How many molecules are there in 122 grams of NO_2?

1 Answer
anor277
Nov 14, 2015

Molecular mass of nitric oxide is 46.1 g. So number of molecules = (122*g)/(46.1*g) xx N_A. N_A is Avogadro's number.

Explanation:

Avogadro's number, N_A = 6.02214 xx 10^23. It is a fact that if I have Avogadro's number of hydrogen atoms (i.e. ""^1H atoms) I have a 1 g mass precisely. So your answer is (122*g)/(46.1*g) xx N_A molecules (pretty large but not infinite). If I asked for the number of nitrogen atoms how many would I have? If I asked for the number of oxygen atoms how many would I have? And what if I asked for the total number of atoms?

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