Question

A piece of chalk, has an initial mass of 43. 5 grams. The mass of the chalk decreased to 39. 6 grams after use. Which of these is the closest value to the amount of chalk used?.

Answer 1

Quantity of matter measured to know the weight is called mass, it can be measured in kilograms, grams and many other units. The mass of chalk used is 3.9 g.

What is mass?

Chalk is made up of calcium carbonate $(\rm CaCO_{3})$ and has some amount of weight called mass.

Given,

• The initial mass of chalk = 43.5 gm
• The final mass of chalk = 39.6 gm

The total amount of the chalk used is calculated as:

Mass used = Initial mass - final mass

Substituting values in the above formula:

$\begin{aligned}\text{Mass used} &= \text{Initial mass - final mass}\\\\&= 43.5 - 39.6 \\\\&= 3.90\;\rm gm\end{aligned}$

Therefore, 3.9 gms of chalk is used.

Learn more about mass here:

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