How many oxygen molecules are present in 10g of oxygen gas
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Atomic mass O is 15.9994.
Molar mass of O2 =2 X 15.9994=31.99880 g/mole.
10 g X 1 mole/31.99880 g X 6.022 X 10^23 atoms/mole =
188194557295898596197357 atoms in 10 grams O2.
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How many molecules are present in 16 g of oxygen?
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GSENVIRO eNotes educator| CERTIFIED EDUCATOR
Oxygen is an element and elements have atoms. Oxygen gas is a compound consisting of molecules of oxygen, with each molecule consisting of two oxygen atoms (chemically represented as O_2 ). The molecular weight of oxygen gas is 32 (= 2 x 16) gm/mole.
Now, each mole of a substance contains an Avogadro's number (or, 6.023 xx 10^(23) ) of particles. In other words, 1 mole of oxygen would contain 6.023 xx 10^(23) molecules. Here, we are given with 16 g of oxygen. The number of molecules in 16 gm of oxygen are 0.5 (= 16/32 moles).
Thus the number of molecules in 16 gm or 0.5 mole of oxygen gas are 0.5 x 6.023 x 10^(23) = 3.012 x 10^(23) molecules.
Similarly, 16 gm of elemental oxygen (represented as O) would contain 1 mole of atoms, since the atomic mass of oxygen is 16 and hence will have 6.023 x 10^23 atoms.