1. The problem statement, all variables and given/known data A sample containing 3.65 mol of a monatomic ideal gas is heated from 289K to 458K, and the entropy remains constant. If the initial volume of the sample was 0.0980m^2, by what factor did the pressure increase or decrease during this process? 2. Relevant equations 3. The attempt at a solution it's isentropic. use the formula to get volume and then substitute it into ideal gas formula? would love some hints please!