A compound has the formula $$ \text{K}_2\text{Cr}_2\text{O}_...

Question Analysis
This question tests the student's ability to determine the percent composition of an element in a more complex compound.

Key Concept Explanation
The percent composition of an element in a compound is found by dividing the total mass of that element in one mole of the compound by the molar mass of the compound, then multiplying by 100%.

Step-by-step Solution
1. Determine the molar mass of the compound