An empty beaker has a mass of 75.0 g. salt is added to the beaker until it has a total mass of 108.06 g. using the correct number of significant figures, what is the mass of the salt?

a. 33 g

b. 33.1 g

c. 33.06 g

d. 33.060 g

The correct answer is B. 33.1 g
Explanation:
Total mass= 108.06 g
Mass of the beaker= 75.0g
Mass of salt= 108.06 - 75.0g = 33.06g
while adding or subtracting numbers, the rule is:
The last significant digit in the result (33.06g) should correspond to the last significant digit in the least accurate measurement(75.0g).
Round off to significant figures, mass of salt will be= 33.1g

108.06 - 75 = 33.06 g

Currently, this number has 4 significant digit.

We can rounded it up to 33.1 to only 3 significant digits

so i think the answer is B.

Hope this helps