Question

A ball of brass has a mass of 100 g. When put into water, it sinks and displaces 12 cc of water.
Calculate the density of brass.
wichs 150 e in air and 120 g in water. Calaulate its volume and density​

Answer 1

Weight of brass in air = 12.9 g

weight of brass in water = 11.3 g

Weight of water displaced by brass = 12.9-11.3 = 1.6 g

Relative density of copper = 8.9= density of substance/density of water

Density f water = 1 g/cc

So, density of copper = 8.9 g/cc= Mass/ Volume

So, density of zinc = 7.1 g/cc

Volume of alloy = 1.6cc

Mass of copper in the alloy = x

Volume of alloy= Volume of copper + Volume of zinc

1.6=

8.9

x

+

7.1

12.9−x

Solving the above equation, x= 7.61 g