Ok, first off I am *not* asking how to do this problem, I just need a little push in the right direction because I truly have no idea where to even start with these two problems.

In the first I'm given the equilibrium pressures(x and y), and balanced equation of x and y at a given temperature.

The volume is then doubled (no initial or final volume is given) and it asks what the new equilibrium pressures will be. There's fewer moles on one side, so it definitely shifts, I just don't know how to incorporate volume in seeings how the only equation I know to use it with requires moles, which I also don't have.

The second problem (which I have even less clue on) gives a balanced equation and temperature. It then gives the density of the gas mixture/liter at the equilibrium pressure. I need to solve for concentration equilibrium constant (which I know how to do from the pressure constant, but how do I get to the pressure constant?)

Again, I'm just hoping for a little push in the right direction. Thanks in advance for any help!