The mass of a box measured by a grocer’s balance is 2.3 kg. Two gold

1.	The mass of a box measured by a grocer’s balance is 2.3 kg. Two gold pieces 20.15 g and 20.17 g are added to the box.(i) What is the total mass of the box ? (ii) The difference in masses of the pieces to correct significant figures.
Answer» (i) Mass of box = 2.3 kg Mass of gold pieces = 20.15 + 20.17 = 40.32 g = 0.04032 kg. Total mass = 2.3 + 0.04032 = 2.34032 kg In correct significant figure mass = 2.3 kg (as least decimal) (ii) Difference in mass of gold pieces = 0.02 g In correct significant figure (2 significant fig. minimum decimal) will be 0.02 g

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

Answer»

(i) Mass of box = 2.3 kg

Mass of gold pieces = 20.15 + 20.17 = 40.32 g = 0.04032 kg.

Total mass = 2.3 + 0.04032 = 2.34032 kg

In correct significant figure mass = 2.3 kg (as least decimal)

(ii) Difference in mass of gold pieces = 0.02 g

In correct significant figure (2 significant fig. minimum decimal) will be 0.02 g