A piece of brass (Cu and Zn) weighs 12.9 g in air. When completely immersed in water, it weights 11.3 g. The relative densities of Cu and Zn are 8.9 and 7.1 respectively. Calculate the mass of copper in the alloy

A piece of brass (Cu and Zn) weighs 12.9 g in air. When completely imm

1.	A piece of brass (Cu and Zn) weighs 12.9 g in air. When completely immersed in water, it weights 11.3 g. The relative densities of Cu and Zn are 8.9 and 7.1 respectively. Calculate the mass of copper in the alloy
Answer» `6.6gm` `7.6gm` `8.6gm` `5.6gm` ANSWER :B