Question

What is the molar mass of P4O10? This just means to add up the masses of all the atoms in the formula. See the example on the front page.

Answer 1

Calculate from atomic masses:
- P = 30.973762 g·mol⁻¹ → 4 × 30.973762 = 123.895048 g·mol⁻¹
- O = 15.999 g·mol⁻¹ → 10 × 15.999 = 159.990 g·mol⁻¹

Sum: 123.895048 + 159.990 = 283.885048 g·mol⁻¹

Rounded appropriately: 283.89 g·mol⁻¹ (≈ 283.9 g·mol⁻¹).