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

1.	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 (a) the total mass of the box,(b) the difference in the masses of the pieces to correct significant figures?
Answer» (a) Total mass of the box = (2.3 + 0.0217 + 0.0215) kg = 2.3432 kg. Since the list number of significant figure is 2, therefore,the total mass of the box = 2.3 kg. (b) Difference of mass =(2.17 -2.15) = 0.02 g. Since there are two significant figures so the difference in masses to the correct significant figures is 0.02 g.

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 (a) the total mass of the box,(b) the difference in the masses of the pieces to correct significant figures?

Answer»

(a) Total mass of the box = (2.3 + 0.0217 + 0.0215) kg

= 2.3432 kg.

Since the list number of significant figure is 2, therefore,the total mass of the box = 2.3 kg.

(b) Difference of mass =(2.17 -2.15) = 0.02 g.

Since there are two significant figures so the difference in masses to the correct significant figures is 0.02 g.