The dialysis tube was placed in a solution with a higher concentration of solutes than the 97% water solution inside the tube.
What is solution?Solution is a way of resolving a problem or addressing an issue. It often involves identifying the underlying cause of the issue and then coming up with a plan that can be implemented to address the problem. Solutions may involve simple steps, such as changing a behavior, or they may involve more complicated processes that require multiple steps, such as creating new policies or procedures. Solutions should be designed to be effective, sustainable, and measurable.
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Determine the number of atoms of each element in the following: 4Al(OH)3
symbol
aluminium - Al 4
oxygen- o 12
hydrogen- H 12
What is the total number of moles contained in 115 grams
of C₂H5OH?
A. 1.00
B. 1.50
C. 2.50
D. 3.00
The total number of moles contained in 115 grams of C₂H5OH is 2.50 moles .
What is the term "mole"?The term "mole" refers to the quantity of a substance that has the same amount of subatomic particles (ions, molecules, or atoms) as there are carbon atoms.
Atomic weight of carbon(C)= 12 gm
Atomic weight of Hydrogen (H)=1 gm
Atomic weight of oxygen (o)=16 gm
∴Molecula weight of C2H5OH =(12×2 + 1×6 + 16×1) gm
24 + 6 + 16 gm = 46 gm
∴ 46 gm of C2H5OH contains 1 mole
1 gm of C2H5OH contain = 1/46 moles
115 gm of C2H5OH contains = 115×1/46 moles
⇒2.5 moles
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Step 2: measure the area of the top of the syringe
The top of the syringe is a circle. You need to compute area for use in lead to computations of pressure valves. Start by using a ruler to measure the diameter. Estimate to the nearest. 1 cm
3. 60 cm
Divided by two to find the radius. Maintain significant figures
1. 80 cm
Substitute the radius into the formula pie r 2 To find the area of the top of the syringe. Maintain significant figures
10. 2 cm
The syringes' circle measures area 10.17 square inches.
The area of a circle is the area that a circle occupies on a two-dimensional plane. The region contained by the circle's radius or perimeter is another way to define the circle's area. The circle's radius, or r, is equal to its diameter in half.
The diameter given is 3.60cmThe radius given is 1.80cmWe need to calculate the area of the circle
You may determine the circle's surface area via
Change the formula's value for r.
Area of circle =π[tex]r^{2}[/tex]
Area of circle =3.14[tex]\times[/tex]1.80[tex]\times[/tex]1.80
Area of circle =10.17 [tex]cm^{2}[/tex]
Hence the area of the Circle is 10.17[tex]cm^{2}[/tex]
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Malachite is a green colored mineral that is 57.5% copper. What mass of copper is present in a 250.0 g sample of malachite
57.5% Cu2(CO3)(OH) (OH) Other elements are also present in addition to copper.
To get the mass percent of copper in malachite (Cu2(OH)2CO3), apply the following formula:
Malachite (Cu2(OH)2CO3) has a molar mass of 2x63.5% + 2(16+1) + 12 + (16x3) = 127 + 2(17) + 12 + 48 = 127 + 34 + 12 + 48 = 221g/mol.
Cu2(OH)2CO3 has a Cu mass of 2 x 63.5g, or 127g.
The mass-based fraction of Cu in Cu2(OH)2CO3 is calculated as Cu2(OH)2CO3 mass per mol mass multiplied by 100 = 127/221 x 100 = 57.5%.
Malachite Cu2(OH)2CO3 has 57.5% of its mass in copper.
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Suppose you run this reaction in a solvent that dissolves elemental mercury and elemental oxygen. What is the equilibrium-constant expression in terms of molarities for the reaction, using (solv) to indicate solvation.
At 55 °C, the equilibrium constant for this reaction is 6.68. A pharmaceutical chemist prepares 15.0 L of an initial 0.275 M acetic acid and 3.85 M ethanol solution.
Create an equation that can be solved for x by plugging the equilibrium concentrations (expressed in terms of x) into the formula for the equilibrium constant. (d) The equation from subpart (c) is cubic (it bears the formula ax3 + bx2 + cx + d = 0). In general, it is impossible to solve cubic equations in closed form. Indicate the direction (toward product or toward reactants) in which the mixture must change if it is not at equilibrium. The concentrations of SO 2 Cl 2 and SO 2 are 0.108 M and 0.052 M, respectively, in a mixture of the three gases that has reached equilibrium.
