Question

IF 1 ML OF WATER CONTAINS 20 DROPS THEN NUMBER OF MOLECULES IN A DROP OF WATER IS 1.376 X 10 26 6.022 X 10 23 1.67 X 10 21 4.346 X 10 20

Answer 1

Considering that 1 ml of water has a mass of 1 gram, calculate moles of 1 drop.

20 drops = 1ml
then 1 drop = 1x1/20
                    =0.05ml
therefore if 1ml = 1g
               then 0.05ml= 0.05g( mass of 1 drop of water)
molar mass of H2O= 18
Hence its moles= 0.05/18 =  2.7778x10^-3

Avagadros constant:  1 mole = 6.023x10^23 molecules

if 1 mole = 6.023x10^23molecules
then 2.7778x10^-3= 6.023x10^23 x 2.7778x10^-3 molecules
         
                            =1.6731 x 10^21 molecules (in a drop of water)
 
               

Answer 2

Explanation:

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