Caffeine, C8H10N4O2, is a stimulant found in tea and coffee. A sample of the substance was dissolved in 45.0g of chloroform, CHCl3, to give a 9.06102m solution. How many grams of caffeine were in the sample? g N2(g)+O2(g)2NO(g) The equilibrium constant (Kc) is 0.0025 at 2127C. If an equilibrium mixture at this temperature contains 0.019 mol N2 and 0.013molO2 per liter, what is the concentration of NO ? Concentration = M