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What are the electron and molecular geometries, respectively, for iodine trifluoride, IF3? Electron geometry is trigonal bipyramidal. Molecular geometry is trigonal planar. Electron geometry is trigonal bipyramidal. Molecular geometry is T-shaped. Electron geometry is octahedral. Molecular geometry is T-shaped. Electron geometry is trigonal planar. Molecular geometry is trigonal bipyramidal.
Electron geometry is trigonal bipyramidal. Molecular geometry is T-shaped for iodine trifluoride, IF3.
Trifluoroiodine, often known as iodine trifluoride, has the chemical formula IF3. It is an unstable interhalogen chemical molecule. It has a yellow solid appearance and easily breaks down at temperatures higher than -28°C. Because of IF3's fragility, it is mostly unknown and undiscussed in the scientific community.In light of all of the aforementioned information, this article provides you with a basic introduction to IF3, covering topics such as how to draw its Lewis structure, molecular geometry, or shape of IF3, electron geometry, bond angle, hybridization, polar or non-polar nature, and/or any formal charges present on IF3 atoms.
Complete question:6. What are the electron and molecular geometries, respectively, for iodine trifluoride, IF3?
A. Electron geometry is trigonal bipyramidal.Molecular geometry is T-shaped.
B. Electron geometry is octahedral.Molecular geometry is T-shaped.
C. Electron geometry is trigonal bipyramidal.Molecular geometry is trigonal planar.
D. Electron geometry is trigonal planar.Molecular geometry is trigonal bipyramidal.
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Answer:
The electron geometry of IF3 is trigonal bipyramidal. But the molecular shape of IF3 is T-shaped. The bond angles formed between each atom are close to 90 degrees.
Explanation:
what kind of information does this map show
Answer: C(Elevation of surface features)
Explanation: It's a topographical Map which displays lines of Equal Elevation.
A compound is composed of carbon and hydrogen and has an empirical
formula of CH. The molar mass of the compound is experimentally
determined to be 78.12 g/mol. What is the molecular formula for the
compound?
The empirical formula for the given compound is C6H6.
What is empirical formula?The molecular formula represents the precise digits of the atoms found in the given molecule of the compound, whereas the empirical formula represents the proportional of the atoms found in the provided compound.
How empirical formula calculated?The empirical formula defines the individual atoms that make up a species in the simplest whole number ratio possible. The
The empirical formula is always multiplied by the molecular formula.
Given the foregoing, the empirical formula for the molecular formula is n.
Because of this, the molecular formula is: 78.0 g m o l 1 = n ( 12.011 + 1.00794 ) g m o l 1
n \s= \s78 \s12.011 \s+ \s1.00794 =6 \s .
And the chemical formula is C 6 H 6.
Molecular formula, although not always.≡
empirical formula, which includes the multiple n=1 \s .
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Calculate the molality of each of the following aqueous solutions (a) 2. 50 m nacl solution (density of solution = 1. 08 g/mL) (b) 48. 2 percent by mass KBr solution
The molarity of 2. 50 m NaCl solution is 2.68 molal and 48. 2 percent by mass KBr solution is 7.82 m.
Molality = moles solute / kg solvent
Assume we have 1000 ml of solution.
1000 ml ₓ 1.08 g/ml = 1080 g
Now find the mass of NaCl:
2.50 M NaCl = 2.50 mol/L and 2.50 mol/L x 1 L = 2.50 moles of NaCl
molar mass NaCl = 58.4 g/mol, therefore mass NaCl present = 2.50 mol ₓ 58.5 g/mol = 146 g NaCl
Now find the mass of H₂O:
grams H₂O present = 1080 g - 146 g = 934 g H2O = 0.0.934 kg
We now have moles NaCl and kg H₂O
Molality = 2.50 mol / 0.934kg = 2.68 molal
48.2% by mass of KBr means 48.2 g KBr / 100 g solution
To find molality, we need moles of KBr and kg of H₂O. We can easily find he moles of KBr from the mass and the molar mass.
If we have 100 g solution, 48.2 g is KBr so the rest is H₂O.
