help with hw problem

[aphung1E]

A reaction vessel of volume 0.500 L at 700. K contains 1.20 mmol SO2(g), 0.50 mmol O2(g), and 0.10 mmol SO3(g). At 700. K, Kc 5 1.7 3 106 for the equilibrium 2 SO2(g) 1 O2(g) ∆ 2 SO3(g). (a) Calculate the reaction quotient Qc.

For part a i keep getting the wrong answer can someone show me how to approach this problem

[Ryan Narisma 4G]

Hi! To answer your question, you would first convert all the millimolar quantities to molar quantities using the fact that 1 mol = 1000 millimoles. Then determine the concentration using the volume given. And then calculate the reaction quotient using those concentration. Remember that the reaction quotient is like a test to see whether or not the reaction is at dynamic equilibrium. I hope this helps!