A compound has the formula $$ \text{MgCl}_2 $$ . The molar m...

Question Analysis
This question evaluates the student's ability to calculate the percent composition of an element in a compound using the given atomic masses and the formula for percent composition.

Key Concept Explanation
Percent composition is calculated by dividing the total mass of the element in one mole of the compound by the molar mass of the compound, then multiplying by 100%.

Step-by-step Solution
1. Calculate the molar mass of :
Molar mass of Mg = 24.3 g/mol
Molar mass of Cl = 35.5 g/mol
Molar mass of = 24.3 + (2 × 35.5) = 24.3 + 71.0 = 95.3 g/mol
2. Calculate the total mass of chlorine in one mole of

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