Two moles of helium gas undergo a cyclic process as shown in Fig. 19.2.14. Assuming the gas to be ideal, calculate the following quantitites in this process
(a) the net change in heat energy
(b) the net work done
(c) the net change in internal energy.

Explanation

To solve the problem step by step, we will calculate the three quantities: the net change in heat energy (Q), the net work done (W), and the net change in internal energy (ΔU) for the cyclic process of 2 moles of helium gas.

### Step 1: Calculate the Net Work Done (W)

1. **Identify the Process**: The process consists of three segments: AB, BC, and CA. We will calculate the work done in each segment.
2. **Work Done in Segment AB (W_AB)**:
- For an isochoric process (constant volume), the work done is zero.
- Therefore, \( W_{AB} = 0 \).
...