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Alex Ar [27]
3 years ago
8

Question

Chemistry
1 answer:
AnnyKZ [126]3 years ago
8 0

Blank #1: Polyatomic

Blank #2: 2 (see explanation)

Blank #3: 1 (see explanation)

<h3>Explanation</h3>

Both the ammonium ion \text{NH}_4^{+} and the sulfate ion \text{SO}_4^{2-} contain more than one atom in each ion. The two species are thus <em>polyatomic</em>. The chloride ion \text{Cl}^{-}, for example, is <em>monoatomic</em>.

Superscripts above formulae of the ions indicate their charge. Each ammonium ion carries a positive one (+1) charge. Each sulfate ion carries a charge of negative two (-2).

Ammonium sulfate is an ionic compound. A sample of this compound contain myriads of ammonium ions and sulfate ions. The ions are packed in three-dimensional lattices. Thus unlike water, ammonium sulfate does not exist as molecules in nature.

Assuming that the second and third blanks refers to a formula unit, rather than a molecule, of ammonium sulfate. The empirical formula of ammonium sulfate gives the minimum whole-number ratio between the two ions in a sample.

Charges shall balance between the two ions. Ammonium ions are of charge +1. Sulfate ions are of charge -2. The sample shall thus contain two ammonium ions for every one sulfate ion.

The empirical formula of ammonium sulfate is therefore (\text{NH}_4)_2\text{SO}_4.

There are thus two ammonium ions \text{NH}_4^{+} and one sulfate ion \text{SO}_4^{2-} in each formula unit of ammonium sulfate.

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