Question

How many moles of N are in 0.203 g of N2O?

Answer 1

To calculate the number of moles of an element in the given mass of a compound, we need to convert mass into moles by using its molecular eight then relate the ratio of the elements.

0.203 g N2O (1 mol / 44.01 g N2O) ( 2 mol N / 1 mol N2O) = 9.23 x 10^-3 mol N

Answer 2

Molar mass N₂O = 14 x 2 + 16 => 44.0 g/mol

1 mole ---------- 44.0 g
moles ------------ 0.203 g

0.203 / 44 => 0.004613 moles

1 mol N2O contains 2 atoms N , therefore:

0.004613 x 2 => 0.009226 moles of N

hope this helps!