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AP Chemistry
4.5 Stoichiometry
4.3 Representations of Reactions
4.2 Net Ionic Equations
IntermediateMCQDrawing RepresentationsMathematicalConceptual18.1k
A single rectangular beaker representing an aqueous reaction mixture. A legend to the right defines four particle types: small open circle = \(\text{Ag}^+\), medium shaded circle = \(\text{Cl}^-\), large open circle with thick border = \(\text{Mg}^{2+}\), and large solid black circle = \(\text{NO}_3^-\). In the liquid solution area of the beaker, there are exactly 4 large open circles with thick borders, exactly 6 large solid black circles, and exactly 2 medium shaded circles, evenly dispersed. At the bottom of the beaker, a solid precipitate is shown as a tightly packed lattice consisting of exactly 6 small open circles and exactly 6 medium shaded circles in alternating contact. No other particles, labels, text, or annotations appear.
Particulate representation of the reaction mixture after \(\text{AgNO}_3\text{(aq)}\) and \(\text{MgCl}_2\text{(aq)}\) reach completion.
A student mixes an aqueous solution of \(\text{AgNO}_3\) with an aqueous solution of \(\text{MgCl}_2\), forming insoluble \(\text{AgCl(s)}\) according to the following balanced equation:

\[2\,\text{AgNO}_3\text{(aq)} + \text{MgCl}_2\text{(aq)} \rightarrow 2\,\text{AgCl(s)} + \text{Mg(NO}_3)_2\text{(aq)}\]

The particulate diagram represents the contents of the beaker after the reaction has gone to completion (solvent water molecules are omitted for clarity).

Based on the representation, what was the ratio of the initial number of moles of \(\text{AgNO}_3\) to the initial number of moles of \(\text{MgCl}_2\) present in the mixture before the reaction occurred?

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