9. Calculate the percent composition of iron in Fe2O3 a. Step 1:

Step 1: Determine the molar mass of Fe2O3.<br />The molar mass of Fe2O3 is calculated by adding the molar masses of iron (Fe) and oxygen (O) in the compound. The molar mass of Fe is 55.85 g/mol and the molar mass of O is 16.00 g/mol.<br /><br />Molar mass of Fe2O3 = (2 * 55.85 g/mol) + (3 * 16.00 g/mol) = 159.69 g/mol<br /><br />Step 2: Calculate the percent composition of iron in Fe2O3.<br />To find the percent composition of iron in Fe2O3, we need to divide the total mass of iron in the compound by the molar mass of Fe2O3 and then multiply by 100.<br /><br />Percent composition of iron = (Total mass of iron / Molar mass of Fe2O3) * 100<br /><br />Percent composition of iron = (2 * 55.85 g/mol / 159.69 g/mol) * 100 ≈ 70.00%<br /><br />Answer: The percent composition of iron in Fe2O3 is approximately 70.00%.