00:01
All right, so let's figure out how many grams of nh3 we need to react with 106 .5 grams of hcl to produce some nh4 cl.
00:11
We're going to use a little bit of stochialometry.
00:13
And so we have to do a grams -to -grams problem.
00:17
So the first thing we have to do is convert grams to moles using the molar mass of h -c -l.
00:24
So if we find the mass of an h and the mass of a cl, 36 .46 grams of hcl, is in a mole.
00:38
That gets us to moles.
00:41
Once we're in moles, we can convert from one substance to another.
00:45
We need to know about nh3.
00:47
So now we can go from hcl to nh3 using the mole ratio.
00:52
If moles of hcl is in the top, we need to cancel out moles of hcl.
00:56
That's going to go on the bottom.
00:59
And moles of nh3 are going to go on the top because we want to know about nh3.
01:04
We look at the coefficients, no numbers, so they are ones.
01:08
That's our mole ratio.
01:11
We need to know the grams of ammonia.
01:14
So we need to find the molar mass of ammonia...