Question

The mass of a box measured by a grocer's balance is 2.3 kg. Two gold pieces of masses 20.15 g and 20.17 g are added to the box. What is the total mass of the box and the difference in the masses of the pieces to correct significant figures?

(b) 234 kg, 0 g 

(b) 2.3 kg, 0.02 g

(c) 2.34 kg, 0.02 g 

(d) 2.3 kg, 0 g

Answer 1

Correct option (b) 2.3 kg, 0.02 g

Explanation :

Total mass = 2.3 kg + 0.02015 kg + 0.02017 kg = 2.34032 kg = 2.3 kg

Difference of mass of the gold pieces = 20.17 g - 20.15 g = 0.02 g