Question

Which of the following has maximum number of molecules? *
(a) 7 g N₂
(b) 2 g H₂
(c) 8 g O₂
(d) 20 g NO₂​

Answer 1

Answer:

Explanation:

a) Molecular Mass of N₂= 14⨉2 = 28g

No of molecules in 7g of N₂

= 7/28

= 1/4

= 0.25 molecules

b) Molecular Mass of H₂= 1⨉2 = 2g

No of molecules in 2g of H₂

= 2/2

= 1 molecule

c) Molecular mass of O₂= 16⨉2= 32g

No of molecules in 8g of O₂= 8/32

=1/4

= 0.25 molecules

d) Molecular mass of NO₂= Atomic mass of N + 2 ⨉ Atomic mass of O

= 14 + 2 ⨉ 16

= 14 + 32

= 46

No of molecules in 20g of NO₂=

= 20/46

= 10/23

= 0.43 molecules

So, Option B is the correct answer