A compound has the formula $$ \text{Mg(NO}_3\text{)}_2 $$ . ...

Question Analysis
This question assesses the student's ability to calculate the percent composition of nitrogen in a given compound.

Key Concept Explanation
The percent composition of an element in a compound is calculated using the formula: (Mass of the element in 1 mole of the compound / Molar mass of the compound) × 100%.

Step-by-step Solution
1. Calculate the molar mass of the compound .
Molar mass of Mg = 24.3 g/mol
Molar mass of N in = 2 × 14.0 g/mol = 28.0 g/mol
Molar mass of O in

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