(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called law of conservation of mass.
(b) A group of atoms carrying a fixed charge on them is called polyatomic ion.
(c) The formula unit mass of Ca3 (PO4)2 is (3 × atomic mass of Ca) + (2 × atomic mass of phosphorus) + (8 × atomic mass of oxygen) = 310
(d) Formula of sodium carbonate is Na2CO3 and that of ammonium sulphate is (NH4)2SO4.
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