Question

A piece of brass when immersed in water taken in a Eureka can displaces 27 mL of water. Its mass is 243 g. Find the density of brass in kg/m3​

Answer 1

Answer:

7.61g

Explanation:

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 = 1g/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=  x/8.9  + 12.9−x  / 7.1  

Solving the above equation, x= 7.61 g