Determine the Heat of Reaction for the Decomposition of One

question 47

Multiple Choice

Determine the heat of reaction for the decomposition of one mole of benzene to acetylene, C₆H₆(l) ? 3C₂H₂(g)
Given the following thermochemical equations:
$\begin{array}{ll}2 \mathrm{C}_{6} \mathrm{H}_{6}(l) +15 \mathrm{O}_{2}(g) \rightarrow 12 \mathrm{CO}_{2}(g) +6 \mathrm{H}_{2} \mathrm{O}(g) & \Delta H=-6271 \mathrm{~kJ} \\2 \mathrm{C}_{2} \mathrm{H}_{2}(g) +5 \mathrm{O}_{2}(g) \rightarrow 4 \mathrm{CO}_{2}(g) +2 \mathrm{H}_{2} \mathrm{O}(g) & \Delta H=-2511 \mathrm{~kJ}\end{array}$

• A) 631 kJ
• B) 1262 kJ
• C) 3760 kJ
• D) 6902 kJ
• E) 8782 kJ

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