00:01
To calculate the percent composition of the compound, methyonine, and amino acid in protein, you need to determine the mass of each element in a mole of the compound.
00:21
So when they say calculate the percent composition, they are specifically asking you to calculate the mass percent composition, not the atom percent.
00:31
So we're not going to count up the total number of atoms, and then say five of the ten are carbon, we need to calculate the mass associated with each of the elements.
00:44
So it's easiest to assume that we have a mole of the compound.
00:49
If we have a mole of the compound, then based upon its chemical formula, we have five moles of carbon.
00:58
So we'll calculate the mass of five moles of carbon by multiplying the mass of one mole of carbon, 12 .011 by 5, and we get 60 .055 grams of a mole of the compound is carbon.
01:13
We'll do the same thing to calculate the mass that is hydrogen.
01:17
We have 11 moles of hydrogen.
01:19
One mole of hydrogen is 1 .0079 grams...