Multiple Choice Questions A sample of 3.00 moles of liquid
A sample of 3.00 moles of liquid water is heated from 10°C to 80°C. Determine q for this sample of water during this process. (The specific heat of water is 4.18 J/g°C.)
878 J wrong answer
878 J
18.1 kJ wrong answer
15.8 kJ
15.8 kJ
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8.00 grams of CH4 gas are completely combusted in the presence of excess oxygen gas in a bomb calorimeter. The heat capacity of the calorimeter and its contents is 18.2 kJ/°C, and the calorimeter rises in temperature from 25.0°C to 49.5°C. Determine the enthalpy of combustion of CH4 gas in units of kJ/mol.
56 kJ/mol
446 kJ/mol wrong answer
446 kJ/mol wrong answer
892 kJ/mol
892 kJ/mol
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Gas grills typically use the combustion of propane, C3H8 (g), to heat up the grill. The combustion of propane is shown in the following balanced chemical reaction:
C3H8 (g) + 5 O2 (g) > 3 CO2 (g) + 4 H2O (l)
Using the information given below, determine the ?H° for this reaction.
Useful Information:
?H°f (C3H8 (g)) = 104 kJ/mol
?H°f (H2O (l) = 286 kJ/mol
?H°f (CO2 (g) = 393 kJ/mol
575 kJ/mol
2219 kJ/mol wrong answer
2219 kJ/mol
2427 kJ/mol
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Consider the following chemical reaction and associated change in enthalpy:
H2 (g) + F2 (g) > 2 HF (g) ?H = 542 kJ/mol
Determine ?H for the following reaction:
HF (g) > 12 H2 (g) + 12 F2 (g) ?H = ???
271 kJ/mol
271 kJ/mol
542 kJ/mol wrong answer
542 kJ/mol
1084 kJ/mol wrong answer
1084 kJ/mol
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Consider the following data:
NO (g) + 1/2 O2 (g) > NO2 (g) ?H = 56 kJ/mol
N2O4 (g) > 2 NO2 (g) ?H = 58 kJ/mol
Determine the ?H for the following reaction:
2 NO (g) + O2 (g) > N2O4 (g)
?H = 170 kJ/mol
?H = 54 kJ/mol wrong answer
?H = 2 kJ/mol
?H = 54 kJ/mol
?H = 170 kJ/mol wrong answer
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