So, Option D) 1.2 × 10²³ is Correct Answer.

(D) 1.2 ×10^23

QUESTION

The number of oxygen atoms in 4.4 g of CO2 is

OPTIONS

(A) 6 × 10²³

(B) 11 × 10²³

(C) 12 × 10²³

(D) 1.2 × 10²³

FORMULA USED

WE KNOW

C stands for atomic symbol of Carbon

O stands for atomic symbol of oxygen

atomic mass of nitrogen (C) is 12

atomic mass of hydrogen (O) is 16

SOLUTION

step 1

calculate the molecular mass of CO2

CO2= C+O+O

= C +2O

molecular mass = atomic mass of carbon + 2 x atomic mass of oxygen

so molecular mass of CO2 is 44 u

step 2

calculate the number of molecules in given weight

step 3

calculate number of atoms

HOPE IT HELPS