Calculation of Mass of One Molecule

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Joseph Saba
Posts: 154
Joined: Thu Jul 11, 2019 12:16 am

Calculation of Mass of One Molecule

Postby Joseph Saba » Tue Oct 01, 2019 7:36 pm

Calculate the mass, in grams, of one water molecule.

805373590
Posts: 101
Joined: Wed Sep 11, 2019 12:17 am

Re: Calculation of Mass of One Molecule

Postby 805373590 » Tue Oct 01, 2019 7:56 pm

The mass of one mole of water is equal to 2 times the molar mass of hydrogen (2x1.008 g) plus the molar mass of oxygen (16 g) which is equal to 18.016 g. 1 mole of water is equal to 6.022 x 10^23 molecules so to find the molar mass of one molecule of water all you need to do is divide 18.016 by (6.022 x 10^23) which is equal to 2.992 x 10^-23 g

Jada Brown 2H
Posts: 100
Joined: Sat Aug 17, 2019 12:15 am

Re: Calculation of Mass of One Molecule

Postby Jada Brown 2H » Tue Oct 01, 2019 7:57 pm

1 molecule of H2O(1 mole H2O/6.022*10^23 molecules)(18 grams H2O/1 mole)=2.99*10^-23

Claire Stoecklein 1E
Posts: 49
Joined: Sat Jul 20, 2019 12:15 am

Re: Calculation of Mass of One Molecule

Postby Claire Stoecklein 1E » Wed Oct 02, 2019 5:03 pm

Because one mole of H2O is 18.02 grams and one molecule is 1/6.022x10^23 atoms, the mass of one molecule can be calculated by dividing 18.02 by avogadros number.


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