100 g - 48.2 g = 51.8 g H₂O and this is equal to 0.0518 kg H₂O
Moles KBr = 48.2 g KBr ₓ 1 mol KBr/119 g = 0.405 moles KBr
Molality = 0.405 moles KBr / 0.0518 kg H₂O = 7.82 m
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Explain how electron micrographs such as this helped falsify the Davson-Danielli model of membrane structure
Electron micrographs aided Davson-Danielli in determining the membrane structure since they assumed the phospholipids were in between the proteins, resulting in the sandwich model.
What is electron micrographs?An picture acquired by hitting the object with a tightly focused (10 nm diameter) electron beam and measuring the transmitted, secondary, backscattered, and diffracted electrons, as well as the distinctive X-rays released. The method of electron microscopy (EM) is used to acquire high-resolution pictures of biological and non-biological material. In biomedical research, it is utilized to explore the precise structure of tissues, cells, organelles, and macromolecular complexes. Modern electron microscopes generate electron micrographs by capturing pictures with sophisticated digital cameras and frame grabbers.
Here,
Davson-Danielli was assisted in establishing the membrane structure by electron micrographs since they thought the phospholipids were in between the proteins, resulting in the sandwich model.
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Select the correct answer. which gas is the most abundant greenhouse gas?
a. ozone
b. chlorofluorocarbon
c. carbon dioxide
d. methane
e. water vapor
E) The most significant and prevalent greenhouse gas is water vapor. Ozone, carbon dioxide, methane, nitrous oxide, and other gases are also present.
Which major source of greenhouse gases is it?Over the past 150 years, almost all of the rise in atmospheric greenhouse gases has been caused by human activities. Burning fossil fuels for transportation, electricity, and heating is the primary human activity in the United States that contributes to the emission of greenhouse gases.
Which four greenhouse gases have the greatest impact?The greenhouse gases on Earth warm the planet by storing heat in the atmosphere. Carbon dioxide, methane, nitrous oxide, and water vapor—all of which are found naturally—as well as fluorinated gases—which are made—are the main gases that cause the greenhouse effect.
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How many moles of K2SO4 are in 216. g of K2SO4? (molar mass = 174.26 g/mol)
Answer:
1 grams K2SO4 to mol = 0.00574 mol
10 grams K2SO4 to mol = 0.05739 mol
50 grams K2SO4 to mol = 0.28693 mol
100 grams K2SO4 to mol = 0.57386 mol
200 grams K2SO4 to mol = 1.14772 mol
500 grams K2SO4 to mol = 2.86929 mol
1000 grams K2SO4 to mol = 5.73858 mol
is the specific heat capacity of gaseous ethanl greater than. less thean or equal to the speciifc heat captity of liquid ethanol
The specific heat capacity of the gaseous ethanol is less than the specific heat capacity liquid ethanol.
The specific heat capacity is given as :
Q = mc ΔT
where ,
Q = heat
m = mass
c = specific heat capacity
ΔT = temperature change
The heating curve represented the temperature , T in the y axis and the heat added at the x - axis. the slope is given as :
T / Q = 1 / C
T is the temperature and the c is the specific heat capacity.
Thus, the heat capacity of the gaseous ethanol is low as compared to the liquid ethanol.
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Why did the scientists only add earthworms to half of the pipes?
...
An annelid can regenerate to some extent after being split in half, and in some species, you may even get two worms. However, the common earthworm only regenerates from the tail end; Every time, the head end dies.
Can worms withstand being divided in half?The Washington Post reports that many earthworms can lose several segments from their head end and grow back, and that almost all worms can regrow their tails if they are amputated. However, for some worms, the likelihood of fully regenerating decreases with the number of segments removed.
What substance does the earthworm secrete to stabilize the tunnel walls?Coelomic fluid, which is secreted by many earthworms, makes it easier for them to move through the soil. This fluid forms a cement-like substance that lines the burrows of some burrowing species to prevent the walls from falling down.
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(100 POINTS + BRAINLIEST) i don't know which subject this belongs to but this is an earth science class!!!
Tell the story of the life cycle of a star the size of our sun, Be sure to include all stages from "pre-birth" to death.
Describe the differences between our sun's life cycle to a star who is at least 5 times bigger than our sun.
The life cycle of a star the size of our sun starts with a nebula, a huge cloud of dust and gas. The gravity of the nebula compresses the cloud until the atoms fuse together, creating a star. This stage is known as pre-birth.
