One mole of an ideal gas at 300 K is expanded isothermally from an initial volume of 1 litre to 10 litres. The $\Delta E$ for this process is ($R = 2 cal. mol^{ –1}{ K^–1}$) :

Question

( A ) 163.7 cal.
( B ) 9 lit. atm.
( C ) Zero
( D ) 1381.1 cal.