5. States of matter question bank (Chemistry)

$A$ container contains a mixture of $He$ and $Ne$ gases at a certain temperature. $He$ is $20 \%$ by mass of the mixture. What is the ratio of the partial pressure of $He$ to $Ne$?

Calculate the compressibility factor $(Z)$ of $1 \text{ mole}$ of a certain real gas if it occupies $0.4 \text{ dm}^3$ at $300 \text{ K}$ and $40 \text{ atm}$. [Given: $R = 0.082 \text{ dm}^3 \text{ atm K}^{-1} \text{ mol}^{-1}$]