35.453 g/mol
Molar Mass (NaCl): 58.443 g/mol
100 g NaHCO₃ 1 mole 1 mole NaCl 58.443 g
------------------------ x ------------------ x --------------------------- x ---------------- =
84.003 g 1 mole NaHCO₃ 1 mole
= 69.6 g NaCl
100 g HCl 1 mole 1 mole NaCl 58.443 g
---------------- x ------------------ x ----------------------- x ---------------- =
36.461 g 1 mole HCl 1 mole
= 160 g NaCl
Since NaHCO₃ results in the smaller amount of product, it is the limiting reagent. In other words, it is used up before the HCl has the chance to completely react. Therefore, the actual amount of NaCl produced is 69.6 grams.
To find the mass of the excess reagent, you need to calculate the amount of HCl actually used in the reaction. Then, you need to subtract that value from the total amount of HCl.
69.6 g NaCl 1 mole 1 mole HCl 36.461 g
--------------------- x ------------------ x ----------------------- x ---------------- =
58.443 g 1 mole NaCl 1 mole
= 43.4 g HCl
Amount Given - Amount Reacted = Mass Excess
100 g HCl - 43.4 g HCl = 56.6 g HCl