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Question

In the reaction : S + 3/2 O2SO3 + 2x kcal and SO2+1/2O2SO3 + y kcal, heat of formation of SO2 is:

A
(x + y)
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B
(x - y)
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C
(2x + y)
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D
(2x - y)
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Solution

The correct option is D (2x - y)
S+3/2O2SO3+2xkcal (i)
SO2+1/2O2SO3+ykcal (ii)
Now, subtract eq. (ii) from (i), we get,
S+O2SO2+2xykcal
Heat of formation of SO2 is equal to 2xy kcal.

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