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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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hat is meant by the percent composition by mass for a corn pound? Describe in general terms how this information is obtained by experiment for new compounds. How can this information be calculated for known compounds?

Interpretation Introduction

Interpretation:

To determine what is meant by percent composition by mass for a compound and also describe in general terms how this information is obtained by experiment for new compounds. How the percent composition by mass is calculated for known compounds should be described.

Concept Introduction:

The molar mass of any element is the mass of 6.02×1023 atoms or 1 mole of that element. The unit of molar mass is grams.

Mass of any substance can be calculated as follows:

Mass in gram = Number of moles×Molar mass

Percentage by mass of any element in the compound is the amount of that element in the total amount of the compound.

Explanation

Mass percentage:

Mass percentage by mass of any element in the compound is the amount of that element in the total amount of the compound. The mass percentage composition of any element in the given compound can be calculated as follows:

Mass percentage of element = weight of that elementTotal weight of the compound ×100

Formula used:

Mass percentage of element = weight of that elementTotal weight of the compound ×100

For example; the Percentage of nitrogen in NH4NO3 is calculated as follows:

The molar mass of NH4NO3 = 80.04336 g/mol

Mass percentage of N:

% of N = 2×14

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