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Question
Write the name of the following compound and deduce its molecular mass.
MgCl2
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Solution
MgCl2 - Magnesium chloride
| Molecule | Constituent elements | Atomic mass u | Number of atoms in the molecule | Atomic mass × number of atoms | Mass of the Constituents u |
| MgCl2 | Mg | 24 | 1 | 24 × 1 | 24 |
| Cl | 35.5 | 2 | 35.5 × 2 | 71 |
The Molecular mass of MgCl2 = Sum of Constituent atomic masses
(Molecular mass of MgCl2) = (Atomic mass of Mg) × 1 + (Atomic mass of Cl) × 2
= (24 × 1) + (35.5 × 2)
= 24 + 71
= 95 u
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