Chapter 6, Problem 66P

Consider the reaction of ${\text{H}}_{\text{2}}(g)+{\text{ F}}_{\text{2}}(g)\stackrel{}{\rightleftarrows }\text{ 2 HF}(g).$ What happens to the concentration of each substance when (a) $[{\text{H}}_{\text{2}}]$ is increased; (b) $[\text{HF}]$ is increased?