Calculating Percent Yield for a Chemical Reaction

In summary, stoichiometry is the branch of chemistry that deals with the quantitative relationships between reactants and products in a chemical reaction. It is important in experiments to ensure the correct proportions of reactants are present and can be calculated using the balanced chemical equation and molar ratios. Factors such as experimental errors and changes in reaction conditions can affect the accuracy of correction for stoichiometry. This principle can be applied to all chemical reactions as long as they are balanced and follow the law of conservation of mass.
  • #1
Numnum
19
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Homework Statement



1. If we mix 25 grams of sodium bromide with a large amount of potassium chloride, what will our theoretical yield of sodium chloride be?

2. If our actual yield from this reaction was 18 grams of sodium chloride, what would our percent yield for this reaction be?


The Attempt at a Solution



1. NaBr + KCl ------> NaCl + KBr

MNaBr = 25gNaBr ÷ 102.9gNaBr = 0.243molNaBr
0.243molNaBr x 1molNaCl/1molNaBr = 0.243molNaCl
0.243molNaCl x 58.44gNaCl/1molNaCl
= 14.201g NaCl

2. 14.201/18 x 100 = 78.9%


Is this correct? Thank you!
 
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  • #2
In general too many significant figures, but other than that NaCl mass is OK.

What is definition of the percent yield?

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Related to Calculating Percent Yield for a Chemical Reaction

1. What is stoichiometry in chemistry?

Stoichiometry is the branch of chemistry that deals with the quantitative relationships between the reactants and products in a chemical reaction. It is based on the law of conservation of mass, which states that matter cannot be created or destroyed, only transformed.

2. Why is correction for stoichiometry important in experiments?

Correction for stoichiometry is important in experiments because it ensures that the reactants are present in the correct proportions for a reaction to occur. Without proper correction, the reaction may not proceed as expected and the results would be inaccurate.

3. How do you calculate correction for stoichiometry?

To calculate correction for stoichiometry, you need to determine the balanced chemical equation for the reaction, then use the molar ratios between the reactants and products to convert the given amounts of reactants into the correct amounts of products. This can be done using dimensional analysis or mole-mole calculations.

4. What factors can affect the accuracy of correction for stoichiometry?

The accuracy of correction for stoichiometry can be affected by several factors, such as experimental errors, impurities in the reactants, incomplete reactions, and changes in reaction conditions (temperature, pressure, etc.). It is important to control these factors as much as possible to obtain accurate results.

5. Can correction for stoichiometry be applied to all chemical reactions?

Yes, correction for stoichiometry can be applied to all chemical reactions as long as the reaction is balanced and follows the law of conservation of mass. It is a fundamental principle in chemistry and is used to determine the amounts of reactants needed or products produced in a reaction.

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