# How do you calculate the number of moles in 0.135 grams of #HNO_3#?

##### 2 Answers

or

#### Explanation:

In order to calculate the moles in 0.135 grams of

We begin by finding the molar mass of

Now we can use a conversion factor to convert

grams to moles

or

Assume that:

n = number of moles

m = mass of substance

M = molar mass

0.135 grams (m) of

Now you need to find the molar mass (M). If you look closely at the compound formula, you can see that Hydrogen, Nitrogen and Oxygen are present. The molar mass of: Hydrogen is 1.0 g/mol, Nitrogen is 14.0 g/mol and Oxygen 16.0 g/mol.

Therefore, the molar mass of

Looking back at the

the number of moles (n) present is:

Note: Answer rounded to 3 significant figures.