Concept explainers
Interpretation: The number of grams of lead chromate formed when
Concept introduction: The reaction between lead nitrate solution and potassium chromate solution is a double displacement reaction. Lead nitrate and potassium chromate solutions exchange their anions resulting in the formation of lead chromate precipitate and potassium nitrate solution. Unitary method is used to first calculate the limiting reagent. From limiting reagent, the mass of product is found again by using the unitary method. A limiting reagent is the reactant that is present in less amount than required for completing the reaction. It is the one that decides the amount of product formed.
Answer to Problem 38A
The number of grams of lead chromate formed when
Explanation of Solution
The reaction between lead nitrate solution and potassium chromate solution is a double displacement reaction. Here is the balanced reaction:
It is given that
Number of moles of
Mass of
Molar mass of
Also,
Molar mass of
From the balanced chemical equation,
Thus,
Available
Thus,
Molar mass of
From the balanced chemical equation,
So,
The number of grams of lead chromate formed when
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