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thermo_p3 - Thermo Practice Problems#3 Clemens 1 Calculate...

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Thermo Practice Problems #3 Clemens 1. Calculate the enthalpy change for the following reaction: N 2 O (g) + NO 2 (g) 3 NO (g) Given the following N 2 (g) + O 2 (g) 2NO (g) Δ H = 180.7kJ 2 NO (g) + O 2 (g) 2 NO 2 (g) Δ H = -113.1kJ 2 N 2 O (g) 2 N 2 (g) + O 2 (g) Δ H = -163.2kJ 2. Calculate the change in enthalpy for the combustion of 1 mole of benzene, C 6 H 6 , using standard heats of formation. Δ H o f (C 6 H 6 ) = 49.0kJ/mol, (H 2 O (l) = -285.8 kJ/mol, (CO 2 (g)) = -393.5kJ/mol.

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3. Identify the dominant IMF between the pairs of molecules/ions listed below.
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Unformatted text preview: Molecule/Ion IM Force NH 3 and H 2 O CO and HBr CO 2 and N 2 SO 2 and H 2 O octane and water 4. Rank the following by their expected boiling point: HBr, HF, CO, O 2 and N 2 . 5. Which liquid would you expect to have the highest vapor pressure and why, CH 3 OH or CH 3 OCH 3 . 6. If 1.0L of ethanol is placed in a room at 25 o C that is 3.00m x 2.50m x 2.50m will the alcohol evaporate? The vapor pressure of ethanol at 25 o C is 59mmHg and the density of ethanol is 0.789g/mL....
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