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Question

If 1 mL of water contains 20 drops. Then no. of molecules in a drop of water is 
(Given NA=6.022×1023)
  1. 6.023×1023 molecules
  2. 1.667×1021 molecules
  3. 4.346×1020 molecules
  4. 1.376×1026 molecules


Solution

The correct option is B 1.667×1021 molecules
1 mL of water = 1 g of water
18 g of water contains 6.023×1023 molecules
1 mL of water contains =6.022×102318 molecules = 20 drops
1 drop of water will contain =6.022×102318×20
=1.667×1021 molecules

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