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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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Before going to lab, a student read in his lab manual that the percent yield for a difficult reaction to be studied was likely to be only 40% of the theoretical yield. The student’s prelab stoichiometric calculations predict that the theoretical yield should be 12.5 g. What is the student’s actual yield likely to be?

Interpretation Introduction

Interpretation:

To determines actual yield or observed yield.

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.

Theoretical yield is the amount of product which is theatrically calculates by the amount of limiting agent while the actual yield is the observed amount of product of any reaction.

It is always less than the Theoretical yield because of following reasons:

  1. Some reactants are losing in the experiment condition.
  2. Some time some product also lost in transfer from one container to other container.
  3. Formation of side products.
  4. Sometimes all reactant are not reactant means some reactant is left in un-reacted form.

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%   .

Explanation

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.

The actual yield is the observed amount of product of any reaction. It is always less than the Theoretical 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%   

Given:

Percentage yield = 40 %

Theoretical yield = 12

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