
Interpretation: The concept behind the term “counting by weighing” is to be explained.
Concept introduction: This is a useful technique used for determining the quantity of substances in a less tedious way.

Explanation of Solution
To determine: The explanation for the term “counting by weighing”.
The stated concept, “counting by weighing” indicates the number of substances by taking the weight of all the objects and dividing this value by the average mass of a single object.
This technique is very useful in cases where the counting of substances is difficult because of their small size and a higher quantity.
For example, if a bag full of hundreds of marbles is taken and the number of marbles is to be calculated, it is a difficult task. So instead, the overall weight of the bag is divided by the weight of one marble. The number obtained is supposed to be the total number of marbles present in the bag. This is termed as “counting by weighing”.
For the calculation of a specified mass of a substance, the average mass is multiplied by the number of the substance required. The resultant quantity is then weighed. This is termed as counting by weighing.
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Chapter 3 Solutions
CHEMISTRY,AP EDITION-W/ACCESS (HS)
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