Question

Calculate the no. Of molecules in a drop of water weighing 0.05 gram.

Answer 1

Hi Friend
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1 Mole = 18 grams = 6.022 x 10^23 molecules
1 gram = 6.022 x 10^23/18 molecules


↪5/100 grams = 6.022   x 10 ^23 /18 X 5/100 molecules 
   = 6.022 x 10 ^21/18 X 5
    = 30.11 x 10 ^ 21 /1   
  =1.67 x 1^21 molecules.

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$hope \: it \: helps$