Question

A real gas within a closed chamber at $27^\circ \text{C}$ undergoes the cyclic process as shown in the figure. The gas obeys $PV^3 = RT$ equation for the path $A$ to $B$. The net work done in the complete cycle is (assuming $R = 8 \, \text{J/mol K}$):

• A. 225 J
• B. 205 J
• C. 20 J
• D. -20 J

Answer 1

Answer: (B)

205 J

Answer 2

We are given that the gas obeys the equation PV³ = RT during the path from A to B , and the process is cyclic.

To calculate the work done in the cycle, we need to analyze the area enclosed by the cycle in the P – V diagram, which represents the work done.

1. Work Done in a Cycle:

The work done in a cyclic process is given by the area enclosed by the cycle on the P – V diagram. The work is the integral of pressure with respect to volume along the path of the cycle.

Since the gas obeys the equation PV³ = RT , the work done can be calculated by finding the area under the curve from A to B and then calculating the work done along the other parts of the cycle.

2. Net Work Done:

By calculating the areas based on the graph provided, the total net work done over the complete cycle is found to be:

W total = 205 J.

Thus, the net work done in the complete cycle is 205 J , and the correct answer is Option (2).