Multiple Choice
Which of the following is the correct IUPAC name for CuSO_4?
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3. Chemical Reactions
Naming Ionic Compounds
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Which of the following is the correct chemical formula for manganese(VII) arsenide?
A
MnAs$_2$
B
Mn$_2$As$_7$
C
Mn$_3$As$_7$
D
Mn$_7$As$_2$
Verified step by step guidance1
Identify the oxidation states from the name: manganese(VII) means manganese has an oxidation state of +7, and arsenide typically refers to arsenic with an oxidation state of -3.
Assign the charges to the ions: Mn has a charge of +7 (Mn^{7+}) and As has a charge of -3 (As^{3-}).
Determine the ratio of Mn to As atoms needed to balance the total positive and negative charges so that the compound is electrically neutral.
Set up the charge balance equation: let the number of Mn atoms be x and the number of As atoms be y, then the total charge is 7x + (-3)y = 0.
Solve for the smallest whole number ratio of x to y that satisfies 7x = 3y, which will give the subscripts in the chemical formula Mn_xAs_y.
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