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Q.

Maximum number of water molecules are present in 

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a

1.8 ml of water

b

104moles of water

c

2.24×104 litres of water vapour at STP

d

1.8×102g of water

answer is A.

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Detailed Solution

(1)   Density of water 1g/cc
         18 ml of H2O  = 18g of  H2O = NA  molecules
         1.8 ml of  H2O = 1.8g of  H2O = NA10 molecules
(2) 1 mole  =  NA molecules
      104moles -  ?
       NA104molecules
(3) 22.4 lit of H2O (g) at STP -  NA molecule
     2.24x104lit of H2O (g) at STP - ?
         NA105
(4) 18g =  NA molecules
1.8×102g=?
    NA103
 

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