CBSE Class 9 Answered
(i)What do the following symbols formulae stand for :
(a)2O (b) O2 (c)O3 (d)H2O
(ii) Give the chemical formulae of the following compounds.
(a) Potassium Carbonate(b) Calcium chloride
(iii) Calculate the formula unit mass of Al2(SO4)3
(Given atomic mass of Al - 27u, S - 32u, O - 16u)
Asked by Topperlearning User | 09 May, 2014, 03:04: PM
Expert Answer
(i) (a)20 - Two atoms of oxygen
(b) O2 molecule - Diatomic oxygen
(c) O3 molecule - Triatomic oxygen
(d) H2O - Two atoms of hydrogen and 1 atom of oxygen forming one
molecule of water
(ii)K2CO3 - Potassium carbonate
CaCl2- Calcium Chloride
(iii) Al2(SO4)3
Al - 27 x 2= 54 u
S - 32 x 3 = 96 u
O - 16 x 12=192 u
Formula unit mass = 54 + 96 + 192 = 342 u
Answered by | 09 May, 2014, 05:04: PM
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