A solution is made of two volatile solutes: Chemical A (with a pure vapor pressure of 80.0 mm Hg) and Chemical B (with a pure vapor pressure of 100.0 mm Hg). The solution has a total vapor pressure of (9.66x10^1) mm Hg. If the solution is known to be made from 3.00 mol of A, how many moles of B must there be in the solution?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section: Chapter Questions
Problem 127QRT
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A solution is made of two volatile solutes: Chemical A (with a pure vapor pressure of
80.0 mm Hg) and ChemicalB (with a pure vapor pressure of 100.0 mm Hg). The
solution has a total vapor pressure of (9.66x10^1) mm Hg.
If the solution is known to be made from 3.00 mol of A, how many moles of B must
there be in the solution?
HINT: The total pressure is the sum of each chemical's partial pressure: Pt = PA +
PB.
Use PA = XA PA° for both the partial pressure of chemicals A and B.
Enter your answer in scientific notation with 3 sig figs. Do not include any units in
your answer.
Do not round any intermediate calculations.
Note: Your answer is assumed to be reduced to the highest power possible.
Transcribed Image Text:A solution is made of two volatile solutes: Chemical A (with a pure vapor pressure of 80.0 mm Hg) and ChemicalB (with a pure vapor pressure of 100.0 mm Hg). The solution has a total vapor pressure of (9.66x10^1) mm Hg. If the solution is known to be made from 3.00 mol of A, how many moles of B must there be in the solution? HINT: The total pressure is the sum of each chemical's partial pressure: Pt = PA + PB. Use PA = XA PA° for both the partial pressure of chemicals A and B. Enter your answer in scientific notation with 3 sig figs. Do not include any units in your answer. Do not round any intermediate calculations. Note: Your answer is assumed to be reduced to the highest power possible.
A certain pure solvent freezes at 39.8°C and has a freezing point depression
constant Kf = 0.777°C/m. What is the predicted freezing point (in °C) of a solution
made from this solvent that is (1.46x10^0) m in a non-electrolyte solute?
Enter your answer in scientific notation with 3 sig figs. Do not include any units in
your answer.
Do not round any intermediate calculations.
Note: Your answer is assumed to be reduced to the highest power possible.
Transcribed Image Text:A certain pure solvent freezes at 39.8°C and has a freezing point depression constant Kf = 0.777°C/m. What is the predicted freezing point (in °C) of a solution made from this solvent that is (1.46x10^0) m in a non-electrolyte solute? Enter your answer in scientific notation with 3 sig figs. Do not include any units in your answer. Do not round any intermediate calculations. Note: Your answer is assumed to be reduced to the highest power possible.
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