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How many water molecules are there in one drop pf water (volume `0.0018ml)` at room temperature?A. `6.023 xx 10^(19)`B. `1.084 xx 10^(18)`C. `6.023 xx 10^(23)`D. `4.84 xx 10^(17)`

Answer» Correct Answer - A
No. of molecules `=(W)/(MW) xx N`
Correct Answer Is Option A)6.022×10¹⁹
Given volume in a drop of water=0.0018mL
Density of Water is 1g/mL
Therefore, In a drop of water there is 0.0018g of water.
no. of moles of water in drop=0.0018/18=0.0001
no. of molecules=no. of moles × Avogadro's No. 
no. of molecules= 6.022×10¹⁹
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