True or false. Give a brief explanation for each and if false, provide a counter
ID: 818411 • Letter: T
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.