2SO2(g) + O2(g) → 2SO3. In the reaction above, the standard heats of formation of...

JAMB 1997

2SO2(g) + O2(g) → 2SO3. In the reaction above, the standard heats of formation of SO2(g) and SO3(g) are -297 KJ mol-1 and -396 kJ/mol respectively. The heat change of the reaction is?

A. -99 kJ mol^-
B. -198 kJ mol^-
C. +198 kJ mol^-
D. +683kJ mol^-

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Correct Answer: Option B

Explanation

2SO2 + O2 → 2SO3
2(-297) 2(-396)
-594 -792
Heat change = heat of product - heat of reactants = -792 - (-594) = -198kj mol-

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2SO2(g) + O2(g) → 2SO3. In the reaction above, the standard heats of formation of...

Correct Answer: Option B

Explanation

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