How many atoms of nitrogen are in 10 g of "NH"_4"NO"_3NH4NO3?

1 Answer
Monzur R.
Nov 10, 2016

55

Explanation:

In order to find out how many atoms we have in a certain amount of a sample, we have to use the Avogadro constant: the number of atoms in one mole, N_"A"NA, is equal to 6.02xx10^236.02×1023.

In order to work out how many moles we have in our sample, we can use the formula "n (moles)"="m (mass)"/"Mr (molar mass)"n (moles)=m (mass)Mr (molar mass).

"n"=10/80=0.125n=1080=0.125

N_"A"=0.125xx6.02xx10^23=7.525^23NA=0.125×6.02×1023=7.52523

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