Wht isthe PO ratio for the oxidation of ubiquinone if three

Wht isthe P/O ratio for the oxidation of ubiquinone if three protons are required to synthesize one ATP?

The answer is 1.5. I will need an explanation. Thank you

Solution

The Phosphate/Oxygen Ratio, or P/O Ratio is the amount of ATP produced from the movement of two electrons through a defined electron transport chain, donated by reduction of an oxygen atom.

The P:O ratio is equal to the product of (H+/2 e-) and (~P/H+).which comes out to be P/2e-. No of protons is 3 ie P = 3 so P:O ratio is 3/2 ie 1.5