The molar mass of P4 (tetraphosphorus) can be calculated by summing the atomic masses of all the phosphorus atoms in one molecule of P4.
Phosphorus has an atomic mass of approximately 30.97 g/mol. Since there are four phosphorus atoms in a molecule of P4, the calculation is as follows:
Molar mass of P4 = 4 × Atomic mass of P
Molar mass of P4 = 4 × 30.97 g/mol = 123.88 g/mol
Therefore, the molar mass of P4 is approximately 123.88 g/mol.