If a container has 90 grams of nitrogen gas, Nz, how many moles of gas

are in the container?

3.21 moles

Explanation:

First, let us calculate the molar mass of N2.

This is illustrated below:

Molar Mass N2 = 2x14 = 28g/mol

Mass of N2 from the question = 90g

Number of mole of N2 = ?

Number of mole = Mass / Molar Mass

Number of mole of N2 = 90/28

Number of mole of N2 = 3.21 moles

Therefore, there are 3.21 moles of N2 in the container