A cylinder with fixed capacity of 67.2 litre contains helium gas at STP. The amount of heat needed to raise the temperature of the gas by $20 ^ { \circ } \mathrm { C }$ is:\\
[Given that $\mathrm { R } = 8.31 \mathrm {~J} \mathrm {~mol} ^ { - 1 } \mathrm {~K} ^ { - 1 }$]\\
(1) 748 J\\
(2) 700 J\\
(3) 350 J\\
(4) 374 J