   Chapter 4, Problem 100GQ

Chapter
Section
Textbook Problem

The elements silver, molybdenum, and sulfur combine to form Ag2MoS4. What is the maximum mass of Ag2MoS4 that can be obtained if 8.63 g of silver, 3.36 g of molybdenum, and 4.81 g of sulfur are combined? (Hint What is the limiting reactant?)

Interpretation Introduction

Interpretation:

The maximum mass of Ag2MoS4 obtained in the given reaction has to be determined.

Concept introduction:

• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.
• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• Stoichiometric factor is a relationship between reactant and product which is obtained from the balanced chemical equation for a particular reaction.
• Limiting reagent: limiting reagent is a reactant, which consumes completely in the chemical reaction. The quantity of the product depends on this limiting reagent, it can be determined with the help of balanced chemical equation for the reaction.
Explanation

Here the elements silver, molybdenum and sulfur combine to form Ag2MoS4.

From 1 mol Ag2MoS42molAg,1molMoand4molS can be isolated.

Thus, from the amount of each of these elements it is possible to find the amount of Ag2MoS4 as follows,

From silver,

(8.63gAg107.86g/mol)×(1molAg2MoS42molAg)×(439.95gAg2SO41molAg2SO4)=17.6045g

From Mo,

(3.36gMo95.96g/mol)×(1molAg2MoS41molMo)×(439

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