Multiple Choice
Which of the following is the correct chemical formula for iron(II) nitrate?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for cobalt(III) bromide?
A
CoBr2
B
CoBr3
C
Co2Br3
D
Co3Br2
Verified step by step guidance1
Identify the oxidation state of cobalt in cobalt(III) bromide. The Roman numeral III indicates that cobalt has a +3 charge, written as Co^{3+}.
Determine the charge of the bromide ion. Bromide is a halide ion with a charge of -1, written as Br^{-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral. Since cobalt is +3 and bromide is -1, you need three bromide ions to balance one cobalt ion.
Write the formula by placing the cobalt ion first, followed by the bromide ions with the appropriate subscript to indicate quantity: CoBr_{3}.
Verify that the total positive charge (+3 from Co) equals the total negative charge (3 × -1 from Br), confirming the formula CoBr_{3} is correct.
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