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Question

S+32O2SO3+2xkcal;
SO2+12O2SO3+ykcal;
The heat of formation of SO2 is :

A
(y2x)
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B
(2x+y)
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C
(x+y)
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D
2x/y
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Solution

The correct option is B (y2x)
S+32O2SO3;ΔH=2x ... ( i)
SO2+12O2SO3;ΔH=y ... (ii)
Subtract equation (ii) from equation (i)
S+O2SO2;ΔH=(y2x).

Thus, the heat of formation of sulphur dioxide is (y - 2x).

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