Film Photographic film contains silver bromide in gelatin....

Film Photographic film contains silver bromide in gelatin. Once exposed, some of the silver bromide decomposes, producing fine grains of silver. The unexposed silver bromide is removed by treating the film with sodium thiosulfate. Soluble sodium silver thiosulfate $\left(\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right)$ is produced. \begin{equation} \mathrm{AgBr}(\mathrm{s})+2 \mathrm{Na}_{2} \mathrm{S}_{2} \mathrm{O}_{3}(\mathrm{aq}) \rightarrow \end{equation} \begin{equation} \quad\quad\quad\quad\quad\quad\quad\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}(\mathrm{aq})+\mathrm{NaBr}(\mathrm{aq}) \end{equation} Determine the mass of $\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}$ produced if 0.275 $\mathrm{g}$ of $\mathrm{AgBr}$ is removed.

Film Photographic film contains silver bromide in gelatin. Once exposed, some of the silver bromide decomposes, producing fine grains of silver. The unexposed
silver bromide is removed by treating the film with
sodium thiosulfate. Soluble sodium silver thiosulfate $\left(\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}\right)$ is produced.
\begin{equation}
\mathrm{AgBr}(\mathrm{s})+2 \mathrm{Na}_{2} \mathrm{S}_{2} \mathrm{O}_{3}(\mathrm{aq}) \rightarrow
\end{equation}
\begin{equation}
\quad\quad\quad\quad\quad\quad\quad\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}(\mathrm{aq})+\mathrm{NaBr}(\mathrm{aq})
\end{equation}
Determine the mass of $\mathrm{Na}_{3} \mathrm{Ag}\left(\mathrm{S}_{2} \mathrm{O}_{3}\right)_{2}$ produced if
0.275 $\mathrm{g}$ of $\mathrm{AgBr}$ is removed.

Key Concepts

Balanced Chemical Equation

A balanced chemical equation accurately represents the substances involved in a chemical reaction along with their stoichiometric ratios. This concept is fundamental to understanding the proportional relationships between reactants and products, which is crucial when calculating the amount of product formed from a given quantity of reactant.

Reaction Stoichiometry

Reaction stoichiometry involves using the mole ratios from a balanced chemical equation to convert between the amount of reactants used and the products produced. It forms the basis for determining quantities in chemical reactions.

Molar Mass Calculation

Molar mass is the mass of one mole of a substance and is used to convert between the mass of a substance and the number of moles. This is essential for performing calculations that connect the mass of reactants or products to their corresponding mole quantities.

Mass-to-Mole Conversions

Converting mass to moles (and vice versa) is a key step in stoichiometric calculations. This process employs the molar mass and is necessary for relating the macroscopic amounts of substances to the microscopic count of entities involved in a reaction.

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