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Question

Calculate the no. of molecules in drop of water weighing 0.036 g.

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Solution

Given mass = 0.036 g
Molar mass = 18 gm/mol

Number of moles= Given massMolar mass

Moles of H2O=0.03618=2×103
No. of molecules = 2×103×6.022×1023
=12.044×1020 molecules

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