Calculating mass of rxn. mixture at equilibrium. Calculate % yield



 Hydrogen can be extracted from natural gas according to the following reaction: CH4(g) + CO2(g) 2CO(g) + 2H2(g) Kp = 4.5 x 102 at 825 K.

A 85 L reaction container initially contains 22.3 kg of CH4 and 55.4 kg of CO2 at 825 K. Assuming ideal gas behavior, calculate the mass of H2 (in gm) present in the reaction mixture at equilibrium. What is the percent yield of the reaction under these conditions?


I am completely lost. I do noy even know where to start. Please help!!!