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

b..

is the correct one

explanation:

covalent bonds form as valence electrons are shared between two atoms. lewis structures and structural formulas are common ways of showing the covalent bonding in organic molecules. formal charge describes the changes in the number of valence electrons as an atom becomes bonded into a molecule.

there are two significant figures.