1. The limiting reactant is CuCl₂
2. The theoretical yield of copper is 0.24 g
Balanced equation2Al + 3CuCl₂ —> 2AlCl₃ + 3Cu
The following were obtained from the balanced equation:
Molar mass of Al = 27 g/mol Mass of Al from the balanced equation = 2 × 27 = 54 gMolar mass of CuCl₂ = 63.55 + (2 × 35.5) = 134.55 g/mol Mass of CuCl₂ from the balanced equation = 3 × 134.55 = 403.65 gMolar mass of Cu = 63.55 g/mol Mass of Cu from the balanced equation = 3 × 63.55 = 190.65 gFrom the balanced equation above,
54 g of Al reacted with 403.65 g of CuCl₂ to produce 190.65 g of Cu
1. How to determine the limiting reactantFrom the balanced equation above,
54 g of Al reacted with 403.65 g of CuCl₂
Therefore,
0.5 g of Al will react with = (0.5 × 403.65) / 54 = 3.74 g of CuCl₂
From the above calculation, we can see that a higher amount (i.e 3.74 g) of CuCl₂ than what was given (i.e 0.5 g) is needed to react completely with 0.5 g of Al.
Thus, CuCl₂ is the limiting reactant.
2. How to determine the theoretical yield of copperFrom the balanced equation above,
403.65 g of CuCl₂ reacted to produce 190.65 g of Cu
Therefore,
0.5 g of CuCl₂ will react to produce = (0.5 × 190.65) / 403.65 = 0.24 g of Cu
Thus, the theoretical yield of Cu is 0.24 g
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Bleach has a pH of 13. Calculate the hydrogen ion concentration of bleach
In order to calculate the pH and concentration of hydrogen ions we will usually have two formulas:
pH = -log [H+], this one for pH, but in our question we want to find out what is the concentration of H+, so let's modify the pH equation:
[H+] = 10^-pH
[H+] = 10^-13
[H+] = 1*10^-13, this is the concentration of hydrogen ions for Bleach
Weight is best defined as _____. A the amount of space an object takes up B the speed of an object C the force of gravity on an object D the amount of energy in an object
Weight is best defined as the force of gravity on an object (option C).
What is weight?Weight is the force on an object due to the gravitational attraction between it and the Earth (or whatever astronomical object it is primarily influenced by).
Weight is different from mass being that weight is a dependent on the gravitational force of the object's habitation, however, mass is not.
For example, the mass of an object on Earth can be 10kg, however, the weight of the object is 100N because the gravitational force of the Earth is 10m/s².
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Please I need help thank you
Answer:
its sodium hydroxide
Explanation:
The pressure of a mixture of nitrogen, carbon dioxide, and oxygen is 74 am. What is the partial pressure of oxygen if the partial pressures of the nitrogen and carbon dioxide are 54 ka and 19 ka, respectively?
The pressure of oxygen is 1 Ka
What is the partial pressure?Partial pressure is the pressure that a gas would exert if it occupied the same volume as a mixture of gases, but alone. In other words, it is the pressure that a gas contributes to the total pressure of a mixture of gases.
The partial pressure of a gas can be calculated using the following equation:
Partial pressure = Total pressure x mole fraction
where the mole fraction is the fraction of the total number of moles of gas that is made up by the particular gas of interest.
Let total pressure = PA + PB + PC
Then the pressure of the oxygen = 74 - (54 + 19)
= 1 Ka
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11. Sound _________ are imitations of sounds from other things.
12 Sound can be
it came from.
heard
is how fast or slow a sound is moving
are imitations of sounds from
to see which direction
Sound effects are imitations of sounds from other things. Sound can be timed to see which direction it came from.
What is sound?In terms of physics, sound is indeed a vibration that travels through a data transmission like a gas, liquid, or solid as an acoustic wave. Sound is the receipt of these waves and the brain's perception of them in terms of human physiology and psychology.
