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2CO_(g) + O_2(g) → 2CO_2(g)<...

2CO_(g) + O_2(g) → 2CO_2(g)
Given that ΔH[CO]is -110.4 kJmol^-1 and ΔH[CO₂] is -393.0 kJmol^-1, the energy change for the reaction above is

A.

-503.7 kJ

B.

-282.6 kJ

C.

+282.6 kJ

D.

+503.7 kJ

View answer & explanation

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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