00:02
Hi there.
00:03
The atomic mass for carbon, when we look at the periodic table, the atomic mass, the average atomic mass of one carbon atom is 12 .01 amu.
00:16
So to determine the total mass of carbon in each of these compounds, we need to determine how many carbon atoms there are and multiply that number times the mass of one carbon atom.
00:29
All right.
00:30
So in letter a, we have ch4.
00:35
There is only one carbon atom, and we know that one carbon atom has a mass of 12 .01 amu.
00:49
Therefore, the total mass of carbon in letter a is 12 .01 amu, because there is only one carbon.
01:03
All right, for letter b, we have ch3br.
01:15
Again, in ch3br, the formula shows us there's only one.
01:20
One carbon atom.
01:23
Therefore, we'll just use the calculation from the previous question to conclude that the total mass of carbon in this compound is 12 .01 amu as well, because there's only one carbon atom in the formula.
01:39
All right, let's look at letter c...