Question

The mass of a box measured by a grocer’s balance is 2.300 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,
• the difference in the masses of the pieces to correct significant figures?

Answer 1

1. Total mass of the box = 2.300 kg + 20.15 g + 20.17 g

= 2.34032 kg = 2.34 kg. 

2. Difference in the masses of the pieces = 20.17 g – 20.15 g = 0.02 g.