How many atoms of carbon are present in a molecule of glucose

Explanation:

When glucose is converted to ethanol by yeast, one mole of glucose is converted  into two moles of ethanol and two moles of carbon dioxide,  

and this process produce two moles of ATP.  

C6H12O6 → 2 C2H5OH + 2 CO2

When glucose is converted to ethanol by yeast (as in the production of beer) 92% of the chemical energy that was originally stored in glucose still remains in the end product, ethanol, that is produced.