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AP Chemistry/Unit 6: Thermodynamics
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Combustion Stoichiometry and Calorimetry

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The combustion of methane is represented by the equation below.
CH4(g)+2O2(g)→CO2(g)+2H2O(l)\mathrm{CH_4(g) + 2O_2(g) \rightarrow CO_2(g) + 2H_2O(l)}
The standard enthalpies of formation are provided:
ΔHf∘[CH4(g)]=−74.8 kJ/mol\Delta H_f^\circ[\mathrm{CH_4(g)}] = -74.8\ \mathrm{kJ/mol}
\Delta H_f^\circ[\mathrm{CO_2(g)}] = -393.5\ \mathrmmol}
ΔHf∘[H2O(l)]=−285.8 kJ/mol\Delta H_f^\circ[\mathrm{H_2O(l)}] = -285.8\ \mathrm{kJ/mol}
What volume of CH4(g)\mathrm{CH_4(g)} at STP must be combusted to provide enough heat to raise the temperature of 250 g250\ \mathrm{g} of water from 20.0 ∘C20.0\,^{\circ}\mathrm{C} to 80.0 ∘C80.0\,^{\circ}\mathrm{C}? Assume the process has 100% heat transfer.

A

1.12 L

B

0.28 L

C

1.58 L

D

12.5 L

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