Question

35 drops of a liquid having density 1.2 g/mL, mass 2.4 g. Assuming molar mass of liquid 70. Select the correct statements A) Volume of one drop of liquid = 0.057 mL B Mass of one drop of liquid -0.068 g C) Number of molecules in one drop of liquid = 5.85 x 1020 D) Number of molecules in 35 drop of liquid 2.05 x 1022​

Answer 1

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Mass of 1 drop=35/2.4=0.068 g

Volume of 1 drop=Density of liquidMass of one drop=0.068/1.2=0.057 ml

Number of molecules in one drop of liquid=Moles of one drop× NA=0.068/70×6.023×1023=5.85×1020

Number of molecules in 35 drops of liquid=Moles of 35 drop× NA=2.4/70×6.023×1023=2.05×1022

Answer 2

Explanation:

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Mass of 1 drop=35/2.4=0.068 g

Volume of 1 drop=Density of liquidMass of one drop=0.068/1.2=0.057 ml

Number of molecules in one drop of liquid=Moles of one drop× NA=0.068/70×6.023×1023=5.85×1020

Number of molecules in 35 drops of liquid=Moles of 35 drop× NA=2.4/70×6.023×1023=2.05×1022