We’re being asked to determine the heat of vaporization of a substance. We’re given the vapor pressure at two different temperatures. For this problem, we can use the Clausius-Clapeyron Equation:
P1 = vapor pressure at T1
P2 = vapor pressure at T2
ΔHvap = heat of vaporization (in J/mol)
R = gas constant (8.314 J/mol•K)
T1 and T2 = temperature (in K).
An unknown liquid has a vapor pressure of 88 mmHg at 45 ◦C and 39 mmHg at 25◦C. What is its heat of vaporization?
1. 32 kJ/mol
2. 2000 J/mol
3. 32000 kJ/mol
4. 2000 kJ/mol
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What scientific concept do you need to know in order to solve this problem?
Our tutors have indicated that to solve this problem you will need to apply the Clausius-Clapeyron Equation concept. You can view video lessons to learn Clausius-Clapeyron Equation. Or if you need more Clausius-Clapeyron Equation practice, you can also practice Clausius-Clapeyron Equation practice problems.
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Based on our data, we think this problem is relevant for Professor Sutcliffe's class at TEXAS.