You work with the following system:

2X(g) <---> Y(g)

At, equilibrium, [Y]=3[X]. If K=10, calculate the [Y] at equilibrium.

K = (Y)/(X)^2

10 = (3X)/(X)^2
10 = 3X/X^2
Solve for X and convert to Y.

how do u convert for y?

To calculate the concentration of Y at equilibrium, we can use the equilibrium expression and the given information about the equilibrium constant.

The equilibrium expression for the given system is:
K = [Y] / [X]^2

We know that at equilibrium, [Y] = 3[X]. By substituting this into the equilibrium expression, we get:
K = (3[X]) / [X]^2

Simplifying this equation, we have:
K = 3 / [X]

Now, we can rearrange the equation to solve for [X]:
[X] = 3 / K

Substituting the value of K (given as 10), we can calculate the concentration of X at equilibrium:
[X] = 3 / 10 = 0.3

Since the stoichiometric ratio for Y with respect to X is 1:3, we can calculate the concentration of Y at equilibrium by multiplying the concentration of X by 3:
[Y] = 3 * [X] = 3 * 0.3 = 0.9

Therefore, the concentration of Y at equilibrium is 0.9.