An ore contanins 5% copper. How much ore is requried to obtain 400g of copper?

How much copper can be obtained from 100g of copper sulphate ?

Which is not an ore of copper?

Which is not an ore of copper?

4.5g of an alloy of copper and zinc contains 3.5 g of copper. How much copper will there be in 18.9 g of alloy ?

A ore contains 12% copper how many kilograms of the ore are required to get 69 kg of copper

Write two ores of copper.