 Okay, so now this one wants us to tell it the molecular weight of carbon disulphide. So remember the atomic weights you got from the periodic table. We can do the same with the molecular weight. So let's just look at our periodic table here. It says solver's atomic weight is 32.066 and we'll use Dalton. It says carbon's is 12.011. So how do I figure out what the molecular weight is? So the molecular weight is going to equal the atomic weight, so 3 after the decimal point. So that's how much one molecule of carbon disulphide plays. So that's how you do molecular weight.