Question

The number of molecules in 16 g of O₂ gas is :

(a) 3.0X10²ᶟ (b) 6.022X10²ᶟ (c) 12.04 X10²ᶟ (d) 2.0 X10²ᶟ​

Answer 1

Answer:

O2 = 2*16

32u

Moles = 16/32 mol

0.5*6.022*10^23

=> ans a

Answer 2

Given:

The mass of the Oxygen gas = 16 gm

To find:

The number of molecules in 16 gm of O₂.

Solution:

Number of moles in 16 gm of O₂ can be found out as follows = 16/32 = 0.5 moles.

Now let's find out the number of molecules in 16 gm of O₂.

Number of molecules in 0.5 moles of O₂ will be= 0.5* 6.023*10²³ molecules ≈ 3.0* 10²³ molecules.

Therefore the number of molecules in 16 gm of O₂ is 3.0*10²³, thus option a is correct.