Question

If one mole of nitrogen molecules weights 28 g calculate the mass of one molecules of nitrogen in grams

Answer 1

Hey mate !
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Given,

Mass of a nitogen molecule, m = 28g

By unitary method :-
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We know,

Molar mass of a substance is a mass of 6.023 x 10^23 molecules.

Molar mass of nitrogen molecule i.e N is ( 2 x 14 )g = 28 g.

Thus 6.023 x 10^23 molecules weigh = 28 g

Therefore, 1 molecule of nitrogen weighs = 28/6.02 X 10^23 = 4.65 X 10^-23 g

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Hope it helps !