16. Ammonia weighing 500 g is at a temperature of 400 K and a pressure of 2 atm. It is transferred to a state at a temperature of 300 K and a pressure of 1 atm. Assuming the properties of the gas are close to the properties of an ideal gas, find the change in the molar and total volume, enthalpy, internal energy and Gibbs energy of the system during this transition.

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