True or false. Give a brief explanation for each and if false, provide a counter

Question

True or false. Give a brief explanation for each and if false, provide a counter example.

a. The enthalpy of a system is always greater than its internal energy.

b. In the reversible isothermal expansion of a real gas, the energy remains constant.

c. In the reversible adiabatic expansion of a real gas, the enthalpy always decreases.

d. At a given temperature and volume, the pressure of one mole of a real gas is always less

        than the pressure of one mole of an ideal gas.

e. The work done by a gas in an irreversible expansion from state 1 to state 2 is always less

        than the work done by a gas in a reversible expansion from state 1 to state 2.

Explanation / Answer

a) False. Enthalpy can be equal to internal energy if there is no work

b) true

c)In a reversible adiabatic expansion, there is no work done on the system (adiabatic) and there is no internal energy change, the enthalpy remains constant

d) true

e)False, they are equal.

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