# One-quarter lbmol of oxygen gas (O_2) undergoes a process from p_1=20(lb_f)/(i n^2), T_1=500^circ R to p_1=150(lb_f)/(i n^2). For the process W = -500 Btu and Q = -152.5 Btu. Assume the oxygen behaves as an ideal gas.

One-quarter lbmol of oxygen gas (O2) undergoes a process from . For the process W = -500 Btu and Q = -152.5 Btu. Assume the oxygen behaves as an ideal gas.
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Given data: Initial Pressure
Initial Temperature ${T}_{1}={500}^{\circ }R$
Final pressure
Work
Heat

Specific heats for oxygen

We know that
$\frac{1}{4}=\frac{m}{32}$

The change in entropy is given by