Question

Many metals are not found in nature in their elemental form, but inminerals which are a combination of elements. The metal isextracted by various means from these minerals. Sphene is a mineralcontaining titanium (Ti) and has the empirical formula CaTiSiO5.Calculate the proportion by mass of titanium in Sphene. Give youranswer as a percentage to 2 significant figures. You will need toconsult the Periodic Table in Book 4, page 48, to obtain therelative atomic masses of the elements in the mineral.

The proportion by mass of titanium in CaTiSiO5 is