Question

How many moles of NO3 are there in 6.2g?

Answer 1

Answer : The number of moles of $NO_3$ is, 0.1 moles

Solution : Given,

Mass of $NO_3$ = 6.2 g

Molar mass of $NO_3$ = 62 g/mole

Now we have to calculate the moles of $NO_3$.

$\text{Moles of }NO_3=\frac{\text{Mass of }NO_3}{\text{Molar mass of }NO_3}=\frac{6.2g}{62g/mole}=0.1moles$

Therefore, the number of moles of $NO_3$ present in 6.2 g is, 0.1 moles

Answer 2

6.2 divided by the mass number of NO3 is 0.1 moles. Anytime your trying to find the moles of something you divide it by the mass number of your combined elements.