A sample of nitrogen gas has a mass of 92.2 grams. How many mole of nitrogen gas are in the sample?

Answer 1

Nitrogen gas is a diatomic gas, meaning that as a gas it is composed of 2 nitrogens. (Other diatomic gasses include oxygen gas, fluorine gas, and chlorine gas.

The molar mass of a diatomic gas is therefore twice of the original element.

1. molar mass of N₂(g) = 2 x 14.0067 g = 28.0134 g.
2. to find moles from grams, the equation is: moles = grams/molar mass
3. 92.2 g/ 28.0134 g = 3.29 moles N₂(g)