Next, the star enters a main sequence phase, where it shines brightly for millions of years, powered by nuclear fusion.
Eventually the star will slowly run out of hydrogen and the fusion process will become less and less efficient. The star will expand and become what is known as a red giant. This marks the end of the main sequence phase.
After this point, the star expels its outer layers, leaving behind a small, hot core called a white dwarf. It will continue to cool down until it becomes a black dwarf.
If the star is at least 5 times bigger than our sun, it will enter a different life cycle. After the red giant phase, the star will undergo a supernova explosion, which will spew dust and gas into the surrounding areas. These remainders will later form new stars, planets, and other cosmic bodies. What's left of the star will become a neutron star or a black hole.
Which of the following elements can be isolated by electrolysis of the aqueous salt shown? O Phosphorus from K3PO4 (aq) O Sodium from NaBr (aq) O Aluminum from AlCl3 (aq) O ch Fluorine from KF(aq) O lodine from Nal (aq)
The following elements can be isolated by electrolysis of the aqueous salt : Phosphorus from K3PO4 (aq).
What is electrolysis?Electrolysis is the method used to divide water into hydrogen and oxygen. An electrolyzer is a device where this process takes place.
In chemistry and production, the electrolysis method can be used to speed up a typically non-spontaneous chemical reaction. Electrolysis is significant from a business perspective as a phase in the electrolytic cell-based separation of elements from naturally existent sources like ores.
By introducing an electric current into a substance, electrolysis alters its chemical makeup. Depending on the substance, one electron is either lost or acquired during the chemical reaction (oxidation or reduction).
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Using the table of average bond energies, estimate the energy needed to break the bonds of the reactants and the energy released when the products from for the reaction N2 + O2 –> 2NO. Note N2 has a triple bond and O2 and NO have double bonds.
The energy that is released for the breaking of bonds is 229 kJ/mol.
What is the energy released?We should be able to recall that the enthalpy of the reaction taken to be the energy that is evolved or absorbed in the reaction that is ongoing. We have to note that in the course of the reaction there would be the breaking and the making of bonds.
Now we know that;
The bond energy can be given as;
Sum energy of the broken bonds of reactants - Sum of the energy of the formed bonds
Hence;
(945 + 498) - 2(607)
1443 - 1214
= 229 kJ/mol
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What do these two changes have in common?
sauce burning on a stove
firing a clay pot in a hot kiln
Both are caused by cooling
Both converse mass
Both are chemical changes
Both are physical changes
sauce burning on a stove and firing a clay pot in a hot kilnBoth are physical changes. Therefore, option D is correct.
What are physical changes?Physical changes can be defined as changes affecting the state of a chemical substance, but not its composition. Physical changes can be used to separate mixtures into their component compounds, but can not generally be used to separate compounds into elements or simpler compounds.
Physical changes takes place when substances undergo a change that can not change their composition. while the chemical change in which the composition of a substance changes when substances combine or break up to form new substances.
In general a physical change can be consideed as reversible using physical means. A physical change includes a change in physical properties such as change of strength, change of durability, textural change, shape, size, volume and density.
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P4(s) + Cl₂(g) → PCI3(l) + energy 4. Calculate the gram-formula mass of the product. Show all work. g/mol
The gram formula mass of the product, PCl₃, is 137.5 g.
What is the gram formula mass of a compound?The amount of a compound that has the same mass in grams as the formula mass in an atomic mass unit is said to have the compound's gram formula mass. It is also known as the molar mass.
Every element's atom has a characteristic mass, and each compound's molecule has a characteristic mass determined by the compound's formula.
The gram formula mass of the product PCl₃ is calculated below:
The atomic mass of P = 31 g
The atomic mass of Cl = 35.5 g
The gram formula mass of PCl₃ = 31 + 35.5 * 3
The gram formula mass of PCl₃ = 137.5 g
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Is 1 mole equal to 1 molecule?
No, a mole doesn't equal a molecule. Despite the fact that the terms "moles" and "molecules" are separate, the idea of "moles" can be used to quantify the number of molecules in a sample.
The primary distinction between a mole and a molecule is that a mole is a unit of measurement for amount whereas a molecule is an atomized chemical species.
