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Question

The number of water molecules present in 2 litres of water is:

A
55.55 NA
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B
111.1 NA
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C
5.555 NA
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D
11.11 NA
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Solution

The correct option is B 111.1 NA
We know,
d=MV (d=density,M=mass,V=volume)
Since d = 1 g/mL (for water),
Mass in gram = Volume in mL
18 g = 18 mL
Number of H2O molecules in 18 mL =Number of H2O molecules in 18 g
Molar mass of H2O = 18 g
Number of H2O molecules in 2000 mL=NA18×2000=111.1 NA

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