The percent composition of Mg in MgCl2 is 25.529%.
The correct formula for magnesium chloride is MgCl2.
To determine the percent composition of Mg, divide the molar mass of Mg by the molar mass of MgCl2 and multiply by 100% .
M Mg:
24.305 g/mol
(atomic weight of periodic table in g/mol)
MMgCl2:
(24.305g/mol Mg)+(2×35.45g/mol Cl)=95.305 g/mol
Percent composition of Mg% Mg=24.305g/mol
95.205g/mol × 100%=25.529% Mg
The percent composition of Mg in MgCl2 is 25.529%.
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