When a \( 60 \, \text{W} \) electric heater is immersed in a gas for \( 100 \, \text{s} \) in a constant volume container with adiabatic walls, the temperature of the gas rises by \( 5^\circ \text{C} \). The heat capacity of the given gas is ________ \( \text{J K}^{-1} \). (Nearest integer)
