Multiple Choice
Which of the following is the correct IUPAC name for Au2O3?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for ruthenium(IV) oxide?
A
RuO2
B
RuO4
C
Ru2O3
D
Ru2O4
Verified step by step guidance1
Identify the oxidation state of ruthenium in ruthenium(IV) oxide. The Roman numeral IV indicates that ruthenium has a +4 charge, written as Ru^{4+}.
Recall that oxygen almost always has an oxidation state of -2 in oxides, written as O^{2-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral.
Set up the charge balance equation: if there is 1 Ru^{4+} ion, then the number of O^{2-} ions needed is such that the total negative charge equals +4. Let the number of oxygen atoms be x, so 4 + (-2) * x = 0.
Solve for x: 4 - 2x = 0, which gives x = 2. Therefore, the formula is RuO_2, where one ruthenium ion balances two oxide ions.
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