The Relationship Between the Vapor Pressure of a Liquid and Temperature

question 79

Multiple Choice

The relationship between the vapor pressure of a liquid and temperature can be expressed by the Clausius-Clapeyron equation:
Ln[P₂/P₁] = [Δ_vapH/R] × [1/T₁ - 1/T₂]
Ethanol (C₂H₅OH) has a normal boiling point of 78.3 °C and,with Δ_vapH = 39.3 kJ/mol.What is the vapor pressure of ethanol at 50.0 °C?

• A)118 Torr
• B)234 Torr
• C)354 Torr
• D)485 Torr
• E)670 Torr

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Definitions:

Expected Value

The long-run average value of repetitions of the experiment it represents, essentially a mean of a random variable in probability and statistics.

Probability

The quantification of the probability of an event happening, expressed as a numeric value ranging from 0 to 1.

Hurdle Rate

The minimum rate of return on an investment required by a manager or investor to proceed with the project.

IRR

Internal Rate of Return; a financial metric used to evaluate the profitability of investments.