A cylinder of fixed capacity of 44.8 litres contains helium gas at standard temperature and pressure. The amount of heat needed to raise the temperature of gas in the cylinder by $20.0^{\circ} \mathrm{C}$ will be :
(Given gas constant $\mathrm{R}=8.3 \mathrm{JK}^{-1}-\mathrm{mol}^{-1}$ )
