Multiple Choice
Na reacts with element X to form an ionic compound with the formula Na₃X. Based on this information, what is the likely formula for the ionic compound formed between Al and X?
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3. Chemical Reactions
Writing Ionic Compounds
Multiple Choice
What is the formula for rubidium sulfite?
A
Rb2SO3
B
RbSO3
C
Rb2S
D
RbSO4
Verified step by step guidance1
Identify the ions involved: Rubidium (Rb) is an alkali metal and forms a +1 cation (Rb^+). Sulfite is a polyatomic ion with the formula SO3^2- and carries a -2 charge.
Determine the ratio of ions needed to balance the charges: Since rubidium has a +1 charge and sulfite has a -2 charge, you need two rubidium ions to balance the charge of one sulfite ion.
Write the chemical formula by combining the ions in the correct ratio: The formula is Rb2SO3, indicating two rubidium ions for every one sulfite ion.
Verify the charge balance: The total positive charge from two Rb^+ ions is +2, which balances the -2 charge from one SO3^2- ion, resulting in a neutral compound.
Review the options provided: The correct formula, Rb2SO3, matches the first option given in the problem.
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