if one mole of oxygen atom weights 16 grams,what is the mass (in grams) of one atom of oxygen?

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Solution

We are given that mass of one mole of oxygen atom is 16g. Now one mole of a substance contains 6.023 X 10²³ particles. Therefore, 16g of oxygen will consist of 6.023 X 10²³ atoms of oxygen. Thus
mass of 6.023 X 10²³ atoms of oxygen = 16g
mass of one atom of oxygen = (16 / 6.023 X 10²³)g
= 2.656 X 10^-23 g

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