What is volume in lit of oxygen is required at STP is completely convert 1.5 moles of sulphur to sulphur dioxide?

Question

This is from chapter of behaviour of gases 

Options are

• 11.2
• 22.4
• 33.6
• 44.8

Answer 1

Given: STP, reaction from Sulfur to Sulfur Dioxide

Find: Volume of Oxygen needed

 

Method:

First, we need to determine the chemical reaction. Balance it. Then use stoichiometry to find the answer.

 

1. Determine the reaction. Keep in mind O2 is bi-molecular.

 

S(s) + O₂(g) → SO₂(g)

 

2. Balance the reaction. No balancing needed.

 

S(s) + O₂(g) → SO₂(g)

 

3. Use stoichiometry & dimensional analysis. Note: There are 22.4 mol gas/liter at STP.

 

Vol O₂ needed = 1.5 mol S x (1 mol O₂ / 1 mol S) x (22.4 L O₂ / 1 mol O₂)

 

4. Answer

 

Vol O₂ needed = 33.6 L O₂

 

 

S(s) + O₂(g) → SO₂(g)