Let's see, how else can we represent the moles of compound? Now, whenever you want to find the moles of compound, we basically take our amount in grams divided by the molecular weight of that same compound and we get our moles. So another way of finding or representing moles of compound is simply grams of compound divided by molecular weight. But molecular weight and molar mass mean the same thing. So we simply write molar mass and now we have this, we have Molarity and all we need is to find the Molar mass. Remember, the grams of compound was given initially 2 grams of unknown compound and we can check using our units that this makes sense, grams divided by grams per mole.