-503.7 kJ
-282.6 kJ
+282.6 kJ
+503.7 kJ
Correct answer is B
Energy change (ΔH) = 2ΔHCO2 - (2ΔHCO + ΔHO)
= 7x - 393 - (7 * 110.4 + 0)
= -393 + 110.4 = -282.6 kJ
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