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Concept explainers
(a)
Interpretation:
Vapor pressure of methanol and ethanol has to be calculated.
Concept introduction
Vapor pressure is the pressure which is expend by a gas above its condensed phase (either solid phase or liquid phase) and it does not depends on the system’s volume and surface of the or liquid.
The vapor pressure of a gas in a mixture is the product of the mole fraction of the gas and the total pressure.
A mole fraction of a molecule in a mixture is the ratio of number of moles of particular molecule to the sum of number of moles of all molecules in the mixture.
Equation for mole fraction of a molecule in a mixture of two molecules can be given as:
(a)
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Answer to Problem 13.51QP
Vapor pressure of ethanol is
Vapor pressure of methanol is
Explanation of Solution
Given data follows as:
Vapor pressure of ethanol at
Vapor pressure of methanol at
Amount of methanol in mixture is
Amount of ethanol in mixture is
From its given mass is,
Number of moles of methanol is given as:
Molecular mass of methanol is
Number of moles of ethanol is given as:
Molecular mass of ethanol is
Equation for mole fraction of a molecule in a mixture of two molecules can be given as:
Mole fraction of methanol is given as:
Mole fraction of ethanol is given as:
From the value of mole fraction of methanol and mole fraction of ethanol can be calculated.
Equation for the vapor pressure is given as:
Vapor pressure of methanol and ethanol is calculated as:
Vapor pressure of ethanol is
Vapor pressure of methanol is
(b)
Interpretation:
Mole fraction of methanol and ethanol has to be calculated.
Concept introduction:
Mole fraction
(b)

Answer to Problem 13.51QP
Mole fraction of methanol is
Mole fraction of ethanol is
Explanation of Solution
Given data follows as:
Vapor pressure of ethanol at
Vapor pressure of methanol at
Amount of methanol in mixture is
Amount of ethanol in mixture is
Mole fraction of methanol and ethanol is calculated as:
Mole fraction of methanol is
From the value of mole fraction of methanol, mole fraction of ethanol has calculated.
Mole fraction of ethanol can be given as:
Mole fraction of ethanol is
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Chapter 13 Solutions
General Chemistry
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