The heats of combustion of carbon monoxide at constant pressure and.at constant volume at `21^(@)C` will differ from one another by (R = 2 cal)

Options

A. 27 cal
B. 54 cal
C. 300 cal
D. 600 cal

Answer

C

Explanation

`(Delta H_(c))_(p)-(Delta HC)_(v)=Delta H-Delta U= Delta` nRT
Combustion of `CO_((g))` is
`CO_((g))+(1)/(2)O_(2(g))rarrCO_(2(g))`
`Delta n=1-(1+(1)/(2))=-(1)/(2)`
`therefore Delta nRT=-(1)/(2)xx2xx300=-300` cal
`Delta H - Delta U=300` cals