Calculate Partial Pressure of Concentration?

you need to get the 49.8g for N2O4 to Molarity (g/L) to you would take 49.8 and divide by the 1.90L container size. That gives you 26.2 M. From there do Kc=products/reactants. Plug in your values and solve for 2NO2. dont forget that NO2 is squared in the Kc=products/reactants though.