MCQ

Mole Concept

By Sakshi Goel | 18 May'20 | 976 Views

MCQ

Problem:
Weight of 1 x 10²² molecules of CuSO₄.5H₂O is
(a) 41.4 g
(b) 4.14 g
(c) 414.9 g
(d) 24.6 g

Solution:

molar mass of CuSO₄.5H₂O = 249.5 g/mol
1 mole = 6.023 x 10²³ molecules
Mass of 6.023 x 10²³ molecules = 249.5 g
mass of 1 x 10²² molecules = $249.5 Ã— \frac{1 Ã— 10^{22}}{6.023 Ã— 10^{23}} = 4.14 g$
Correct option is (b).

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