A 0.6-mol sample of an ideal polyatomic gas is at an initial temperature of 294 K. The gas undergoes an isovolumetric process acquiring 493 J of energy by heat. It then undergoes an isobaric process losing this same amount of energy by heat. How many joules of work were done on the gas? (The value of the Boltzmann constant is 1.38 10-23 J/K, whilst that of the universal gas constant is 8.314 JKmol.)