UncategorizedThe number of water molecules in a drop of water weighing 5mg is

The number of water molecules in a drop of water weighing 5mg is

A
6.023 × 10²²
B
3.0125 × 10²¹
C
1.67 × 10²⁰
D
1.67 × 10²¹

Solution:

Weight of drop of water = 5mg = 5 $\times$ 10^-3 g

18g of H₂O contain -----------------------6.023 $\times$ 10²³ molecules

5 $\times$ 10^-3g of H₂O contain 'X' molecules

X = $\frac{5 \times 10^{- 3} \times 6.023 \times 10^{23}}{18}$

X = 1.67 $\times$ 10²⁰

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