need help on both will rate!

A 7.1 mol sample of HBr was placed in a 0.7 L reactor and heated to 1000 C until hydrogen bromide decomposes and the system reached equilibrium as shown in the following reaction: HBr(g) = H2(g) + Brz(g) If Keg for the reaction at this temperature is 4.5x10-3, calculate the concentration of hydrogen (H2) in mg/L. (H=1, Br=80 g/mol). Enter your final answer with 2 decimal places. One of the major reactions for industrial synthesis of sulfuric acid is the reaction between gaseous sulfur dioxide and oxygen: 25O2(g) + O2(g) = 2503 (g) If a mixture of SO2 and O2 was maintained at 500 C until the system reached equilibrium and the equilibrium mixture contained 0.025 M SO2, 0.093 M 02, and 0.108 M SO3, calculate Keq at this temperature. (S=32, O=16 g/mol)