1.

S + (3)/(2)O_(2) rarr SO_(3) + 2x kcal SO_(2) + (1)/(2) O_(2) rarr SO_(3) + y kcal Find out the heat of formation of SO_(2) :

Answer»

2x - y
x + y
2x + y
x - y

Solution :The REQUIRE EQUATION is :
`S + O_(2) rarr SO_(2)`
The given equation are
(i) `S + (3)/(2)O_(2) rarr SO_(2) + 2x KJ`
(ii) `SO_(2) + (1)/(2)O_(2) rarr SO_(3) + y kJ`
Subtracting eqn. (ii) from eqn. (i)
`S + O_(2) rarr SO_(2) + 2x - y`
:. Heat of formation = 2x - y


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