To determine the number of required O2 (oxygen) moles for the complete combustion of one mole of propane, we need to understand the stoichiometry of the combustion reaction. The balanced equation for the combustion of propane is:

C3H8 + 5O2 -> 3CO2 + 4H2O

From the balanced equation, we can see that one mole of propane reacts with 5 moles of oxygen (O2) to produce 3 moles of carbon dioxide (CO2) and 4 moles of water (H2O).

Therefore, the correct answer is option 'B' which states that 5 moles of O2 are required for the complete combustion of one mole of propane.

Explanation:
1. Balanced equation: The balanced equation for the complete combustion of propane shows the stoichiometric ratio between propane and oxygen.
- C3H8 + 5O2 -> 3CO2 + 4H2O

2. Reactant and product ratio: From the balanced equation, we can determine the ratio of reactants (propane and oxygen) and products (carbon dioxide and water).
- 1 mole of propane reacts with 5 moles of oxygen to produce 3 moles of carbon dioxide and 4 moles of water.

3. Stoichiometry calculation: Since the question asks for the number of required O2 moles for the complete combustion of one mole of propane, we focus on the ratio between propane and oxygen.
- From the balanced equation, we can see that 1 mole of propane requires 5 moles of oxygen.

4. Answer determination: Based on the stoichiometry calculation, we can conclude that the correct answer is option 'B', which states that 5 moles of O2 are required for the complete combustion of one mole of propane.

CH3CH2CH3+5O2 GIVES 3CO2+4H2O A Balanced equation