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Question
Write the name of the following compound and deduce its molecular mass.
AlPO4
Solution
AlPO4 - Aluminium phosphate
| Molecule | Constituent elements | Atomic mass u | Number of atoms in the molecule | Atomic mass × number of atoms | Mass of the Constituents u |
| AlPO4 | Al | 27 | 1 | 27 × 1 | 27 |
| P | 31 | 1 | 31 × 1 | 31 | |
| O | 16 | 4 | 16 × 4 | 64 |
The molecular mass of AlPO4 = Sum of Constituent atomic masses
(Molecular mass of AlPO4) = (Atomic mass of Al) × 1 + (Atomic mass of P) × 1 + (Atomic mass of O) × 4
= (27 × 1) + (31 × 1) + (16 × 4)
= 27 + 31 + 64
= 122 u
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