The ratio of hydrogen and oxygen in water is 1:8 by mass, find out their ratioby number ofatoms, in one molecule of water. (Atomic mass :H=1 u, 0=16u) (b) Write the formulae of the following compounds : (i) Ammonium sulphate (ii) Magnesium chloride

CBSE Class 9 CBSE Class 9 Science
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(a)

The ratio of hydrogen and oxygen in water -2.PNG912×191 61.3 KB

Ratio of number of atoms for water is H : O = 2 :1

(b) Ammonium sulphate - (NH4)2SO4
Magnesium chloride - MgCl2