The molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
How to calculate molecular formula?The molecular formula can be calculated from the empirical formula. The empirical formula of the compound is calculated as follows:
C = 38.7% = 38.7gH = 9.76% = 9.76gO = 51.5% = 51.5gNext, we convert the mass to moles by dividing by their atomic mass:
C = 38.7 ÷ 12 = 3.23molH = 9.76 ÷ 1 = 9.76molO = 51.5÷ 16 = 3.22molNext, we divide by the smallest (3.22)
C = 1H = 3O = 1Hence, the empirical formula of the compound is CH3O
If the molar mass of the compound is 62g/mol;
(CH3O)n = 62
31n = 62
n = 2
(CH3O)2 = C2H6O2
Therefore, the molecular formula of the compound that has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen is C2H6O2.
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Why do different elements produce distinct colors in the flame test
Answer:
Their electrons have different allowed energy levels
Explanation:
Elements are the pure form that only consists of the atoms of the same proton number. Distinct colors are produced in the flame test as their electrons have different energy levels.
What is the Flame test?A flame test is a procedure that detects the presence of chemical substances based on a spectrum and colors emitted by the elements in the flame.
The energy levels of the different elements vary and are defined by the movement of the electrons in the spectra. The energy released and the flame produced by different electrons are different.
Therefore, electrons with various energy levels release flames of different colors.
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what happens to a cell placed in an isotonic solution
Answer:
The cell's volume will remain stable.
Explanation:
If a cell is placed in an isotonic solution, there will be no net flow of water into or out of the cell, and the cell's volume will remain stable. If the solute concentration outside the cell is the same as inside the cell, and the solutes cannot cross the membrane, then that solution is isotonic to the cell.
How is a double displacement reaction completed and balanced
A double displacement reaction is a type of reaction in which two reactants exchange ions to form two new compounds. Many double displacement reactions occur between ionic compounds that are dissolved in water. A double replacement reaction is represented by the general equation.
In what container can you not see the meniscus
Answer:
Measure so that the line you are reading is even with the center of the meniscus. For water and most liquids, this is the bottom of the meniscus. For mercury, take the measurement from the top of the meniscus. In either case, you are measuring based on the center of the meniscus.
Explanation:
Draw the structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene. Show all formal charges
The 2,4 and 5 positions are accessible for nitration of 1,3‑dimethylbenzene. The final product is shown in the image attached.
What is nitration?Nitration is a type of reaction in which the nitro group (-NO2) is introduced to an aromatic ring. We have to note that in the compound 1,3‑dimethylbenzene, the 2,4 and 5 positions are accessible for nitration as shown.
Hence, the nitration of 1,3‑dimethylbenzene occurs as shown in the image attached with the compound shown being the major product.
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The structure of the major nitration product from the reaction of nitric acid with 1,3‑dimethylbenzene is shown in attached image.
What is nitration?Nitration is a process in which addition of nitro group (-NO₂) is taking place on the substrate molecule.
In the given question 1,3‑dimethylbenzene is the susbtarte in which nitration will be done in the presence of sulphuric acid (H₂SO₄) and nitric acid (HNO₃). Methyl groups which are present in the substrate molecule will behave as an ortho para directing groups as they are electron donating groups. So the major product obtained in the reaction is shown below in image.
Hence the structure of major nitration product is shown below in image.
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100 points
In an equilibrium expression, the concentrations of ___ are on top.
A:products B:solids C:reactants D:liquids
Answer:
products, it's answer A.
Answer:
products
Explanation:
Using standard thermodynamic data at 298k, calculate the free energy change when 2. 34 moles of nh3(g) react at standard conditions
For a thermodynamic data at 298k, when 2. 34 moles of nh3(g) react at standard conditions, the free energy change is mathematically given as
dG'−213.174KJ
What is the free energy change?Generally, the equation for the Chemical Reaction is mathematically given as
HCL+NH3----->NH4Cl
Therefore
dG=-202.9-[-16.5+(95.3)]
dG=-91.1KJ/mol
In conclusion, For 2.34 moles
dG'=-91.1KJ/mol*2.34
dG'−213.174KJ
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The free energy change when 2.34 moles of NH₃(g) react at standard conditions is -213.174 kJ.
How do we calculate free energy change?Free energy change of any chemical reaction will be calculated by using the following chemical reaction:
ΔG = Free energy of products - Free energy of reactants
Given chemical reaction is:
NH₃ + HCl → NH₄Cl
From the stoichiometry of the reaction it is clear that same moles of ammonium chloride is produced by the same moles of ammonia & hydrochloric acid.