Only acoustic waves with frequencies between around 20 Hz as well as 20 kHz, or the audio variable frequency, may cause a human to have an auditory sensation. Sound effects are imitations of sounds from other things. Sound can be timed to see which direction it came from.
Therefore, sound effects are imitations of sounds from other things. Sound can be timed to see which direction it came from.
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How many moles of NaHCO3 are in 2.4 x
1024 molecules of NaHCO:?
4.0 moles NaHCO
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
MolesAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
[Given] 2.4 × 10²⁴ molecules NaHCO
[Solve] moles NaHCO
Step 2: Identify Conversion
Avogadro's Number
Step 3: Convert
[DA] Set up: \(\displaystyle 2.4 \cdot 10^{24} \ molecules \ NaHCO(\frac{1 \ mol \ NaHCO}{6.022 \cdot 10^{23} \ molecules \ NaHCO})\)[DA] Divide [Cancel out units]: \(\displaystyle 3.98539 \ moles \ NaHCO\)Step 4: Check
Follow sig fig rules and round. We are given 2 sig figs.
3.98539 moles NaHCO ≈ 4.0 moles NaHCO
Which of these was not proposed by john dalton in 1805?
A. All matter is made of atoms.
B. Adams are made of protons, neutrons and electrons.
C. During chemical reactions, atoms rearrange themselves.
D. The atoms of a particular element are all identical.
Answer:
Atoms are made of protons, neutrons and electrons.
Explanation:
The Dalton's atomic theory was an early attempt at describing the properties of atoms. It stipulated that atoms were the smallest indivisible particle of a substance. Chemical reactions occur as a result of a combination or separation of atoms. Atoms of the same element are exactly alike and differ from atoms of other elements. Atoms can neither be created nor destroyed.
As time went on, modern scientific evidence began to modify the original postulates of the Dalton's atomic theory. It was not postulated in 1805 that atoms were composed of subatomic particles; electrons, neutrons and protons. Dalton's theory held the atom to be 'indivisible'. However in 1897, JJ Thompson discovered the electron. Subsequently, the proton and neutrons were discovered. This shows that the atom in itself consisted of even smaller particles.
what organ is very important in human body
Answer:
The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings—all the things that make us human.
Explanation:
Answer:
The brain is arguably the most important organ in the human body. It controls and coordinates actions and reactions, allows us to think and feel, and enables us to have memories and feelings—all the things that make us human.
Explanation:
How long did it take a bike to travel 20 miles in 12.5 mph?
Answer:
2 hours and 4 mins
0.72 moles SO2 how many molecules
0.72 moles SO2 contains 4.33 × \(10^{23}\) molecules.
What is molecule?A molecule refers to a group of two/more atoms bounded together by attractive forces known as chemical bonds. Depending on the context, the term may include ions that meet this criterion. A molecule is made up of one or more atoms. If they contain multiple atoms, those atoms can be the same (the oxygen molecule has two oxygen atoms) or different (the water molecule has two hydrogen atoms and one oxygen atom). Biomolecules such as proteins and DNA are made up of thousands of atoms. A group of two/more atoms of the same/different elements chemically bonded together is called a molecule.For example, two hydrogen atoms and one oxygen atom react to form a water molecule.To learn more about molecule from the given link :
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Help with this question, I’ve already got part a done I need part b and c
The number of moles of excess reagent left after the reaction is complete would be sodium phosphate and The mass of excess reagent that will remain unreacted is copper (II) nitrate.
The molar amounts of reactants and products that will result from a balanced chemical equation are shown. Rarely are reactants combined in the exact amount required in the actual world. Before the others, one reactant will be entirely depleted. The limiting reactant is the one that is consumed first in a reaction. The residual amount is deemed "in excess" once the other reactants have been partially consumed.
Calculate the volume of the product each reactant produced to identify the limiting reactant. The limiting reactant is the one that yields the smallest amount of product.
