00:02
Okay, in this question we are trying to show the calculation of the molar mass for boron tribromide.
00:10
So the first thing we need is the formula for boron tribromide.
00:14
Well, we just see boron so that means just one boron but tribromide means there are three bromines.
00:26
So bbr3 would be our correct formula for this.
00:31
Okay, so that means we need to look at the masses for boron and for bromine.
00:46
Bromine becomes an ion, it is named bromide.
00:49
That's why there's the slight difference in the ending here.
00:52
Okay, so as we look at the periodic table, we can get the molar mass of each of these.
00:56
The molar mass of boron is 10 .81 grams per mole.
01:02
Remember molar mass is the same as the atomic mass numerically.
01:06
It's just that atomic mass is the mass of one atom in amu whereas molar mass is the mass of an entire mole in grams.
01:17
All right, so moles of boron from the formula we see there's only one b.
01:21
So we need to multiply these to give us the mass in one mole of boron tribromide...