Two mol of an ideal gas is taken through a reversible cycle as shown in Figure B6. Process $b c$ is an adiabatic expansion, with $p_{b} = 1 \times 1 0^{6} Pa$ and $V_{b} = 1 \times 1 0^{? 3} m^{3}$ . Volume $V_{c} = 7 V_{b}$ . The gas is monatomic. (a) Determine the energy added to the gas as heat in process $ab$ . (8 marks) (b) Determine the energy leaving the gas as heat in process $c a$ . (4 marks) (c) Determine the net work done by the gas through the cycle. (4 marks) (d) Determine the efficiency of the cycle if it is working in a heat engine. (4 marks)

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Two mol of an ideal gas is taken through a reversible cycle as shown in Figure B6. Process

b c

is an adiabatic expansion, with

p_{b} = 1 \times 1 0^{6} Pa

and

V_{b} = 1 \times 1 0^{? 3} m^{3}

. Volume

V_{c} = 7 V_{b}

. The gas is monatomic. (a) Determine the energy added to the gas as heat in process

ab

. (8 marks) (b) Determine the energy leaving the gas as heat in process

c a

. (4 marks) (c) Determine the net work done by the gas through the cycle. (4 marks) (d) Determine the efficiency of the cycle if it is working in a heat engine. (4 marks)

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