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

The number of water molecules present in a drop of water (volume = 0.0018 ml) at room temperature is (density of H₂O = 1 g/mL)

A.6.023 × 1019✓ Correct

B.1.084 × 1018

C.4.84 × 1017

D.6.023 × 1023

Explanation

Volume of a drop of water given is 0.0018ml From density, M d V 1 0.0018 M d V x x 0.0018g 3 1.8 10 x g Moles of water 3 3 4 1.8 10 0.1 10 10 18 x x Number of 2 H O molecules 4 23 19 10 6.023 10 6.023 10 x x x The correct option is (a)

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