Multiple Choice
The vapor pressure of dichloromethane at 260 K is 71 torr. What is the vapor pressure at 310 K, given that ΔHvap = 31.4 kJ/mol?
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13. Liquids, Solids & Intermolecular Forces
Clausius-Clapeyron Equation
Multiple Choice
Which three variables are directly related in the Clausius-Clapeyron equation?
A
Pressure, volume, and temperature
B
Vapor pressure, volume, and entropy
C
Concentration, temperature, and entropy
D
Vapor pressure, temperature, and enthalpy of vaporization
Verified step by step guidance1
Recall that the Clausius-Clapeyron equation describes the relationship between the vapor pressure of a substance and its temperature during a phase change, such as vaporization.
Identify the key variables involved in the Clausius-Clapeyron equation: vapor pressure (\(P\)), temperature (\(T\)), and the enthalpy of vaporization (\(\Delta H_{vap}\)).
Understand that volume and entropy are not directly part of the Clausius-Clapeyron equation, although entropy changes relate to phase changes in a broader thermodynamic context.
Recognize the general form of the Clausius-Clapeyron equation: \(\ln P = -\frac{\Delta H_{vap}}{R} \cdot \frac{1}{T} + C\), where \(R\) is the gas constant and \(C\) is a constant.
Conclude that the three variables directly related in the Clausius-Clapeyron equation are vapor pressure, temperature, and enthalpy of vaporization.
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