Multiple Choice
In the ionic compound (iron(III) chloride), which ions and how many of each are present in one formula unit?
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5. Molecules and Compounds
Writing Formula Units of Ionic Compounds
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Join thousands of students who trust us to help them ace their exams!Watch the first videoMultiple Choice
Provide the molecular formula for the following compound:Sodium dichromate
A
NaCr2O7
B
Na(Cr2O7)2
C
NaCrO4
D
Na2Cr2O7
E
Na2CrO4
Verified step by step guidance1
Identify the elements present in sodium dichromate: sodium (Na), chromium (Cr), and oxygen (O).
Understand that sodium dichromate is a compound where sodium ions are combined with the dichromate ion (Cr2O7^2-).
Recognize that the dichromate ion (Cr2O7^2-) consists of two chromium atoms and seven oxygen atoms.
Determine the charge balance: Sodium ions (Na^+) have a +1 charge, and the dichromate ion (Cr2O7^2-) has a -2 charge. To balance the charges, two sodium ions are needed for one dichromate ion.
Combine the elements and their respective quantities to form the molecular formula: Na2Cr2O7, which includes two sodium atoms, two chromium atoms, and seven oxygen atoms.
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