00:01
So for this problem, we know that there's an atomic mass of some element, x, which is 33 .42 amu, and there's a 27 .22 gram sample of that.
00:14
And i have another element, y, which is unknown amu, and it has an 84 .1 gram sample.
00:28
And these together form a compound, x, y.
00:33
So there's a complicated way to solve this problem and a simpler way to solve this problem.
00:37
And so the simple way to think about this is the multiple ratio of x, y, is going to be 1.
00:44
So, no matter what i have here, the moles of x and the moles of y are always going to be identical.
00:51
And so, let's first calculate how many moles of x here are going to be.
00:56
Well, i know that i have 27 .22 grams of x.
01:02
And if i want to convert that to moles, what do i do? i divide by the molar mass.
01:07
And in this case, that's just going to be the atomic mass of x, which is 33 .42 grams per mole...