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How many moles are in 1.81x10^26 molecules of H2O
According to mole concept and Avogadro's number , there are 300.5 moles in 1.81×10²⁶ molecules of water.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
As 1 mole= 6.023×10²³ molecules ,therefore 1.81×10²⁶ molecules= 1.81×10²⁶ /6.023×10²³=300.5 moles.
Thus, there are 300.5 moles in 1.81×10²⁶ molecules of water.
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What is another name for radioactive dating?
Answer:
radioisotope dating is another name
Answer:
Radiometric dating
Explanation:
hope that helps
Fun With Predicting Reaction Products
I erased my answers so far but i’m confused about every thing on this paper. Pleaseeeee help thanks
To predict the products of such a reaction, see what happens if the chemical breaks into smaller, familiar products such as water, carbon dioxide, or any of the gaseous elements
Describe the type of reaction that was indicated.AgNO3+Na2SO4→AgSO4+2NaNO3 is an exchange reaction.
Na + O2→ Na2O .
is an exchange reaction.
Thus, we refer to these processes as redox. Na is oxidized by losing electrons in reaction (a), while O is reduced by gaining electrons, forming O2-ions.
A single-displacement reaction would be Mg + HBr > MgBr2 + H2 HBr + Mg. In this process, magnesium creates magnesium bromide by swapping out hydrogen from HBr (MgBr2).
The decomposition process CuSO4(aq) + Zn(s) ZnSO4(aq) + Cu(s) is an illustration.
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The Ka value of HCN is Ka= 6.20 ×10–^10Calculate the pH of a 0.150 M HCN solution.
ANSWER
the pH of the solution is 5.02
EXPLANATION
Given that;
The Ka value of HCN is 6.20 x 10^-10
The concentration of HCN is 0.150M
Follow the steps below to find the pH of the solution
Step 1; Write the dissociation equation of the weak acid
\(\text{ HCN + H}_2O\text{ }\rightarrow\text{ H}_3O^+\text{ + CN}^-\)Let the dissociation of the weak acid be x
So, we have
HCN + H2O ----------->. H3O^+ + CN^-
Initial. C 0 0
Equilibrium. c(1 - x) cx cx
Step 2; Find the value of x
\(\begin{gathered} \text{ K}_a\text{ = cx }\times\text{ }\frac{\text{ cx}}{c(1\text{ - x\rparen}} \\ \\ \text{ K}_a\text{ = }\frac{\text{ cx}^2}{(1\text{ - x\rparen}} \\ \text{ Since the solution is a weak acid, hence, \lparen1 - x\rparen is assumed 1} \\ \text{ Ka = cx}^2 \\ \text{ Isolate x}^2 \\ \text{ x}^2\text{ = }\frac{\text{ K}_a}{\text{ c}} \\ \text{ } \\ \text{ x = }\sqrt{\frac{K_a}{c}} \end{gathered}\)Substitute c = 0.150 and Ka = 6.20 x 10^-10 in the above formula to find x
\(\begin{gathered} \text{ x =}\sqrt{\frac{6.20}{0.150}}\times\text{ }\sqrt{10^{-10}} \\ \text{ x = }\sqrt{41.33}\text{ }\times\text{ 10}^{-5} \\ \text{ x = 6.43 }\times\text{ 10}^{-5} \end{gathered}\)Step 3; Find the concentration of the hydroxonium ion
Recall,
\(\begin{gathered} \lbrack H_3O^+\rbrack\text{ = cx} \\ \text{ Then} \\ \text{ }\lbrack H_3O^+\rbrack\text{ = 0.150 }\times\text{ 6.43 }\times\text{ 10}^{-5} \\ \text{ }\lbrack\text{ H}_3O^+\rbrack\text{ = 0.9645 }\times\text{ 10}^{-5} \\ \text{ }\lbrack\text{ H}_3O^+\rbrack\text{ = 9.645 }\times\text{ 10}^{-6}\text{ M} \end{gathered}\)Step 4; Find the pH of the solution
\(\begin{gathered} \text{ pH = -log }\lbrack H_3O^+\rbrack \\ \text{ pH = -log 9.645 }\times\text{ 10}^{-6} \\ \text{ pH = 5.02} \end{gathered}\)Therefore, the pH of the solution is 5.02
A 32.9 L sample of a gas at constant pressure increases in temperature from 25C to 45C. Should the volume increase or decrease?
