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

Answer

B

Explanation

`C_((s))+(1)/(2)O_(2(g))rarrCO_((g)),`
`Deltan=1-(1)/(2)=(1)/(2)`
`:. Delta H-DeltaU=DeltanRT`
`=(1)/(2)xx8.314xx298=+1238.78 J mol^(-1)`