Question

890 g of copper is mixed with 100 g of zinc to form brass. The density of copper is 8.9 g/cm³ and
the density of zinc is 7.1 g/cm³.
a. what is the volume of Copper and Zinc used to make a brass .
b. Calculate the density of the brass .​

Answer 1

Answer:

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

Answer 2

Explanation:

The correct answer is here :- 7.61g