교과서 질문
The elements in red in the periodic table can form cations having more than one charge. Write the formulas and names of the compounds that are formed between the red cations and the blue anions depicted in the periodic table.
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5. Molecules and Compounds
Writing Formula Units of Ionic Compounds
Multiple Choice
In the ionic compound (iron(III) chloride), which ions and how many of each are present in one formula unit?
A
1 ion and 3 ions
B
1 ion and 3 ions
C
1 ion and 3 ions
D
3 ions and 1 ion
검증된 단계별 안내1
Identify the chemical formula given: FeCl\_3, which is iron(III) chloride. The Roman numeral III indicates the oxidation state of iron in this compound.
Determine the charge on the iron ion. Since it is iron(III), the iron ion has a charge of +3, written as Fe\^{3+}.
Determine the charge on the chloride ion. Chloride ions always have a charge of -1, written as Cl\^{-}.
Use the formula FeCl\_3 to find the ratio of ions. There is 1 iron ion and 3 chloride ions in one formula unit.
Confirm that the total positive charge balances the total negative charge: 1 Fe\^{3+} ion contributes +3 charge, and 3 Cl\^{-} ions contribute 3 × (-1) = -3 charge, resulting in a neutral compound.
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