A mixture of 1374 g of h2 and 7031 g of br2 is heated in a

Question

A mixture of 1.374 g of H2 and 70.31 g of Br2 is heated in a 2.00-L vessel at 700 K. These substances react as follows:
H2 (g) + Br2 (g) ⇔ 2HBr (g)
At equilibrium the vessel is found to contain 0.566 g ofH2.

(a) Compute the equilibrium concentrations of H2,Br2, and HBr.
(b) Compute Kc.