1.Video Tutorial on Energetics, Hesss Law,Enthalpy of Formation and Combustion inEnergetics. Prepared by Lawrence Kok http://lawrencekok.blogspot.com

2. Video on Energetics and Enthalpy CalculationEnthalpy of reaction using combustion dataEnthalpy of reaction using combustion dataEnthalpy of reaction using formation dataEnthalpy of reaction using formation data 3. Basic Rules for H Enthalpy changes calculations1 Total amt energy released/absorbed is to number of moles of reactants2 H for reverse reaction is EQUAL in magnitude but opposite in sign to H forward3 Standard condition for measuring STANDARD ENTHALPY CHANGE, H4 Unit for H is KJ mol -1 4. Basic Rules for H Enthalpy changes calculationsTemp and Heat56 Enthalpy change H measured using a calorimeter7Specific heat capacity for a substance water ( 4.18J g-1K-1) 5. Standard Enthalpy Change of Formation for a reaction, H f 6. Standard Enthalpy Change of reaction, H fH f = Amt of energy absorbed or released when ONE mole of compound formed fromIts standard state from its constituents in their standard statesEx : NaCI (s) + 1/2CI2 (g) NaCI (s)Notes on H f 7. Standard Enthalpy Change of reaction, H fH f = Amt of energy absorbed or released when ONE mole of compound formed fromIts standard state from its constituents in their standard statesEx : NaCI (s) + 1/2CI2 (g) NaCI (s) 8. Ex 1Calculate the H ,enthalpy change for the reaction below4 CH3NHNH2 + 5 N2O4 4CO2 + 12 H2O + 9N2Steps 1 9. Ex 1Calculate the H ,enthalpy change for the reaction below 4 CH3NHNH2 + 5 N2O4 4CO2 + 12 H2O + 9N2Steps12 Formation of reactants dataFormation of products data 10. Ans Calculate the H ,enthalpy change for the reaction below4 CH3NHNH2 + 5 N2O4 4CO2 + 12 H2O + 9N2 11. AnsCalculate the H ,enthalpy change for the reaction below 4 CH3NHNH2 + 5 N2O4 4CO2 + 12 H2O + 9N2 AnsFormation data 12. Ex 2 Calculate the H ,enthalpy change for the reaction below NH4NO3 N2O + 2 H2O using energy cycle diagram 13. Ex 2Calculate the H ,enthalpy change for the reaction below NH4NO3 N2O + 2 H2O using energy cycle diagramAnsFormation data 14. Ex 2 Calculate the H ,enthalpy change for the reaction below NH4NO3 N2O + 2 H2O using energy level diagram 15. Ex 2Calculate the H ,enthalpy change for the reaction below NH4NO3 N2O + 2 H2O using energy level diagramAnsFormation data 16. Ex 3 Calculate the H ,enthalpy change for the reaction below C2H6 + 7/2O2 2CO2 + 3 H2O using energy cycle diagram 17. Ex 3Calculate the H ,enthalpy change for the reaction belowC2H6 + 7/2O2 2CO2 + 3 H2O using energy cycle diagramAns 18. Ex 3 Calculate the H ,enthalpy change for the reaction below C2H6 + 7/2O2 2CO2 + 3 H2O using energy level diagram 19. Ex 3Calculate the H ,enthalpy change for the reaction belowC2H6 + 7/2O2 2CO2 + 3 H2O using energy level diagramAns 20. Ex 4 Calculate the H ,enthalpy change for the reaction below C2H4 + H2C2H6 21. Ex 4 Calculate the H ,enthalpy change for the reaction below C2H4 + H2C2H6AnsEnergy Cycle diagram 22. Ex 4 Calculate the H ,enthalpy change for the reaction below C2H4 + H2 C2H6AnsEnergy Cycle diagram or Energy Level Diagram Answer the same = -137kJmol-1 23. Ex 5 Write balanced equation and calculate the H for the following reactionsa) Zinc + Chlorine forming zinc chlorideb) Hydrogen sulfide + sulfur dioxide forming sulfur and waterc) Lead (II) nitrate decomposing to lead (II) oxide, nitrogen dioxide and oxygen 24. Ex 4 Write