2 Calculate the total number of microstates and the entropy of a system with a volume of 10 m3, which is notionally divided up into 10,000 equal sized compartments and which contains one mole of an ideal monatomic gas. Now calculate the number of microstates and the entropy of the same system if the gas has expanded to fill 20 m3. Calculate the change of entropy for this system assuming the expansion was isothermal.