Question

A student placed the same chemical amount of SO2(g) and NO2(g) into a 1.0L container. At equilibrium, the concentration of both SO3(g) and NO(g) was 0.30mol/L. What was the initial concentration of SO2(g) and NO2(g)? Kc= 9.5
SO2(g)+NO2(g)--> SO3(g)+NO(g)