Question

Given that `(1)/(2)S_(8)(s)+6O_(2)(g)to4SO_(3)(g)`, `DeltaH^(@)=-1590 kJ`
The standard enthalpy of formation of `SO_(3)` is
A. `-1590 kJ mol^(-1)`
B. `-397.5 kJ mol^(-1)`
C. `-3.975 kJ mol^(-1)`
D. `+397.5 kJ mol^(-1)`

Answer 1

Correct Answer - B
`DeltaH_(f)(SO_(3))=` heat of formation of `1` mole
`=(-1590)/(4)-397.5 kJ mol^(-1)`