Calculate the following:The mass of 0.25 moles of Calcium.
Calculate the actual mass of : (a) an atom of oxygen,
(b) an atom of hydrogen, (c) a molecule fo NH3,
(d) the atom of silver (e) th emolecule fo oxygen (f) 0.25 gram atom of calcium.
Calculate the mass per cent of calcium, phosphorus and oxygen in calcium phosphate Ca3(PO4)2.