Question

Silver jewellery is a mixture of silver and copper.If an earing of mass 1.78g is 80.1% silver, the mass of copper in the earing is?

Answer 1

Answer:

Percentage of copper in the earing = (100.0-80.1)% = 19.9%

Now,  mass of copper = (total mass of earing) × 19.9% of copper

                                     = 1.78g × 19.9/100 = 0.35422 g