21. The oxidation number of phosphorus in ATP (adenosine triphosphate) is : 22. The total number of stereoisomers in open-chain aldohexose (such as glucose) is : 23. 24. 25. AH of CO2(g), CO(g), N2O(g) and NO2(g) in kJ mol respectively is -393, -110, 81 and 34. Calculate the in kJ for the 2NO2(g) +3CO(g)->N2O(g) +3CO2(g). The maximum number of electrons with n = 3 and l=3 is: following reaction A 500g tooth-paste sample has 0.2g fluoride concentration. What is the concentration of fluoride in terms of ppm level?