`(Delta H - Delta U)` for the formation of carbon monoxide `(CO)` from its elements at `298K` is
`(R = 8.314 K^(-1)mol^(-1))`

Options

A. `-2477.57 J mol^(-1)`
B. `2477.57 J mol^(-1)`
C. `-1238.78 J mol^(-1)`
D. `1238.78 J mol^(-1)`

Answer

D

Explanation

`C(s)+(1)\(2)O_(2)(g)toCO(g)`
`Deltan_(g)=1-(1)\(2)=1//2`
`DeltaH-DeltaU=Deltan_(g)RT`
`=(1)/(2)xx8.314JK^(-1)mol^(-1)xx298=1238.78 J mol^(-1)`