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MCQ

Percentage Composition
By Sakshi Goel | 19 May'20 | 983 Views

MCQ

Problem:

What is the mass percent of oxygen in Al2(SO4)3.18H2O. (M = 666.43 g/mol)
(a) 9.6
(b) 28.8
(c) 43.2
(d) 72


Solution:

Molar mass Al2(SO4)3.18H2O = 666.43 g/mol
Total number of oxygen atoms in the formula = 30
Total mass of oxygen atoms = 16 x 30 = 480 g/mol
mass percent of oxygen = fraction numerator 480 over denominator 666.43 end fraction cross times 100 space equals space 72 space percent sign
Correct option is (d).


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