 So this question says, figure out what the reaction quotient expression is for this particular reaction equation. So the synthesis of mercury 2 oxide from mercury and oxygen. So it's nice to give you the balanced chemical equation, okay? So reaction quotient, remember, is Qc, and that's going to equal what, the concentration of the products divided by the concentration of the reactants raised to their coefficients, right? But those products and reactants have to be in the gaseous or aqueous phase, right? So if we look here, we see, well, this is liquid, so that's not in gaseous or aqueous. That's gas, so that one will be in there, and that's solid, so that won't be in there, right? So the Qc was the concentration of the products divided by the concentration of the reactants, kind of like that. So what is Qc going to be? So normally we would say the concentration of mercury 2 oxide over the concentration of mercury times the concentration of oxygen, but in this case, there is no products that are gaseous or aqueous, so we just put a 1 there, okay? We don't include mercury in it either, so concentration of O2, like that, so your Qc expression for this particular reaction would only be that, okay? So you just got to remember about the gaseous aqueous thing, so are there any questions on that one? It makes sense, right?