00:02
Hi there.
00:03
In this question, we are trying to determine the empirical formula for a compound that we produce from tin and oxygen.
00:15
So an empirical formula gives us a formula using the smallest whole number ratio of the subscripts.
00:22
In other words, we are trying to find s -n -x -o -y.
00:30
We want to know what x and y are.
00:33
And x and y are going to be a whole number ratio.
00:37
So what we can do is we can determine the whole number, and that would be the smallest whole number ratio.
01:02
Okay, so in this compound, if we determine the smallest whole number mole ratio of tin to oxygen, that would give us our subscripts.
01:10
Well, we are given masses here, but we know that we can convert from mass to moles quite easily by using molar mass.
01:17
So if we have 0 .7 .50 grams of tin in this compound and it contains 0 .201 grams of oxygen, we can convert each of these to moles and then determine that smallest whole number mole ratio between those.
01:34
Let's go ahead and do that.
01:36
To convert from grams to moles, we use molar mess.
01:39
So for tin, there are 118 .7 grams of tin and every one mole of 10.
01:47
And molar mass, remember, comes from the periodic table.
01:51
So i just looked at 10 in the periodic table and found its molar mass there.
01:54
I put the grams in the denominator because i want grams to cancel.
01:58
This gives me 0 .00632 moles of 10...