# Which Contains More Molecules, 10 G of Sulphur Dioxide (So2) Or 10 G of Oxygen (O2) ? (Atomic Masses : S = 32 U ; O = 16 U) - Science

Short Note

Which contains more molecules, 10 g of sulphur dioxide (SO2) or 10 g of oxygen (O2) ?

(Atomic masses : S = 32 u ; O = 16 u)

#### Solution

Given:

Mass of sulphur dioxide = 10g

Molar mass of sulphur dioxide = (1 × 32) + (2 × 16) = 64g

We know that 64g of sulphur dioxide contain 6.022 × 1023 molecules.

Number of molecules in 64g  sulphur dioxide = 6.022 × 1023

Number of molecules in 10g  sulphur dioxide  = 10 × 6.022 × 1023/ 64

Hence, the number of molecules in 10g sulphur dioxide is 9.4× 1022.

Given:

Mass of oxygen = 10g

Molar mass of oxygen molecule = (2 × 16) = 32g

Number of molecules in 32g oxygen = 6.022 × 1023

Number of molecules in 10g oxygen = 10 × 6.022 × 1023/ 32

Hence, the number of molecules in 10g  oxygen is 18.8 × 1022

It is clear that the number of atoms in 10g  oxygen is greater than that in 10g  sulphur dioxide.

Concept: Molecules
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#### APPEARS IN

Lakhmir Singh Class 9 Chemistry - Science Part 2
Chapter 3 Atoms and Molecules
Hots Questions | Q 45 | Page 174