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In the reaction S + 3/2 O2 to SO3 2x ...

In the reaction
`S + 3/2 O_2 to SO_3 2x kJ and SO_2 + 1/2 O_2 to SO_3 ykJ`
heat of formationof `SO_2` is

A

`2x + y`

B

`2x - y`

C

`x -y`

D

`x -y`

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