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

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

Key Concept Explanation
Percent composition of an element in a compound is calculated using the formula:
The molar mass of the compound is the sum of the atomic masses of all the atoms in the formula.

Step-by-step Solution
1. Calculate the molar mass of :