If the temperature of the sample of gas changes from 25°C to 45°C, the volume of the gas will increase.
What is Charles's law?Charles's law is the gas law stating that the density of an ideal gas is inversely proportional to its temperature at constant pressure.
In other words, the law states the volume of a gas is directly proportional to the temperature of the gas. The equation is given as follows:
V₁/T₁ = V₂/T₂
Where;
V₁ and T₁ are the initial volume and temperatureV₂ and T₂ are the final volume and temperature respectively.According to this question, a sample of a gas at constant pressure increases in temperature from 25°C to 45°C. This means that as the temperature increases, the volume also increases.
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Convert 1.5x10^25 atoms of hydrogen into moles of Hydrogen
When 148. mg of a certain molecular compound X are dissolved in 75.g of cyclohexane (CH), the freezing point of the solution is measured to be 59 'C. Calculate the molar mass of X If you need any additional information on cyclohexane, use only what you find in the ALEKS Data resource. Also, be sure your answer has a unit symbol, and is rounded to l significant digit. XS ?
Answer: The molar mass of X is 61.3g/mol
Explanation:
Depression in freezing point is given by:
\(\Delta T_f=K_f\times m\)
\(\Delta T_f=T_f^0-T_f=(6.55^0C-5.9^0C)=0.65^0C\) = Depression in freezing point
\(K_f\) = freezing point constant = \(20.2^0C/mol\)
m= molality = \(\frac{\text{Mass of solute}}{\text{Molar mass of solute}\times \text{Mass of solvent in Kg}}\)
where,
Now put all the given values in this formula, we get
\(0.65^0C=20.2°C/m\times frac{0.148g}}{M\times 0.075kg}\)
\(M=61.3g/mol\)
Thus molar mass of X is 61.3g/mol
How many carbon and hydrogen atoms are in KNO3?
Answer: 3 mol oxygen.
Explanation: Because by definition you have 1 mol of potassium nitrate. Potassium nitrate in this quantity comprises 1 mol K, 1 mol N,
For the reaction Ti(s)+2F2(g)→TiF4(s) compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants. You may want to reference (Pages 299 - 306) Section 7.5 while completing this problem. Part B 2.6 g Ti, 1.4 g F2 Express your answer using two significant figures.
The theoretical yield of the titanium tetra fluoride is 2.3 g.
What is the theoretical yield?We know that we can be able to obtain the theoretical yield from the stoichiometry of the reaction. We already have the balanced chemical reaction equation as shown in the question.
Number of moles of Titanium = 2.6 g/49 g/mol = 0.053 moles
Number of moles of fluorine = 1.4 g/38 g/mol = 0.037 moles
Given that 1 mole of Titanium reacts with 2 moles of fluorine
0.053 moles reacts with 0.053 moles * 2 moles/ 1 mole
= 0.106 moles
Thus fluorine is the limiting reactant
Now;
2 moles of fluorine produces 1 mole of titanium fluoride
0.037 moles of fluorine produces 0.037 moles * 1 mole/ 2 moles
= 0.0185 moles
Theoretical yield of the product = 0.0185 moles * 124 g/mol
= 2.3 g
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12.39 g sample of phosphorus (30.97 g/mol) reacts with 52.54 g of chlorine gas, Cl2
(70.91 g/mol) to form only phosphorus trichloride, PC13 (137.33 g/mol). Which is the
limiting reactant?
