## Mass percent composition [ENDORSED]

chrisdinkel_4E
Posts: 33
Joined: Fri Sep 28, 2018 12:17 am

### Mass percent composition

Is mass percent composition simply the percent of each atom in a molecule based on the molar mass of each atom?

Michelle Wang 4I
Posts: 63
Joined: Fri Sep 28, 2018 12:27 am

### Re: Mass percent composition

Yeah, mass percent composition is the percent of how much one element makes up a molecule by weight. For example in H2O, hydrogen makes up about 11% of the molecule.

MaiaRodriguezChoi3E
Posts: 32
Joined: Fri Sep 28, 2018 12:25 am

### Re: Mass percent composition

Yes, mass percentage composition is simply the percentage of the mass of a certain element in a compound. So you take the mass of the element divided by the molar mass of the entire compound and times 100%

Vicky Lu 1L
Posts: 60
Joined: Fri Sep 28, 2018 12:18 am

### Re: Mass percent composition

Mass percent composition is the proportion of an element of that whole molecule. It would be the mass of that element divided by the entire molar mass of a compound.

Chase Yonamine 1J
Posts: 62
Joined: Fri Sep 28, 2018 12:17 am

### Re: Mass percent composition  [ENDORSED]

Mass percent composition is the concentration (mass) of an element in a compound or a component in a mixture. Mass percentage is calculated as the mass of a component divided by the total mass of the mixture, multiplied by 100%. For example, to find the mass percent of Carbon in glucose (C6H12O67) you would take the mass of 6 carbon which is about 72.06g and divide it by the total mass of glucose which is 180.16. The quotient is 0.3999 which should be multiplied by 100% to get the final answer which is 39.99%.