(1) Write the balanced chemical equation;
(2) Use the molar mass to convert grams of Al to moles of Al;
(3) Use the molar ratio of Al:I₂ to get the moles of I₂.
Step 1. Write the balanced chemical equation.
2Al + 3I₂ → Al₂I₆
Step 2. Convert mass of Al → moles of Al
Moles of Al =
Step 3. Convert moles of Al →moles of I₂
The molar ratio of Al:I₂ = 2:3
Moles of I₂ =