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Question

The heat of formation of SO2 is:

S+32O2SO3+2x kJ
SO2+12O2SO3+y kJ


A
y2x
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B
2x+y
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C
x+y
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D
2xy
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Solution

The correct option is D y2x
S+32O2SO3+2x kJ (eq1)

SO2+12O2SO3+y kJ (eq2)

Now,
Eq(1)Eq(2)

S+32O2SO212O2SO3SO3+(2xy) kJ

S+O2SO2+(2xy) kJ

Hence, heat formation if SO2 is (y2x) kJ

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