MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryMole _ Equivalent ConceptAtomic and Molecular Masses

The weight of 1 × 1022 molecules of CuSO₄. 5H₂O is

A.41.59 g

B.415.9g

C.4.159 g✓ Correct

D.none of the three

Explanation

4 2 .5 CuSO H O has molecular mass= 249.5 g/mol. 23 6.023 10 x molecule has molecular mass = 249.5 g/mol. Therefore, 22 1 10 x molecule has molecular mass= 22 23 249.5 10 / 6.023 10 x x = 4.1 g.

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