Question

Number of moles in 128 gm of SO₂ will be
1. 1 mole
2. 2 mole
3. 3 mole
4. 4 mole

Answer 1

Correct Answer - Option 2 : 2 mole

Calculation:

The molar mass of SO₂ 

The molecular mass of Sulphur + 2 (molecular mass of oxygen) 

32 gm  + 2 (16 gm) = 64 gm

Number of moles in 64 gm = 1 mole

Number of moles in 128 gm = \(\frac{1}{64} × 128 = 2\)

 

1 mole of a substance is the atomic mass of it expressed in grams. 

In 1 mole 6.022 × 10 ²³ Particles are present