Free enrgy of NH₄Cl = -202.9 kJ/mol
Free enrgy of NH₃ = -16.5 kJ/mol
Free enrgy of HCl = 95.3 kJ/mol
On putting values in the above equation, we get
ΔG = -202.9-[-16.5+(95.3)]
ΔG = -91.1KJ/mol
For 2.34 moles, ΔG will be:
ΔG = (2.34)(-91.1) = -213.174 kJ
Hence required amount of free eenrgy is -213.174 kJ.
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What does that mean about the densities of the phases of water?.
Answer:
The solid state is the most dense, followed by the liquid state, then the gas state. The solid state is more dense than the liquid state.
Explanation:
Does this answer your question???
A neutral cloth and a neutral rod are rubbed together. Electrons are transferred from the rod to the cloth. What will be the final charge on the cloth?
Answer: The net charge on the cloth with be negative.
Explanation:
Because electrons are being transferred from the neutral rod to the neutral rod to the neutral cloth, the cloth will become negative due to the excess electrons. (The rod will also become positively charged, but that’s beyond the scope of the question.)
When a neutral cloth and a neutral rod are rubbed together then the final charge on the cloth is negative.
What is transfer of charge from material ?Whenever electrons are transferred between objects, neutral matter becomes charged. For example, when atoms lose or gain electrons they become charged particles called ions. Three ways electrons can be transferred in a material that are conduction, friction, and polarization.
How does the charge transfer from rod to the cloth ?Rubbing a neutral rod with a neutral cloth also transfer charge from both the material. We know that a metal rod is a conductor of electricity whereas the cloth is an insulator that does not conduct electricity. When both the rod and cloth is rubbed, electrons are transferred due to friction on the material. Electrons are always negatively charged. As the rod and cloth is rubbed, the electrons flow from the rod to the cloth thereby making the rod as positively charged and the cloth as negatively charged.
Thus, when a neutral cloth and a neutral rod are rubbed together then the final charge on the cloth is negative.
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During Taylor's second test of a car with a mass of 200 grams, she recorded 11 seconds, 11.4 seconds, and 11.2 seconds for her 3 trials. What would be the mean value she would use to compare with the other cars?
11 seconds
33.6 seconds
11.2 seconds
11.53 seconds
Answer:
the answer is 11.2 seconds. I listened to the other person and picked 33.6 but that was wrong.
Explanation:
took test
3. What is the hydrogen ion concentration of a solution with a pH of 2.0?
Answer:
[H+] = 10^-2
Explanation:
pH = -log[H+]
2 = -log[H+]
[H+] = 10^-2
Identifying balanced and unbalanced forces
Identify the situations that have an u balanced force. Check all that apply
A baseball speeds up as if it falls through the air
A soccer ball is at rest on the ground
An ice skater glides in a she ighr like at a constant speed
A bumper car hit by another car moves off an angle
A bin goes across the room when the air is released
When 55.8 g of Fe reacts with Cl2 according to the equation 2Fe + 3Cl2 --> 2FeCl3. How many moles of Cl2 are required to react with all the iron?
2.00 mol
1.00 mol
0.67 mol
1.50 mol
Answer:
1.50 moles
Balanced equation: 2Fe + 3Cl₂ --> 2FeCl₃
find moles of iron:
moles = mass/Mr
moles = 55.8/56
moles = 0.9964 moles
use molar ratio:
2Fe : 3Cl₂
2 : 3
moles of Cl₂ = (0.9964/2)*3 = 1.50 moles
What is true of a sample of gas as temperature is increased? (3 points)
As temperature increases, the average kinetic energy of a sample of gas molecules decreases.
Which compound has the empirical formula with the greatest mass?
A.
C2H6
B.
C4H10
C.
C5H10
D.
C6H6
B. C4H10
Butane is a straight chain alkane composed of 4 carbon atoms. It has a role as a food propellant and a refrigerant. It is a gas molecular entity and an alkane.
Mass of C2H6 = 30.07 g/mol
Mass of C4H10 = 58.1222 g/mol
Mass of C5H10 = 70.1329 g/mol
Mass of C6H6 = 78.11184 g/mol
The mass of the empirical formula C6H6 is the greatest of all other compounds.
