Question

A gas with an initial temperature of 770℃ undergoes the process shown in (Figure 1).

You may want to review (Pages 367-372).

Part C.

How many moles of gas are there?

Answer 1

\(P_{i} V_{i}=n R T_{i}\)

\(n=\frac{P_{i} V_{i}}{R T_{i}}\)

\(P_{i}=3 \mathrm{~atm}=303975 \mathrm{~Pa}\)

\(V_{i}=300 \mathrm{~cm}^{3}=0.0003 \mathrm{~m}^{3}\)

\(T_{i}=770^{\circ} \mathrm{C}=1043 \mathrm{~K}\)

\(R=8.314 J K^{-1} \mathrm{~mol}^{-1}\)

\(n=\frac{303975 \times 0.0003}{8.314 \times 1043} \mathrm{~mol}=0.01052 \mathrm{~mol}\)