4.48 Lofan ideal gas at S.T.P requires 12 calories to raise its temperature by `15^(@)C` at constant volume. The `C_(p)` of the gas is:

Options

A. `3 cal mol ^(-1)`
B. ` 4 cal mol ^(-1)`
C. `7 cal mol ^(-1)`
D. `6 cal mol ^(-1)`

Explanation

`C _(V) = ( DeltaU)/( n Delta T), n = ( 4.48)/(22.4) =0.2, C _(V) = ( 12)/( 0.2 xx 15) = 4 cal, C _(P) = C _(V) + R = 4 +2 = 6 cal `