The combustion of glucose, cap c sub 6 cap h sub 12 cap o sub 6 s , produces carbon dioxide, CO sub 2 times g , and water, cap h sub 2 cap o g , according to the equation. cap c sub 6 cap h sub 12 cap o sub 6 s plus 6 cap o sub 2 g rightarrow 6 CO sub 2 g plus 6 cap h sub 2 cap o l The enthalpy of the reaction is negative 2 comma 840 kJ What is the heat of combustion, per mole, of glucose?
Answer
A
473 point 3 kJ over mol
B
negative 2 comma 840 kJ over mol
C
2 comma 840 kJ over mol
D
negative 473 point 3 kJ over mol
Explanation
The balanced equation shows 1 mole of glucose reacting, and the reaction enthalpy is −2,840 kJ for that reaction as written. Therefore, the heat of combustion per mole of glucose is −2,840 kJ/mol. The negative sign indicates that combustion releases heat.
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