A mole of a substance is the same number of molecules of that substance as there are carbon-12 atoms in precisely 12 g of the element. This indicates that the molecular weight of any material, stated in terms of atomic mass units, is equivalent to 1 mole of that substance's weight in grams.
Thus, a mole is an amount of 6.02210²³ particles, whereas a molecule has several atoms of different elements that are chemically connected to one another.
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What are the molecules of aspartame?
Aspartyl-phenylalanine-1-methyl ester, also known as the methyl ester of the dipeptide of the amino acids aspartic acid and the essential amino acid phenylalanine, is the term for an artificial, non-carbohydrate sweetener.
Sweeter than sugar flavoring ingredient that is broken down into phenylalanine and aspartic acid. Aspartyl-phenylalanine-1-methyl ester, also known as the methyl ester of the dipeptide of the amino acids aspartic acid and phenylalanine, is a synthetic, non-carbohydrate sweetener known as aspartame. Aspartic acid is a methyl ester of a dipeptide made up of aspartic acid and phenylalanine, two amino acids. Along with methanol, aspartame is entirely hydrolyzed to its individual amino acids in the digestive system. In the body, aspartame is hydrolyzed into aspartic acid (40%) phenylalanine (50%) and methanol (10%). An amino is aspartic acid.
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The quantity of matter in a body,object,or substance.Mass is measured in the metric system in units if grams kilograms ,milligrams,etc is it A. Work or B.Mass?
The quantity of matter in a body,object,or substance is B. Mass.
What is Mass?A body's mass is an inherent quality. Prior to the discovery of the atom and particle physics, it was widely believed to be related to the amount of matter in a physical body.
It is the most fundamental characteristic of matter and one of the fundamental quantities in physics. Mass is a term used to describe how much matter is present in a body. The kilogram is the SI unit of mass (kg). A body's mass does not alter at any point in time.
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Which supports the idea that conservation of mass is a scientific law instead of a hypothesis?
A- It is an educated guess.
B- It has been tested and supported once or twice.
C- It has been examined, tested and supported over centuries.
D- It has been tested many times and sometimes is true and sometimes isn’t.
Answer:
C- It has been examined, tested and supported over centuries.
Explanation:
The conservation of mass is a scientific law that states that matter cannot be created or destroyed, only transformed from one form to another. This law has been extensively tested and supported over centuries of scientific investigation, and it is considered to be a fundamental principle of chemistry and physics.
Show all your work and make sure to label all the numbers with the correct units if you do, I will give you brainly:
A: A sample of sulfuric acid has a mass of 15.0 g. How many molecules are in this sample?
B: How many moles of sulfuric acid are present in 45 g of this sample?
C: How much would a .750 mole sample of Ammonium sulfate weigh?
D: What is the mass percent of hydrogen in this sample?
If you double the total amount of Na ions, but you also double the amount of water they are dissolved in, __________.
Na ion concentration will remain constant if you increase the overall number of Na ions while also increasing the volume of water in which they are dissolved.
The amount of material in a certain area is referred to as concentration in chemistry. Another definition states that concentration is the ratio of a solution's solute to its entire solution or solvent. Mass per unit volume is a common way to express concentration. However, moles or units of volume can also be used to express the solute concentration. Concentration could be per unit mass instead of volume. Concentration can be computed for any mixture, despite often being used with chemical solutions.
By mathematically dividing the mass, moles, or volume of the solute by the mass, moles, or volume of the solution, one may calculate the concentration (or, less commonly, the solvent).
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A scientist performs an experiment on an unknown element. She finds that the unknown element forms an ionic bond with beryllium (Be). She concludes that the unknown element must belong in group 2 of the periodic table. State whether or not you think this result supports her conclusion, and why. (2 points)
The test result, which shows a bond with beryllium but not lithium, does not support her conclusion.
What is beryllium?
Beryllium basically is a chemical element with the symbol Be and atomic number 4. It is a light, strong, and alkaline metal that is used in alloys, medical equipment, and aerospace components due to its light weight and high strength. It is also used in nuclear reactors as a neutron reflector and absorber.
Beryllium is a group 2 element that forms ionic bonds with nonmetals.
Non-metals are elements ranging from Group 15 to Group 17.
As a result, the unknown element must be from Group 15 to Group 17.
Hence, her conclusion that the unknown element belong to group 2 is wrong.
