Fill in the following blanks with suitable words:
(a) In water, the proportion of oxygen and hydrogen is …….. by mass.
(b) In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called ………… .
(a) 8:1, whatever be the source of water, it will always contain 1:8 ratio of Hydrogen and oxygen respectively.
(b) Law of conservation of mass.