6. The temperature of a monoatomic ideal gas is increased from 330 to 600 K. What is the change in molar entropy of the gas (a) if the volume is held constant and (b) if the pressure is held constant?

Calculate the change in the entropies of the system and the surroundings, and the total change in entropy, when the volume of a sample of argon gas of mass 21 g at 298 K and 1.50 bar increases from 1.20 dm3to 4.60 dm3 in (a) an isothermal reversible expansion, (b) an isothermal irreversible expansion against pex = 0, and (c) an adiabatic reversible expansion. Please try to write as clear as possible

Above and to the right of the critical point is a phase called the supercritical fluid, which is where separate phases do not coexist. Select one: O True False

(a) Derive the change in the entropy for adiabatic reversible expansion of a diatomic ideal gas from V₁ to V₁, starting with the Tinitial temperature (neglect the temperature dependence of the heat capacity). (b) Verify that the same entropy change is obtained if the gas is first expanded reversibly and isothermally the final volume followed by (reversible) cooling at constant V.