What is Molar mass?A chemical compound's molar mass is calculated by dividing its mass by the number of moles—measured in moles—that make up the sample of that compound. A substance's overall characteristics include its molar mass. The compound is present in many different forms, each with a different mass as a result of the isotopes. The molar mass is the average of these masses. The molar mass is most frequently calculated using the standard atomic weights and is a function of the relative abundance of the constituent atoms' isotopes on Earth. It is thus a terrestrial average. For converting between a substance's mass and its amount for large quantities, use the molar mass.To learn more about Molar mass, refer to:
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Which staternent about all the noble gases is correct?
A The number of protons in the atoms equals the number of neutrons.
B Their atoms each have a stable arrangement of electrons.
C Their atoms each have eight electrons in their outer shell
D They exist as molecules containing two atoms.
Answer:
B
Explanation:
The electrons in all noble gases are filled with electrons and don't need to involve in a reaction to gain or loss
The answer A is wrong because not all of them has same number of protons equal the neutrons
Answer C is wrong because we can see helium with 2 electrons in outer shell
and Answer D is wrong as we say above each atom doesn't need to react with another to be stable
How many Oxygen atoms are there in 2MgSO4?
Answer:
8
Explanation:
2MgSO4
We see there are 4 atoms, but these are multiplied by 2, therefore 8 atoms of oxygen.
Answer:
it is 4.
Explanation:
four atoms of oxygen (O)
four atoms of silicon (Si)
two atoms of magnesium (Mg)
two atoms of oxygen (O)
Balance the chemical equation
Balanced equation: 2 HI --> I2 + H2
Explanation:
HI-
H = 1 x 2 = 2
I = 1 x 2 = 2
H2-
H = 2
I = 2
What property did mendeleev use to organize the periodic table.
Answer:
Atomic weight.
Explanation:
Hope this helps you!
what determines the role of an organism in an ecosystem?
Answer:
An organism's role within an ecosystem depends on how it obtains its food. Plants and animals obtain their food in very different ways, so they have very different roles in an ecosystem. The way in which an organism obtains food also affects its interactions with other organisms in the ecosystem.
Explanation:
Need help ASAP. Thank you
Answer:
Circuit 1 = ?
Circuit 2 = Parallel
Explanation:
Since circuit 1 isn't shown on the picture, it's probably a series circuit, but if circuit 1 is a box with symbols around it, then it's a series circuit. But if it has three or more horizontal lines/cables like circuit 2, then it's a parallel circuit - circuit 2 has a second horizontal line with an open switch and lamp.
Circuit 2 is a parallel circuit, as it has branches/horizontal lines (that were explained in the paragraph above).
Why agar is used as a solidifying agent in culture media instead of gelatin
Agar is used as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.
What is agar?Agar is a gelatinous material obtained from red algae and used in the preparation of culture medium.
Agar is used to solidify the culture medium for bacteria growth, although, gelatin can also be used.
However, agar is preferred as a solidifying agent in culture media instead of gelatin because it readily melts and it contains no nutrition for bacteria cultures.
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hello people ~
According to Robert Boyle, which of the following is not an acid’s property?
a) turns blue Litmus red
b) sour in taste
c) neutralize bases
d) bitter in taste
Answer:
Bitter in taste
Explanation:
Acids according to Robert Boyle taste sour not bitter.
They are corrosiveThey can act as neutralize basesAccording to Robert Boyle, the option which is not an acid’s property include the following: d) bitter in taste.
What is an acidic solution?In Chemistry, an acidic solution can be defined as a type of aqueous solution that has a high concentration of hydrogen ions (H⁺), which is typically greater than that of pure water.
According to Robert Boyle, the properties of acids include the following:
They turn a blue Litmus paper red.
They are corrosive
They can act as neutralize bases.
They are sour in taste
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compound has a percent composition of 38.7% carbon, 9.76% hydrogen, 51.5% oxygen.
Laboratory data shows that the compound's molar mass is 62.0 g/mol. What is the
molecular formula of the compound?
The molecular formula for a compound with a percent composition of 38.7% C, 9.76% H, 51.5% O, and a molar mass of 62.0 g/mol is C₂H₆O₂.
What is a molecular formula?A molecular formula is a chemical formula indicating the kinds and number of atoms of each kind in a molecule of a compound.
To determine the molecular formula, we need to follow a series of steps.
Step 1. Divide the percentage of each element by its molar mass.C: 38.7/12.01 = 3.22
H: 9.76/1.01 = 9.66
O: 51.5/16.00 = 3.22
Step 2. Divide all the numbers by the smallest one, i.e. 3.22.C: 3.22/3.22 = 1
H: 9.76/3.22 = 3
O: 3.22/3.22 = 1
The empirical formula is CH₃O and its molar mass is 31.04 g/mol.