Answer:
P is the limiting reagent
Explanation:
P = phosphorus = 30.97g/mol
Cl2 = Chlorine = 70.91g/mol
PCl3 = Phosphorus Trichloride = 137.33g/mol
P + Cl2 = PCl3
Left Side
P = 1
Cl = 2
Right Side
P = 1
Cl = 3
So equation needs to be balanced first
2P + 3Cl = 2PCl3
Left Side
P = 2
Cl = 6
Right Side
P = 2
Cl = 6
That's better.
Ok so we have 12.39g of P so we have 0.4 moles of it
We then have 52.54g of Cl so we have 0.74 moles of it
For every P we need 1.5 Cl so we have an excess of Cl
What happens to the balance of reversible reaction at equilibrium when pressure is increased
Answer:
The equilibrium position shift to the side (reactant/product, depending on the reaction) where there is a smaller no. of moles of gas.
According to Le Châtelier's principle, when a chemical system at equilibrium is distributed by a change in conditions, the equilibrium position will shift in a direction that tends to counteract the change.
Hence, when there is an increase in pressure, the equilibrium will counteract the change by reducing the pressure through decreasing the no. of moles of gas (shifting to the side with a smaller no. of moles of gas).
Note: At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.
PLEASE HELP ASAP
(50 POINTS)
You have 400,000 atoms of a radioactive substance. After 2 half-lives have past, how
many atoms remain?
Remember that you cannot have a fraction of an atom, so round the answer to the
nearest whole number.
Answer:
If 2 half-lives have passed, it means that the radioactive substance has decayed twice, so the number of remaining atoms would be:
1st half-life: 400,000 / 2 = 200,000 atoms remaining
2nd half-life: 200,000 / 2 = 100,000 atoms remaining
Therefore, after 2 half-lives have passed, 100,000 atoms would remain, rounded to the nearest whole number
Explanation:
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HELP! What do I do? It asked me to read the temp but I don't know what to do.
We can deduce here that the data appear to be linear.
What is linear data?Linear data refers to a type of data that follows a linear relationship or exhibits a linear pattern. In the context of data analysis and statistics, linear data refers to a set of data points that can be approximated or modeled by a straight line when plotted on a graph.
When data is considered linear, it means that there is a consistent and proportional relationship between the independent variable (x-axis) and the dependent variable (y-axis). In other words, as the independent variable changes, the dependent variable changes in a constant and predictable manner.
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Which of these acts as a buffer in embalming fluids? O sodium O lauryl O sulfate O calcium O lanolin
The correct answer is calcium sulfate. Calcium sulfate acts as a buffer in embalming fluids, helping to maintain the pH of the solution and prevent decomposition of the tissues. It also helps to reduce the amount of water loss by increasing the osmotic pressure of the solution.
Calcium sulfate acts as a buffer in embalming fluids, helping to maintain a constant pH level and prevent the decomposition of tissues.
It does this by releasing or absorbing protons (H+) into the solution as needed, thus preventing the pH from becoming too acidic or too basic. Additionally, calcium sulfate increases the osmotic pressure of the solution, which helps to reduce the amount of water lost from the tissues. This helps the embalmed tissues to remain intact for a longer period of time.
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What forms of energy are produced when
fossil fuels burn?
When fossil fuels burn, several forms of energy are produced, including:
Heat energy: The primary form of energy released during fossil fuel combustion is heat. Fossil fuels contain chemical energy stored for millions of years, and when they burn, this energy is released in the form of heat. The heat energy can be harnessed for various purposes, such as heating buildings or generating steam to drive turbines.
Light energy: Burning fossil fuels can also produce light energy in the form of flames or glowing embers. This light energy is a byproduct of combustion.
Mechanical energy: Heat generated by burning fossil fuels can be converted into mechanical energy. This is typically achieved by using heat to produce steam, which drives a turbine connected to a generator. The rotating turbine converts the heat energy into mechanical energy, which is further transformed into electrical energy.
Electrical energy: Through the process described above, burning fossil fuels can ultimately generate electrical energy. The mechanical energy produced by the turbine is converted into electrical energy by the generator. Electrical energy can power various devices, appliances, industries, and infrastructure.
