 So let's try to solve another equilibrium problem. This time we're going to use concentration quantity just to determine the equilibrium constant. So this problem says, according to this reaction equation, if the amounts of hydrogen gas are 1.8 moles, iodine gas is 1.80 moles, so 1.80 and 1.80 moles. And hydrogen iodide gas is 0.520 moles. And they're all contained in a 1.50 liter container. Calculate kc. So these are equilibrium concentrations, or equilibrium values. So these are amounts. We've got to turn them into concentration units. So notice this is moles, not moles per liter. Does everybody understand what I'm saying? So let's go ahead and convert these to concentration units. So instead of moles here, I'm going to put concentration or molarity. So I'm going to divide this by 1.50 liters of force, 0.20 molar and H2, 1.20 molar and I2, and 0.347 molar HI. So let's write the equation for kc for this problem. Can you guys help me do it? What would it be? Concentration HI squared over the concentration of H2 times concentration by 2. So now what do we do? Well, we just put these values in and figure out what k is. So HI, 0.347. And again, I know I've been counting you since day one to stick in your units and cancel them all out. But k's don't have units. So you don't have to worry about it. HI again, 2, 3 safe fix is 0.0835. You guys get that? OK, can I kill it? Does anybody have any questions on that? No question.