Question

Calculate the number of Molecules in 1 ml of water:

• A. $3.3\times {10}^{22}$
• B. $1$
• C. $6.02\times {10}^{23}$
• D. $18$

Answer 1

Answer: (A)

$3.3\times {10}^{22}$

Molecular weight of $H_{2}O$ = 18

18 g water = 18 ml water

(Because density of water = 1 )

$\because$ 18 ml of $H_{2}O$ contain

$=6.02\times {10}^{23}$ molecules of $H_{2}O$

$\therefore$ 1ml of $H_{2}O$ contain

$=\frac{6.02\times {10}^{23}}{18}$

$=3.3\times {10}^{22}$