00:01
For this problem, we're asked which has the greater mass of copper.
00:13
11 .0 grams of copper 1 oxide or 12 .6 grams of copper 1 sulfide.
00:28
So i've got this and this.
00:32
To do this, we're going to figure out a percent composition of these, and i'm going to quick run and find my molar mass of each.
00:41
I might just get to a periodic table for this one to be quicker.
00:48
I usually have one open, so i apologize.
00:51
Ooh, that's not a very good one.
00:52
Where's my p table? there we go.
01:02
So copper we're going to be using, let's do, let's do this one first.
01:14
Cu2o.
01:16
For cu and o, i have two of these.
01:21
I have one of these.
01:22
Multiply and multiply.
01:23
Copper 63 .55 and oxygen is 16 .00 equals equals add together.
01:40
Let me just sit quietly and do my math.
01:59
Now to find my percent copper i'm simply going to take 127 .10 divided by 143 .10 and i don't really even need to do the times 100 part...