Q8. A total of 48 J heat is given to one mole of helium kept in a cylinder. The temperature of helium increases by $2 ^ { \circ } \mathrm { C }$. The work done by the gas is: Given, $\mathrm { R } = 8.3 \mathrm {~J} \mathrm {~K} ^ { - 1 } \mathrm {~mol} ^ { - 1 }$.\\
(1) 24.9 J\\
(2) 72.9 J\\
(3) 48 J\\
(4) 23.1 J