Three moles of an ideal monoatomic gas undergoes a cyclic process as shown in the figure. The temperature of the gas in different states marked as 1,2,3 and 4 are 400 K, 700 K, 2500 K and 1100 K respectively. The work done by the gas during the process $1 -2 -3 -4 -1$ is (Universal gas constant R)
