Calculate the number of moles of h2 that are present

Question

For the reaction given below at 700°C, K_c =0.534.H₂(g) +CO₂(g) ---> H₂O(g)+ CO(g) (reverse reaction)                        

Calculate the number of moles of H₂ that are present at equilibrium if a mixture of 0.309 moles of CO and 0.309 moles of H₂O is heated to 700°C in a 10.1 L container.