00:01
So for this problem, in order to calculate the percent mass of each element, we need to first determine each element.
00:06
So that's each capital letter.
00:07
So c, h, o, and n.
00:11
If we look on the periodic table, we can find the mass of each.
00:14
So the carbon mass is 12 .01.
00:18
The mass of hydrogen is 1 .01.
00:21
The mass of oxygen is 16.
00:22
The mass of nitrogen is 14 .01.
00:25
Then we're going to multiply them by the subscripts.
00:28
So how many of them are.
00:30
In it.
00:31
If there is no subscript, we assume it's one.
00:33
So there are five carbon, so we'll multiply this by five.
00:36
So 12 .01 times five gives us 60 .05.
00:44
For hydrogen, there are nine of them.
00:46
Therefore, we'll multiply this by nine to give us 9 .09.
00:51
Oxygen, there are two of them, so we'll multiply by two, which gives us 32.
00:56
And nitrogen, since there is no subscript, we're going to multiply by one.
01:00
And we'll just stay the same, which is 14 .01.
01:04
So then to find the percent, the mass percent, we have to first know what the total compound weighs.
01:10
So now we're going to add up all these values.
01:13
So 60 .05 plus 9 .09 plus 32 plus 14 .01...
