Question

Calculate the mass of $1$ molecule of Nitrogen gas.

Answer 1

Hint: Mass of a molecule is molecular mass. The molecular mass of a substance is the average masses of the atoms in one molecule of a substance.

Complete step by step answer:
The mass of one molecule of Nitrogen gas.
i.e. Mass of one molecule of ${N_2}$ gas is:
molecular mass of ${N_2} = 14 \times 2 = 28amu$

Additional information:
1. ${N_2}$ is a colourless odourless gas. Nitrogen is important to the chemical industry. It is used to make fertilisers, nitric acid, nylon, dyes and explosives. To make these products, nitrogen must first be reacted with hydrogen to produce ammonia.
2. The atomic number of nitrogen is $7$. It is a neutral atom that has the same number of electrons and protons. Thus, the electronic configuration of nitrogen will include seven electrons which are placed into the appropriate $s$ and $p$ orbitals in the ground state (i.e. the lowest state of energy). The full electronic configuration for nitrogen is $1{s^2}2{s^2}2{p^3}$.
3. Nitrogen atom contains seven electrons and seven protons. As we know that, the atomic mass is the sum of the number of protons and electrons, thus the atomic mass of nitrogen is $\left( {7 + 7} \right)14$.
4. Nitrogen gas is a diatomic molecule of ${N_2}$. The two nitrogen atoms in the nitrogen molecule are linked or attached to each other by three covalent bonds (i.e. a triple bond).
5. Since, all the electrons are paired thus, nitrogen is a diamagnetic molecule.
6. ${N_2}$ has a free electron pair and can donate these to act as a Lewis base.

Note: The dinitrogen $\left( {{N_2}} \right)$, at standard temperature and pressure, forms about $78\% $ of earth’s atmosphere thus making it the most abundant uncombined element. Moreover, ${N_2}$ is an inert gas and it is not toxic.