Question

One student burned a piece of paper weighing 4.8 grams. The table below shows the mass of the materials formed by burning the paper.
Ash- 0.1 grams
Smoke- 2.2 grams
Dust- ?
Which is most likely the mass of the dust formed on the burning piece of paper?
A. 2.2 grams
B. 2.3 grams
C. 2.5 grams
D. 2.6 grams

Answer 1

2.5 grams.............

Answer 2

Answer: The correct answer is option C.

Explanation:

Burning of paper produces three products which are ash, smoke and dust. The equation follows:

$\text{Paper}\xrightarrow[]{Heat}\text{Ash + Smoke + Dust}$

Every equation follows Law of Conservation of Mass. This law states that mass can neither be created nor be destroyed but it can only be transformed from one form to another. In a chemical reaction total mass on the reactant side is always equal to the total mass on the product side.

On the reactant side:

Mass of paper = 4.8 grams

On product side:

Mass of ash = 0.1 g

Mass of smoke = 2.2 g

Total mass = 4.8 g

Mass of Dust = 4.8 - ( 2.2 + 0.1) = 2.5 g

Hence, the correct answer is option C.