00:02
Hi there.
00:03
In this question, we are given this balanced equation, and balanced equations are necessary when we're trying to convert from information about one substance in equation to information about another.
00:15
And the reason it's important is because the coefficients in the balanced equation give us the mole ratio.
00:22
In other words, we see these coefficients are two.
00:26
There's nothing written in front of the oxygen, so it's understood it's a one to two.
00:30
So what that means is that two moles of hydrogen will react with one mole of oxygen to produce two moles of water.
00:45
In other words, it's the mole ratio.
00:46
It's also the molecule ratio.
00:48
It shows you that two molecules of hydrogen would react with one molecule of oxygen and make two molecules of water.
00:55
But for this problem, we're interested in moles.
00:57
So moles are just a multiple of molecules.
00:59
So that same ratio holds up.
01:03
So we have a 2 to 1 to 2 ratio.
01:06
So we can use that to help us convert from one substance to another.
01:11
In this case, we are starting with 1 .4 moles of the hydrogen gas...