Question #12162

find the number of oxygen atoms in 4 grams of O2

Expert's answer

Oxygen in the form O_{2} has a molar mass of 31.9988 g mol^-1. In 4 grams there will be 4/31.9988 mol = 0.1250 mol. One mole of O_{2} equals 6.022 x 10^23 molecules of oxygen, and thereby 7.53 x 10^22 molecules of O_{2} in 4 gram. Since O_{2} is diatomic there are twice as many atoms as there are molecules and the final calculation to determine the number if atoms is 7.53 x 10^22 * 2 = 15.06 x 10^22 atoms of oxygen.

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