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The heat of combustion of carbon to $CO_2$ is −393.5 kJ/mol. The heat released upon formation of 35.2 g of $CO_2$ from carbon and oxygen gas is:
A
−630 kJ
B
−3.15 kJ
C
−315 kJ
D
+315 kJ
Detailed Solution
$C(s) + O_2(g) \rightarrow CO_2(g)$; $\Delta_fH = -393.5$ kJ $mol^{-1}$ (1 mol = 44 g)
Heat for 35.2 g = $\frac{-393.5}{44}\times 35.2 = -315$ kJ
Heat for 35.2 g = $\frac{-393.5}{44}\times 35.2 = -315$ kJ