balanced equation and calculate the H for the following reactionsa) Zinc + Chlorine forming zinc chlorideb) Hydrogen sulfide + sulfur dioxide forming sulfur and waterc) Lead (II) nitrate decomposing to lead (II) oxide, nitrogen dioxide and oxygen 25. Standard Enthalpy Change of combustion, H c 26. Standard Enthalpy Change of combustion, H cH c= Amt of energy released when ONE mole of substance completely burnt inOXYGEN under standard conditionsNotes on combustion 27. Ex 1Calculate the H ,enthalpy change for the reaction belowUsing Energy Cycle Diagram 2 C + 3H2 C2H6 28. Ex 1Calculate the H ,enthalpy change for the reaction belowUsing Energy Cycle Diagram 2 C + 3H2 C2H6Ans 29. Ex 2Calculate the H ,enthalpy change for the reaction below1st methodUsing Energy Cycle Diagram 2 C + 2H2 C2H4 30. Ex 2Calculate the H ,enthalpy change for the reaction below1st methodUsing Energy Cycle Diagram 2 C + 2H2 C2H4Ans 31. Ex 2Calculate the H ,enthalpy change for the reaction below2nd methodUsing Energy Level Diagram 2 C + 2H2 C2H4 32. Ex 2Calculate the H ,enthalpy change for the reaction below2nd methodUsing Energy Level Diagram 2 C + 2H2 C2H4Ans 33. Ex 3Calculate the H ,enthalpy change for the reaction below1st methodUsing Energy Cycle Diagram 2 C + 3H2 + 1/2O2 C2H5OH 34. Ex 3Calculate the H ,enthalpy change for the reaction below1st methodUsing Energy Cycle Diagram 2 C + 3H2 + 1/2O2 C2H5OHAns 35. Ex 3Calculate the H ,enthalpy change for the reaction below2nd methodUsing Energy Level Diagram 2 C + 3H2 + 1/2O2 C2H5OH 36. Ex 3Calculate the H ,enthalpy change for the reaction below2nd methodUsing Energy Level Diagram 2 C + 3H2 + 1/2O2 C2H5OHAns 37. Ex 4 Calculate the H ,enthalpy change for the reaction belowTWO methods1st method, using combustion data2 C + 3H2 + 1/2O2 C2H5OHCombustion data 38. Ex 4 Calculate the H ,enthalpy change for the reaction belowTWO methods1st method, using combustion data2 C + 3H2 + 1/2O2 C2H5OHAnsCombustion data 39. Ex 4Calculate the H ,enthalpy change for the reaction below2nd method, using formation data 2 C + 3H2 + 1/2O2 C2H5OHFormation data 40. Ex 4Calculate the H ,enthalpy change for the reaction below2nd method, using formation data 2 C + 3H2 + 1/2O2 C2H5OHFormation dataAns 41. Ex 5Calculate the H ,enthalpy change for the reaction belowUsing combustion data3C2H2C6H6Combustion data 42. Ex 5Calculate the H ,enthalpy change for the reaction belowUsing combustion data3C2H2C6H6AnsCombustion data 43. Ex 6Calculate H c ,enthalpy change for combustion of propene shown belowUsing combustion /formation data 3CH2 =CHCH3 + 9/2O2 3CO2 + 3H2O6 44. Ex 6Calculate H c ,enthalpy change for combustion of propene shown belowUsing combustion /formation data 3CH2 =CHCH3 + 9/2O2 3CO2 + 3H2O6Ans 45. Ex 7 Calculate the H ,enthalpy change for the reaction belowC2H4 + H2 C2H6 Using Energy Cycle Diagram Using Energy Level DiagramAnswer the same = -137kJmol-1 46. Video on Energetics and Enthalpy Calculation Using equation method to solve HUsing equation method to solve HUsing formation enthalpy to solve H (Khan Academy) Concept on enthalpy, H (Khan Academy) 47. AcknowledgementsThanks to source of pictures and video used in this presentationThanks to Creative Commons for excellent contribution on licenseshttp://creativecommons.org/licenses/Prepared by Lawrence KokCheck out more video tutorials from my site and hope you enjoy this tutorialhttp://lawrencekok.blogspot.com