Multiple Choice
Which of the following is the correct chemical formula for chromium(III) sulfide?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for iron(III) oxide?
A
Fe2O3
B
Fe3O2
C
FeO
D
FeO2
Verified step by step guidance1
Identify the oxidation state of iron in iron(III) oxide. The Roman numeral III indicates that iron has a +3 charge, so Fe is Fe^{3+}.
Determine the charge of the oxide ion. Oxygen typically forms an oxide ion with a charge of O^{2-}.
Balance the total positive and negative charges to form a neutral compound. Let the number of Fe^{3+} ions be x and O^{2-} ions be y. The total positive charge is 3x and the total negative charge is 2y.
Set up the charge balance equation: 3x = 2y. Find the smallest whole numbers x and y that satisfy this equation. The smallest integers are x = 2 and y = 3.
Write the chemical formula using these subscripts: Fe_{2}O_{3}.
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