How many atoms of nitrogen are in 10 g of #"NH"_4"NO"_3#?

1 Answer
Nov 10, 2016

Answer:

#5#

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"#, is equal to #6.02xx10^23#.

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"=10/80=0.125#

#N_"A"=0.125xx6.02xx10^23=7.525^23#