For an ideal gas, $\mathrm{R}=\frac{2}{3} \mathrm{C}_{\mathrm{v}}$. This suggests that the gas consists of…
For an ideal gas, $\mathrm{R}=\frac{2}{3} \mathrm{C}_{\mathrm{v}}$. This suggests that the gas consists of molecule, which are $[\mathrm{R}=$ universal gas constant $]$
polyatomic
diatomic
monoatomic
a mixture of diatomic and polyatomic molecules
Solution
For an ideal gas
$\begin{aligned}
& C_v=\frac{f}{2} R \\
& \text { Or } R=\frac{2}{f} C_v
\end{aligned}$
Hence, $\mathrm{f}=3$
Thus, gas is monoatomic.
.