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The equilibrium constant expressed using the partial pressures of gases is Kp. It works exactly like Kc, except we use partial pressure instead of concentration. Kp = [partial pressure of products]^m / [partial pressure of reactants]^n, where m and n are
The general expression of equilibrium constant is Keq = [concentration of products]^n / [concentration of reactants]^m, where n and m are the stoichiometric coefficients for that species. In this problem,
H2 + Cl2 -> 2 HCl
So you have a right triangle. The base can be called 'x', and the height can be called 'x+5', since it's 5 units longer than the base. The formula for the area of a triangle is
A = (1/2)(b)(h)
so we can rewrite that using our information as:
52 = (1/2)(x)*(x+5)