# how many molecules are in 32 grams of oxygen?

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There are indeed 2 moles of atomic oxygen in 32 g, but there is only 1 mole of molecular oxygen. (O2→2×16 = 32, of course).

So the number of molecules is the Avogadro number, 6.02×10^23.

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• 1 mole oxygen atoms is 16 grams. Since oxygen molecules are O2, one mole oxygen molecules is 32 grams, so you have 1 mole oxygen molecules. 1 mole is 6,022 *10^23 (avogadro constant) particles.

So 32 grams of oxygen is 6,022 *10^23 molecules.

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• FW of O= 16.0 g

Given weight = 32.0 g

Avagadro's number = 6.02 * 10^23

30.0 g of O * (16.0 g of O for every 1 mole) or

(30.0 g of O)*(1 mole/16.0g of O)*(6.02*10^23 molecules of O/ 1 mole of O)

And thats how many molecules it would be

(I don't have a calculator on me so I'm unable to figure out the total off hand)

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• 1 mole O2 = 32g O2... molar mass O2

1 mole O2 molecules = 6.022x10^23 molecules O2... avogadros #

right?.. so...

32g O2 x (1 mole O2 / 32g O2) x (6.022x10^23 O2 molecules / mole O2) = 6.022x10^23 O2 molecules.

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• moles = mass / Molecular mass

n = m/MM

n = 32 / 16

n = 2 moles

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