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In the reaction, S + 3//2 O2 rarr SO3 +...

In the reaction, `S + 3//2 O_2 rarr SO_3 + 2x kJ and SO_2 + 1//2 O_2 rarr SO_3 + y kJ`.Heat of formation of `SO_2` is:

A

x+y

B

x-y

C

2x-y

D

2x+y

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