00:01
To find the percent composition assisting, first we need to find the molecular formula, which we get using the color key that we're given.
00:10
There are three carbon atoms.
00:17
One, two, three, four, five, six, seven hydrogen atoms, two oxygens.
00:23
Those are in red, one nitrogen in blue, and one sulfur in yellow.
00:30
So that's our molecular formula.
00:31
Next we need the molar mass, which we find using our periodic table and the subscripts of each element.
00:45
So the molar mass is 3 times 12 .01.
00:56
That's carbon plus 7 times hydrogen, 2 times that of oxygen, 1 for nitrogen, 1 for nitrogen, and 1 for sulfur, which is 32 .07...