Ideal Gas Questions

A container has two chambers of volumes $V_1=2\text{litres}$ and $V_2=3\text{litres}$ separated by a partition made of a thermal insulator. The chambers contains $n_1=5$ and $n_2=4$ moles of ideal gas at pressures $p_1=1\text{atm}$ and $p_2=2\text{atm}$, respectively. When the partition is removed, the mixture attains an equilibrium pressure of:

During an isothermal expansion, a confined ideal gas does $-150\text{J}$ of work against its surrounding. This implies that:

At $10^{\circ }\text{C}$, the value of the density of a fixed mass of an ideal gas divided by its pressure is $x$. At $110^{\circ }\text{C}$, this ratio is: