Assuming that the gases are ideal, calculate the amount of work done (in joules) in the following reaction. Is work done on or by the system?

A reaction in the Mond process for purfying nickel(0) tetracarbonyl at 50-100 degrees Celsius. Assume one mole of nickel is used and a constant temperature of 75 degrees Celsius is maintained. Ni(s)+4CO(g) -> Ni(CO)4(g)