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Fe(OH)3->Fe2O3->Fe->FeCl2->Fe(OH)2
[tex]Fe(OH)3- > Fe2O3- > Fe- > FeCl2- > Fe(OH)2[/tex], represents a set of possible chemical reactions that Fe(OH)3, or iron(III) hydroxide, can undergo.
In the first reaction, Fe(OH)3 is converted into Fe2O3, or iron(III) oxide, through the process of thermal decomposition. This reaction occurs when Fe(OH)3 is subjected to high temperatures, causing it to break down into Fe2O3 and water vapor.
In the second reaction, Fe2O3 is reduced to Fe, or elemental iron, through the process of electrolysis. This reaction involves passing an electric current through a solution of Fe2O3, causing the Fe2O3 to be reduced to Fe at the cathode and oxygen to be produced at the anode.
In the third reaction, Fe is converted into FeCl2, or iron(II) chloride, through the process of chlorination. This reaction involves adding chlorine gas to a solution of Fe, causing the Fe to be converted into FeCl2 and hydrogen gas.
In the fourth reaction, FeCl2 is converted into Fe(OH)2, or iron(II) hydroxide, through the process of acidification. This reaction involves adding an acid to a solution of FeCl2, causing the FeCl2 to be converted into Fe(OH)2 and hydrochloric acid.
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The correct question is:
Explain this chemical reaction [tex]Fe(OH)3- > Fe2O3- > Fe- > FeCl2- > Fe(OH)2[/tex]
A gas at 110 °C exerts a pressure of 225 torr in a sealed container. The temperature drops to 65 °C. What is the pressure of the gas at the cooler temperature?
According to Gay-Lussac's law, the pressure of the gas at the cooler temperature is 132.95 torr.
What is Gay-Lussac's law?It is defined as a gas law which states that the pressure which is exerted by the gas directly varies with its temperature and at a constant volume.The law was proposed by Joseph Gay-Lussac in the year 1808.
The pressure of the gas at constant volume reduces constantly as it is cooled till it undergoes condensation .
It is given as, P₁/T₁=P₂/T₂ , therefore P₂=225×65/110=132.95 torr.
Therefore,the pressure of the gas at the cooler temperature is 132.95 torr.
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Consider the combustion of propane:
C3H8 +502 3CO2 + 4H₂O
- →
Which of the following unit factors below is correct? (Select all that may apply)
A. There are 5 oxygen molecules reacting for every six oxygen atoms produced in CO2.
B. There are 5 oxygen atoms reacting for every 3 CO₂ molecules produced.
C. There are 10 oxygen atoms reacting for every four water molecules produced.
D. There are 10 oxygen atoms reacting for every six oxygen atoms produced in CO2.
Four water molecules are created for every ten oxygen atoms that are reacting.
Propane:A three carbon alkane, propane has the chemical formula C3H8. At room temperature and pressure, it is a gas, but it can be compressed into a liquid for transportation.
What is the primary use of propane?Its primary applications include home and water heating, food preparation and storage, clothing drying, and the powering of industrial and farm machinery. The production of plastics and other chemicals in the chemical sector also uses propane as a raw ingredient.
What are propane's three drawbacks?Cons of propane heating
Compared to oil heating, propane produces fewer BTUs per gallon.Equipment that burns propane is frequently more expensive to buy than heating systems that use heating oil.To use the apparatus properly, care must be taken because propane is flammable in air.To know more about alkane :
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A student increases the temperature of 300 cm balloon from 30 cm to 60 cm what will the new volume be of the balloon be(remeber to be careful with the units. )
After solving the equation: The new volume of the balloon will be 600 cm3.
What is volume?Volume is a measure of the three-dimensional space occupied by a substance or object. In chemistry, volume is most commonly measured in liters (L). It is used to measure the amount of a substance that is present. For instance, when performing a reaction, the volume of the reactants is measured to determine the molar amounts of the reactants.
This is because the volume of a balloon is directly proportional to its temperature. So when a balloon is heated, the volume increases. In this case, the balloon's temperature was increased by 30 cm, so the volume was increased by 300 cm3 (30 cm x 10 cm3, since the volume of a balloon is proportional to its temperature to the power of 3). Thus, the new volume is 600 cm3 (300 cm3 + 300 cm3).
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