How Do You Find the Molar Mass of Phosphorus?

To find the molar mass of phosphorus, you need to consider the form in which it exists, as phosphorus typically exists as a molecule of four phosphorus atoms (P₄). Here's how to calculate it:

1. Identify the Chemical Formula: Phosphorus most commonly exists as a tetratomic molecule, P₄.

2. Find the Atomic Mass of Phosphorus: Look up the atomic mass of phosphorus (P) on the periodic table. It is approximately 30.97 grams/mol.

3. Calculate the Molar Mass: Since the molecule is P₄, multiply the atomic mass of phosphorus by 4.

   Molar Mass of P₄ = 4 * 30.97 g/mol = 123.88 g/mol

Therefore, the molar mass of P₄ is approximately 123.88 grams per mole. If you are asked for the molar mass of a single phosphorus atom, it is simply the atomic mass: 30.97 g/mol. The question is likely asking about P₄, however.