# Consider the following equilibrium: 2H_2(g) + X_2(g) rightleftharpoons 2H_2X(g) + Delta. What will an addition of X_2 to this system cause to happen?

An increase in the amount of $2 \text{H"_2"X}$ formed at equilibrium compared to before.
By adding more ${\text{X}}_{2}$, you are adding more reactants, shifting the equilibrium to the right, as there are now reactants than products,and equilibrium has not been reached, mor $2 {\text{H}}_{2}$ will react with the excess ${\text{X}}_{2}$ to decrease the amount of reactants and increase the amount of products until equilibrouk is reached.