It's critical to note that while burning fossil fuels can produce useful forms of energy, it also results in the release of carbon dioxide and other greenhouse gases. This contributes to climate change and environmental concerns. As a result, there is a global shift towards cleaner and renewable energy sources to mitigate these negative impacts.
sodium chloride is made from sodium and chloride. would you expect the properties of sodium chloride to be simliar to sodium or cloride
Answer:
No
Its a chemical change so the characteristics or chemical properties always differs thereby the properties of sodium chloride isn't similar to sodium or chloride
Determine the mass of a 24.5 % calcium chloride solution that contains 15.8 grams of calcium chloride.
Considering the definition of percentage by mass, the mass of a calcium chloride solution is 64.49 grams.
Definition of percentage by massThe percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.
In other words, the percentage by mass of a component of the solution is is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:
percentage by mass= (mass of solute÷ mass of solution)× 100
Mass of calcium chloride solutionIn this case, you know:
percentage by mass= 24.5%mass of solute= mass of calcium chloride= 15.8 gmass of solution= ?Replacing in the definition of percentage by mass:
24.5= (15.8 g÷ mass of solution)× 100
Solving:
24.5÷ 100= 15.8 g÷ mass of solution
0.245= 15.8 g÷ mass of solution
0.245× mass of solution= 15.8 g
mass of solution= 15.8 g÷ 0.245
mass of solution= 64.49 grams
Finally, the mass of a calcium chloride solution is 64.49 grams.
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Consider the equilibrium of methanol vapor and the liquid.
CH₂OH(1) CH₂OH(g)
What is the vapor pressure of the methanol at -30 °C?
What is the vapor pressure of the methanol at 40 °C?
Thermodynamic Table at 25 °C
Substance AH; (kJ/mol) S (J/mol-K) AG; (kJ/mol)
CH₂OH(1)
126.8
CH₂OH(g)
239.9
Pvap 5
Pap
=
=
-239.2
-201.0
-166.6
-162.3
atm
atm
The vapor pressure of methanol at 40°C is 0.234 atm.
What distinguishes ethanol from methanol?Only two types of alcohol are methanol and ethanol. Ethanol, sometimes referred to as ethyl alcohol, has a chemical composition of two carbon atoms. Methanol, sometimes referred to as methyl alcohol, is made up of just one carbon atom.
ln(P2/P1) = (ΔHvap/R) x (1/T1 - 1/T2)
ΔGvap = -RTln(Pvap/P) = ΔHvap - TΔSvap
ΔGvap = -RTln(Pvap/P) = -166.6 kJ/mol
ΔSvap = S(g) - S(l) = 239.9 J/mol-K - 126.8 J/mol-K = 113.1 J/mol-K
ΔHvap = ΔGvap + TΔSvap = -166.6 kJ/mol + (298.15 K)(113.1 J/mol-K) = -134.6 kJ/mol
Now we can use the Clausius-Clapeyron equation to find the vapor pressure of methanol at -30°C and 40°C.
At -30°C, we have:
T1 = 25°C + 273.15 = 298.15 K
T2 = -30°C + 273.15 = 243.15 K
ΔHvap = -134.6 kJ/mol
R = 8.314 J/mol-K
ln(P2/5 atm) = (-134.6 kJ/mol / 8.314 J/mol-K) x (1/298.15 K - 1/243.15 K)
P2 = 0.0038 atm
Therefore, the vapor pressure of methanol at -30°C is 0.0038 atm.
At 40°C, we have:
T1 = 25°C + 273.15 = 298.15 K
T2 = 40°C + 273.15 = 313.15 K
ΔHvap = -134.6 kJ/mol
R = 8.314 J/mol-K
ln(P2/5 atm) = (-134.6 kJ/mol / 8.314 J/mol-K) x (1/298.15 K - 1/313.15 K)
P2 = 0.234 atm
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What do these two changes have in common?
sewing an apron
bleaching clothes