00:02
Okay, so today we're calculating how many chlorine atoms are in a sample of gold chloride.
00:07
So we have the formula of gold chloride, it is au2 -cl6, and we have 70 grams of this sample.
00:18
And so we want to calculate the number of chlorine atoms here, so we're going to need to do some dimensional analysis.
00:23
So first we start with what we know, which is 70 grams of gold chloride.
00:32
And to get into the number of chlorine atoms, we're going to need to use avogadra's number, because that's the only conversion we know that goes from moles into something of particles.
00:42
So we're going to need to get our grams into moles in order to be able to solve this.
00:47
So that's going to be our first step.
00:49
So to do that, we're going to need to know the molar mass of gold chloride.
00:52
So you can calculate this from the periodic table, or you can look it up.
01:01
The molar mass of gold chloride, going to be 303 .33 grams per one mole.
01:18
So now we're in moles of gold chloride, but we're not really interested in just gold chloride.
01:32
We're interested in the chlorine atoms...