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Video Tutorial on Energetics, Hess’s Law, Enthalpy of Formation and Combustion in Energetics. Prepared by Lawrence Kok http://lawrencekok.blogspot.com.

Published byGodfrey Price Modified over 8 years ago

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Presentation on theme: "Video Tutorial on Energetics, Hess’s Law, Enthalpy of Formation and Combustion in Energetics. Prepared by Lawrence Kok http://lawrencekok.blogspot.com."— Presentation transcript:

1 Video Tutorial on Energetics, Hess’s Law, Enthalpy of Formation and Combustion in Energetics.
Prepared by Lawrence Kok

2 Video on Energetics and Enthalpy Calculation
Enthalpy of reaction using combustion data Enthalpy of reaction using combustion data Enthalpy of reaction using formation data Enthalpy of reaction using formation data

3 Basic Rules for ΔH Enthalpy changes calculations
1 Total amt energy released/absorbed is α to number of moles of reactants 2 ΔH for reverse reaction is EQUAL in magnitude but opposite in sign to ΔH forward Standard condition for measuring STANDARD ENTHALPY CHANGE, ΔH 3 4 Unit for ΔH is KJ mol -1

4 Basic Rules for ΔH Enthalpy changes calculations
Temp and Heat 5 Enthalpy change ΔH measured using a calorimeter 6 Specific heat capacity for a substance – water ( 4.18J g-1K-1) 7

5 Standard Enthalpy Change of Formation for a reaction, ΔHθ f

6 Standard Enthalpy Change of reaction, ΔHθ f
ΔHθ f = Amt of energy absorbed or released when ONE mole of compound formed from Its standard state from its constituents in their standard states Ex : NaCI (s) + 1/2CI2 (g) → NaCI (s) Notes on ΔHθ f

7 Standard Enthalpy Change of reaction, ΔHθ f
ΔHθ f = Amt of energy absorbed or released when ONE mole of compound formed from Its standard state from its constituents in their standard states Ex : NaCI (s) + 1/2CI2 (g) → NaCI (s)

8 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 1 Calculate the ΔHθ ,enthalpy change for the reaction below 4 CH3NHNH N2O4 → 4CO H2O N2 Steps 1

9 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 1 Calculate the ΔHθ ,enthalpy change for the reaction below 4 CH3NHNH N2O4 → 4CO H2O N2 Steps 1 2 Formation of reactants data Formation of products data

10 Ans Calculate the ΔHθ ,enthalpy change for the reaction below 4 CH3NHNH N2O4 → 4CO H2O N2

11 Calculate the ΔHθ ,enthalpy change for the reaction below
Ans Calculate the ΔHθ ,enthalpy change for the reaction below 4 CH3NHNH N2O4 → 4CO H2O N2 Ans Formation data

12 Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below NH4NO3 → N2O H2O using energy cycle diagram

13 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below NH4NO3 → N2O H2O using energy cycle diagram Ans Formation data

14 Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below NH4NO3 → N2O H2O using energy level diagram

15 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below NH4NO3 → N2O H2O using energy level diagram Ans Formation data

16 Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below C2H /2O2 → 2CO H2O using energy cycle diagram

17 Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below C2H /2O2 → 2CO H2O using energy cycle diagram Ans

18 Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below C2H /2O2 → 2CO H2O using energy level diagram

19 Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below C2H /2O2 → 2CO H2O using energy level diagram Ans

20 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below C2H H → C2H6

21 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below C2H H → C2H6 Energy Cycle diagram Ans

22 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below C2H H → C2H6 Energy Cycle diagram or Energy Level Diagram Ans Answer the same = -137kJmol-1

23 Ex 5 Write balanced equation and calculate the ΔHθ for the following reactions Zinc + Chlorine forming zinc chloride b) Hydrogen sulfide + sulfur dioxide forming sulfur and water c) Lead (II) nitrate decomposing to lead (II) oxide, nitrogen dioxide and oxygen

24 Ex 4 Write balanced equation and calculate the ΔHθ for the following reactions Zinc + Chlorine forming zinc chloride b) Hydrogen sulfide + sulfur dioxide forming sulfur and water c) Lead (II) nitrate decomposing to lead (II) oxide, nitrogen dioxide and oxygen

25 Standard Enthalpy Change of combustion, ΔHθ c

26 Standard Enthalpy Change of combustion, ΔHθ c
ΔHθ c = Amt of energy released when ONE mole of substance completely burnt in OXYGEN under standard conditions Notes on combustion

27 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 1 Calculate the ΔHθ ,enthalpy change for the reaction below 2 C H → C2H6 Using Energy Cycle Diagram

28 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 1 Calculate the ΔHθ ,enthalpy change for the reaction below 2 C H → C2H6 Using Energy Cycle Diagram Ans

29 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below 1st method Using Energy Cycle Diagram 2 C H → C2H4

30 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below 1st method Using Energy Cycle Diagram 2 C H → C2H4 Ans

31 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below 2nd method Using Energy Level Diagram 2 C H → C2H4

32 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 2 Calculate the ΔHθ ,enthalpy change for the reaction below 2nd method Using Energy Level Diagram 2 C H → C2H4 Ans

33 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below 1st method Using Energy Cycle Diagram 2 C H /2O → C2H5OH

34 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below 1st method Using Energy Cycle Diagram 2 C H /2O → C2H5OH Ans

35 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below 2nd method Using Energy Level Diagram 2 C H /2O → C2H5OH

36 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 3 Calculate the ΔHθ ,enthalpy change for the reaction below 2nd method Using Energy Level Diagram 2 C H /2O → C2H5OH Ans

37 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below TWO methods 1st method, using combustion data 2 C H /2O2→ C2H5OH Combustion data

38 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below TWO methods 1st method, using combustion data 2 C H /2O2→ C2H5OH Ans Combustion data

39 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below 2nd method, using formation data 2 C H /2O2→ C2H5OH Formation data

40 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 4 Calculate the ΔHθ ,enthalpy change for the reaction below 2nd method, using formation data 2 C H /2O2→ C2H5OH Formation data Ans

41 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 5 Calculate the ΔHθ ,enthalpy change for the reaction below Using combustion data 3C2H → C6H6 Combustion data

42 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 5 Calculate the ΔHθ ,enthalpy change for the reaction below Using combustion data 3C2H → C6H6 Ans Combustion data

43 Calculate ΔHθ c ,enthalpy change for combustion of propene shown below
Ex 6 Calculate ΔHθ c ,enthalpy change for combustion of propene shown below Using combustion /formation data 3CH2 =CHCH3 + 9/2O2 → 3CO H2O6

44 Calculate ΔHθ c ,enthalpy change for combustion of propene shown below
Ex 6 Calculate ΔHθ c ,enthalpy change for combustion of propene shown below Using combustion /formation data 3CH2 =CHCH3 + 9/2O2 → 3CO H2O6 Ans

45 Calculate the ΔHθ ,enthalpy change for the reaction below
Ex 7 Calculate the ΔHθ ,enthalpy change for the reaction below C2H H2 → C2H6 Using Energy Cycle Diagram Using Energy Level Diagram Answer the same = -137kJmol-1

46 Video on Energetics and Enthalpy Calculation
Using equation method to solve ΔH Using equation method to solve ΔH Using formation enthalpy to solve ΔH (Khan Academy) Concept on enthalpy, ΔH (Khan Academy)

47 Acknowledgements Thanks to source of pictures and video used in this presentation Thanks to Creative Commons for excellent contribution on licenses Prepared by Lawrence Kok Check out more video tutorials from my site and hope you enjoy this tutorial

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