`(DeltaH-DeltaU)` for the formation of carbon monoxide (CO) from its elements at 298 K is `(R=8.314kJ^(-1)" "mol^(-1))`

Options

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

Answer

D

Explanation

(d) For the reaction, `C_((s))+(1)/(2)O_(2(g)) to CO`
`DeltaH=DeltaU+DeltanRT or DeltaH-DeltaU=DeltanRT`
`Deltan=1-(1)/(2)=(1)/(2),DeltaH-DeltaU=(1)/(2)xx8.314xx298`
`=1238.78J" "mol^(-1)`