Concept explainers
Interpretation:
The compound among TiO2, Fe2O3 and Al2O3 having greatest percentage of oxygen by mass needs to be determined.
Concept introduction:
The percentage of an element in a compound can be calculated as follows:
Percentage of an element in a compound
Answer to Problem 195A
Al2O3 has greatest percentage of oxygen by mass.
Explanation of Solution
Molar mass of TiO2 is 79.866 g/mol.
Molar mass of Fe2O3 is 160 g/mol.
Molar mass of Al2O3 is 102 g/mol.
Now, the mass percent of O in all the compounds will be:
% of O in TiO2
% of O in Fe2O3
% of O in Al2O3
Thus, Al2O3 has largest % of O by mass.
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