Question

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

Answer 1

Answer:

6.022×10^20

Explanation:

1 mol water=18 gram

so 18 gram=1 mol

0.018 gram=1/1000 mol

1 mol=6.022×10^23

hence ,1/1000 mol=6.022×10^20

Answer 2

Answer: (c) 6.022 X 10²⁰

Explanation: Molar mass of Water is 18g, one mole is 6.022 X 10²³ thus  multiply Avogadro number by 10⁻³, because 0.018g is 18 X 10⁻³.