4. consider a cylinder fitted with a piston that contains 2 mol of h2o in a container at 1000 k. calculate how much work is required to isothermally and reversibly compress this gas from 10 l to 1 l, in each of the following cases: a) use the ideal gas model b) use the redlich-kwong equation (you can use software to solve integration) c) use the steam tables d) compare these three methods.