a. The first law of thermodynamics can be represented by the expression: U = q + W.

a. The first law of thermodynamics can be represented by the expression: ΔU = q + W. State what is meant by all the symbols in this expression.
b. Figure 19.18 shows a fixed mass of gas that undergoes a change from A to B and then to C.
i. During the change from A to B, 220 J of thermal energy (heat) is removed from the gas. Calculate the change in the internal energy of the gas.
ii. During the change from B to C, the internal energy of the gas decreases by 300 J. Using the first law of thermodynamics explain how this change can occur.

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5 - A 0 1 2 3 Volume / 10-4 m3 Figure 19.18 Pressure / 105 Pa n + m c - O