Step 3. Determine the molecular formula.First, we will calculate how many times the empirical formula is contained in the molecular formula by dividing their molar masses.
n = (62.0 g/mol) / (31.04 g/mol) = 2
The molecular formula is 2 times the empirical formula, that is, C₂H₆O₂.
The molecular formula for a compound with a percent composition of 38.7% C, 9.76% H, 51.5% O, and a molar mass of 62.0 g/mol is C₂H₆O₂.
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Can somebody please help write a short paragraph about this including all the words listed in the question. Thanks!
WILL MARK BRAINLIEST WHOEVER CAN ANSWER FIRST!!! :DDDD
Answer:
Vaccines work by stimulating your immune system to produce antibodies, exactly like it would if you were exposed to the disease. After getting vaccinated, you develop immunity to that disease, without having to get the disease first.
What is the best definition of the enthalpy of formation, A HA?
A. The energy released when products form in a reaction
B. The energy absorbed when products form in a reaction
C. The energy required for a molecule to form from its elements
D. The energy required for an atom to form from its subatomic
particles
Answer:
I guess the answer ia point A
How many moles are in 79.85 g of Iron (III) oxide?
Answer:
For Fe, it's 55.845 g/mol. So 7.85 / 55.845 = 0.141 mol.
Balanced equation for formation of potassium suberate from cyclooctene
The balanced equations for the formation of potassium suberate from cyclooctene are;
3KMnO4 + 3C8H18 + 4H2O --> 3C8H17(OH)2 + 2MnO2 + 2KOH and
3C8H14(OH)2 + 6KMnO4 ----> 3KCOO(CH2)6 COOK + 6MnO2 + 6H20
What is potassium suberate ?
The compound potassium suberate is obtained from cyclooctene. The first step in the process is the oxidation of cyclooctene using potassium permanganate as follows;
3KMnO4 + 3C8H18 + 4H2O --> 3C8H17(OH)2 + 2MnO2 + 2KOH
This is followed by the production of potassium suberate from the reaction equation;
3C8H14(OH)2 + 6KMnO4 ----> 3KCOO(CH2)6 COOK + 6MnO2 + 6H20
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Balanced chemical equation for the formation of potassium suberate from the cyclooctene is 3KMnO₄+3C₈H₁₈+4H₂O→3C₈H₁₇(OH)₂+2MnO₂+2KOH &
3C₈H₁₄(OH)₂+6KMnO₄→3KCOO(CH₂)₆COOK+6MnO₂+6H₂O
What is balanced equation?Those equation in which number of each entities present on both sids of the given chemical equation is same is known as balanced equation.
Formation of potassium suberate from the cyclooctene will be complete in following two steps:
(1). In first step oxidation of cyclooctene is done by using potassium permanganate.
3KMnO₄ + 3C₈H₁₈ + 4H₂O → 3C₈H₁₇(OH)₂ + 2MnO₂ + 2KOH
(2). In the second step final product is obtained as a result of the oxidation as.
3C₈H₁₄(OH)₂ + 6KMnO₄ → 3KCOO(CH₂)₆COOK + 6MnO₂ + 6H₂O
Hence the balanced chemical reaction for the formation of potassium suberate is discussed above.
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Calculate the number of moles when 3.00l of a gas at 814 mmhg and 25 °c?
So
No of moles=n
[tex]\\ \rm\rightarrowtail PV=nRT[/tex]
[tex]\\ \rm\rightarrowtail n=\dfrac{PV}{RT}[/tex]
[tex]\\ \rm\rightarrowtail n=\dfrac{814(3)}{25R}[/tex]
[tex]\\ \rm\rightarrowtail n=2442/25R[/tex]
[tex]\\ \rm\rightarrowtail n=97.7Rmol[/tex]
Scientific laws commonly answer which questions about the world?
1. Why?
2. How?
3. How many?
4. What?
Answer:
How
Explanation: In science a person has to be curious on how things work. Key word how. Why makes sense but how is the better answer. How many is a specific question. But it doesn't involve the whole spectrum of science. What also doesn't make sense.
A scientific law is a proposition that states what consistently takes place under specific circumstances. The law of conservation of mass and the law of conservation of energy are two other examples of physical science laws. The correct option is 2.
A scientific law only describes an occurrence in the natural world; it makes no attempt to explain how it happens. It is only the outcome of several observations and is supported by empirical evidence.
The definition of a naturally occurring phenomenon in the world is scientific law. It clarifies how something occurs. Equations or formulas in mathematics are used to express laws.
Thus the correct option is 2.
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