What is the molar mass of diatomic nitrogen (N2)?
The Correct Answer and Explanation is :
The molar mass of diatomic nitrogen (N₂) is approximately 28.02 grams per mole (g/mol).
To understand how we arrive at this value, let’s break it down:
- Atomic Mass of Nitrogen: The atomic mass of a single nitrogen (N) atom is about 14.01 g/mol. This value can be found on the periodic table, where atomic weights are listed for each element.
- Diatomic Molecule: Nitrogen gas (N₂) is composed of two nitrogen atoms bonded together. Therefore, to calculate the molar mass of diatomic nitrogen, you simply need to add the atomic masses of the two nitrogen atoms together: [
\text{Molar Mass of N₂} = 2 \times \text{Atomic Mass of N} = 2 \times 14.01 \, \text{g/mol} = 28.02 \, \text{g/mol}
] - Diatomic Nature of Gases: Many gases, including nitrogen, exist as diatomic molecules under standard conditions (0°C and 1 atm). This means they naturally pair up, forming molecules consisting of two atoms. In the case of nitrogen, this diatomic form is stable and predominant in nature.
- Importance of Nitrogen: Nitrogen is a vital element for life on Earth. It makes up about 78% of the Earth’s atmosphere and is essential for the formation of amino acids, proteins, and nucleic acids. Understanding its molecular form and molar mass is crucial in fields like chemistry, biology, and environmental science.
- Practical Applications: Knowing the molar mass of nitrogen gas is essential for various applications, including stoichiometric calculations in chemical reactions, gas law applications, and environmental assessments.
In summary, the molar mass of diatomic nitrogen (N₂) is 28.02 g/mol, calculated from the atomic mass of nitrogen and its diatomic nature, making it an important concept in chemistry and various scientific fields.