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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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When elemental copper is strongly heated with sulfur, a mixture of CuS and Cu 2 S is produced. with CuS predominating.

:math> Cu ( s ) + S ( s ) CuS ( s ) 2 Cu ( s ) + S ( s ) Cu 2 S ( s )

at is the theoretical yield of CuS when 31.8 g of Cu(s) is heated with 50.0 g of S? (Assume only CuS is produced in the reaction.) What is the percent yield of CuS if only 40.0 g of CuS can be isolated from the mixture?

Interpretation Introduction

Interpretation:

To determine the theoretical yield and percentage yield of CuS.

Concept Introduction:

A balanced chemical equation is an equation that contains same number of atoms as well as of each element of reactants and products of reaction.

The limiting reactant in a particular reaction has due to following properties:

  1. Limiting reactant completely reacted in a particular reaction.
  2. Limiting reactant determines the amount of the product in mole.
Explanation

Theoretical yield is also known as calculated yield. Theoretical yield is the amount of product which is theatrically calculates by the amount of limiting agent. It is the maximum amount of product which is formed in any reaction.

Other name of actual yield is observed yield.

The percentage yield is calculated by the actual or observed experimental yield divided by the theoretical yield and multiplied by 100.

The percentage yield can be calculates by the use of following expression:

Actual yield or given yield Theoretical yield or calculated yield ×100%   

Theoretical yield is the greatest amount of a product possible from a reaction, when assume that the reaction goes to 100% competition.

The balance equation for the formation of CuS is as follows:

Cu(s)+S(s)CuS(s)2Cu(s)+S(s)Cu2S(s)

Given:

Amount of Cu = 31.8 g

Amount of S = 50.0 g

Calculation:

Number of moles of Cu and S are calculated as follows:

Number of moles=mass in gmolarmass=31.8 g63.546  g/mol=0.500 moles CuNumber of moles=mass in gmolarmass=50

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