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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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A 0.4230-g sample of impure sodium nitrate (contains sodium nitrate plus inert ingredients) was heated, converting all the sodium nitrate to 0.2339 g of sodium nitrite and oxygen gas. Determine the percent of sodium nitrate in the original sample.

Interpretation Introduction

Interpretation:

To determine the percentage of sodium nitrate in the original sample.

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 reactants are 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%   

The balance reaction of heating of sodium nitrate is as follows:

2NaNO3(s) Δ2NaNO2(s) + O2(g) 

Given:

Amount of NaNO2 = 0.2339 g

Now calculate the mole of NaNO2 as follows:

Number of moles=mass in gmolarmass=0.2339g68.9953  g/mol=0.00339 moles NaNO2

Now calculate the amount in g NaNO3 as follows:

0

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