JEE Main 2022 · 27 Jul · Shift 2, Chemistry question 83

A gas (Molar mass = 280 g mol$^{-1}$) was burnt in excess $\mathrm{O_2}$ in a constant volume calorimeter and during combustion the temperature of calorimeter increased from 298.0 K to 298.45 K. If the heat capacity of calorimeter is 2.5 kJ K$^{-1}$ and enthalpy of combustion of gas is 9 kJ mol$^{-1}$ then amount of gas burnt is ______ g. (Nearest Integer)