Question

6.
The number of water molecules in a drop of water weighing 0.018 g is
(b) 6.022 x 1023
(a) 6.022 x 1026
(d) 9.9 X 1022
(c) 6.022 x 1020​

Answer 1

Answer:

Number of moles=0.018/18=0.001 moles of water. 1mole of water[ 18g ] contains 6.022 x 10²³ molecules

Answer 2

first of all we have to calculate its moles..

n = given mass / molar mass

= 0.018/18 = 10^-3

.. now

no. of water molecules will be = 10^-3 x 6.022x 10^23 = 6.022×10^20. molecules...

so option C is correct.