Multiple Choice
What is the correct name for BaCl_2?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for mercury(II) nitride?
A
Hg2N3
B
Hg3N2
C
Hg(NO3)2
D
HgN2
Verified step by step guidance1
Identify the oxidation state of mercury in mercury(II) nitride. The (II) indicates mercury has a +2 charge, so Hg is Hg^{2+}.
Determine the charge of the nitride ion. Nitride is the anion of nitrogen with a charge of 3-, so N is N^{3-}.
Balance the total positive and negative charges to form a neutral compound. To balance Hg^{2+} and N^{3-}, find the smallest common multiple of charges: 2 and 3, which is 6.
Calculate the number of Hg and N ions needed to reach a total charge of zero. For Hg^{2+}, 3 ions give +6 charge; for N^{3-}, 2 ions give -6 charge.
Write the chemical formula using the numbers of ions found: Hg_3N_2, which represents mercury(II) nitride.
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