Problem: The ΔH°f of gaseous dimethyl ether (CH3OCH3) is −185.4 kJ/mol; the vapor pressure is 1.00 atm at −23.7°C and 0.526 atm at −37.8°C. (a) Calculate ΔH°vap of dimethyl ether.

🤓 Based on our data, we think this question is relevant for Professor Holland's class at SDSU.

FREE Expert Solution

Recall: The Clausius-Clapeyron Equation allows us to calculate the enthalpy of vaporization of a liquid using it's vapor pressures at different temperatures. It's given by:

where P1 and P2 are the vapor pressure of the liquid at temperatures T1 and T2, respectively, and R = 8.314 J/mol K.

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Problem Details

The Δf of gaseous dimethyl ether (CH3OCH3) is −185.4 kJ/mol; the vapor pressure is 1.00 atm at −23.7°C and 0.526 atm at −37.8°C. (a) Calculate ΔH°vap of dimethyl ether.

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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 Holland's class at SDSU.

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Our data indicates that this problem or a close variation was asked in Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition. You can also practice Chemistry: The Molecular Nature of Matter and Change - Silberberg 8th Edition practice problems.