Cisplatin [Pt(NH3)2 Cl2], a compound used in cancer...

Cisplatin $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right],$ a compound used in cancer treatment, is prepared by reaction of ammonia with potassium tetrachloroplatinate: $$ \mathrm{K}_{2} \mathrm{PtCl}_{4}+2 \mathrm{NH}_{3} \longrightarrow 2 \mathrm{KCl}+\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2} $$ How many grams of cisplatin are formed from $55.8 \mathrm{~g}$ of $\mathrm{K}_{2} \mathrm{PtCl}_{4}$ and $35.6 \mathrm{~g}$ of $\mathrm{NH}_{3}$ if the reaction takes place in $95 \%$ yield based on the limiting reactant?

Cisplatin $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right],$ a compound used in cancer treatment, is prepared by reaction of ammonia with potassium tetrachloroplatinate:
$$
\mathrm{K}_{2} \mathrm{PtCl}_{4}+2 \mathrm{NH}_{3} \longrightarrow 2 \mathrm{KCl}+\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}
$$
How many grams of cisplatin are formed from $55.8 \mathrm{~g}$ of $\mathrm{K}_{2} \mathrm{PtCl}_{4}$ and $35.6 \mathrm{~g}$ of $\mathrm{NH}_{3}$ if the reaction takes place in $95 \%$ yield based on the limiting reactant?

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Key Concepts

Stoichiometry

Stoichiometry is the quantitative relationship between reactants and products in a chemical reaction. It involves using the balanced chemical equation to determine the proportional amounts, in moles, of each substance involved, and then converting those amounts to grams if necessary.

Limiting Reactant

The limiting reactant is the substance that is completely consumed first in a chemical reaction, determining the maximum amount of product that can be formed. Identifying the limiting reactant is crucial as it dictates the theoretical yield of the reaction.

Percent Yield

Percent yield is a measure of the efficiency of a chemical reaction, calculated by dividing the actual yield (the amount of product obtained experimentally) by the theoretical yield (the amount predicted by stoichiometric calculations) and then multiplying by 100. It accounts for real-world inefficiencies in a reaction.

Molar Mass and Unit Conversions

Molar mass is the mass of one mole of a substance, expressed in grams per mole, and serves as a conversion factor between the mass of a substance and the number of moles. This conversion is essential for relating the amounts of reactants and products during stoichiometric calculations.

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