A quantity of monoatomic gas undergoes a process in which pressure is changed linearly with volume. The pressure and volume are changed from initial value $\left(\mathrm{P}_{\mathrm{o}}, \mathrm{V}_{\mathrm{o}}\right)$ to final value $\left(3 \mathrm{P}_{\mathrm{o}}, 3 \mathrm{~V}_{\mathrm{o}}\right)$. The heat absorbed by the gas during process is