Multiple Choice
What is the common name of the compound NaCl?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for chromium(III) sulfide?
A
CrS3
B
CrS
C
Cr3S2
D
Cr2S3
Verified step by step guidance1
Identify the oxidation state of chromium in chromium(III) sulfide. The (III) indicates that chromium has a +3 charge, so Cr is Cr^{3+}.
Determine the charge on the sulfide ion. Sulfide (S) typically has a charge of -2, so S is S^{2-}.
To write the correct formula, balance the total positive and negative charges so the compound is electrically neutral. Let the number of chromium ions be x and sulfide ions be y.
Set up the charge balance equation: 3x (from Cr^{3+}) + (-2)y (from S^{2-}) = 0. Solve for the smallest whole number ratio of x to y.
Use the ratio found to write the chemical formula as Cr_{x}S_{y}, which represents the correct formula for chromium(III) sulfide.
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