Question

How many molecules of SO₃ can be formed from 0.35 moles of O₂ (assuming excess SO₂) from the following UNBALANCED equation?

Answer 1

Molecules of SO₃  : 4.214 x 10²³

Further explanation

The reaction equation is the chemical formula of reagents and product substances  

A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products  

Reaction(balanced)

2SO₂(g) + O₂(g) → 2SO₃(g)

mol SO₃ :

$\tt mol~SO_3=\dfrac{2}{1}\times mol~O_2$

$\tt 2\times 0.35=0.7$

number of molecules :

1 mol = 6.02 x 10²³ particles(atoms, molecules,ions)

$\tt 0.7\times 6.02\times 10^{23}=4.214\times 10^{23}$