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# $(\Delta H - \Delta U)$ for the formation of carbon monoxide (CO) from its elements at 298 K is : <br> $(R = 8.314 \; JK^{-1} mol^{-1})$

( A ) $1238.78\; J\; mol^{-1}$
( B ) $-1238.78\; J\; mol^{-1}$
( C ) $2477.57\; J\; mol^{-1}$
( D ) $-2477.57\; J\; mol^{-1}$