1. Heating curves and  H temperature added energy

2. Heating curves and  H temperature added energy solidliquidgas

3. Heating curves and  H temperature added energy melting/ freezing pt solidliquidgas

4. Heating curves and  H temperature added energy melting/ freezing pt boiling/ cond. pt solidliquidgas

5. Heating curves and  H temperature added energy melting/ freezing pt boiling/ cond. pt solidliquidgas melting/freezing occurring here boiling/condensing occurring here

6. How is the total enthalpy change (  H) calculated for a substance whose temperature change includes a change in state?

7. temperature added energy  t of solid absorbing energy

8. temperature added energy  = m x C solid x  t

9. temperature added energy  = m x C solid x  t the energy absorbed as a solid melts becomes potential energy, so no  t

10. temperature added energy  H =  H fus x # mols  = m x C solid x  t

11. temperature added energy  H =  H fus x # mols  t of liquid absorbing energy  = m x C solid x  t

12. temperature added energy  H =  H fus x # mols  = m x C liquid x  t  = m x C solid x  t

13. temperature added energy  H =  H fus x # mols the energy absorbed as a liquid boils becomes potential energy, so no  t  = m x C liquid x  t  = m x C solid x  t

14. temperature added energy  H =  H fus x # mols  H =  H vap x # mols  = m x C liquid x  t  = m x C solid x  t

15. temperature added energy  H =  H fus x # mols  H =  H vap x # mols  t of gas absorbing energy  = m x C liquid x  t  = m x C solid x  t

16. temperature added energy  H =  H fus x # mols  H =  H vap x # mols  = m x C gas x  t  = m x C liquid x  t  = m x C solid x  t

17. temperature added energy  H =  H fus x # mols  H =  H vap x # mols  = m x C gas x  t  = m x C liquid x  t  = m x C solid x  t

18. temperature added energy  H =  H fus x # mols  H =  H vap x # mols  = m x C gas x  t  = m x C liquid x  t  = m x C solid x  t The  H of any substance being heated will be the sum of the  H of any  t occurring plus  H of any phase change occurring

19. temperature added energy  =  H fus x # mols  =  H vap x # mols  = m x C gas x  t  = m x C liquid x  t  = m x C solid x  t The  H of any substance being heated will be the sum of the  H of any  t occurring plus  H of any phase change occurring

20. temperature added energy  H =  H fus x # mols  H =  H vap x # mols  = m x C gas x  t  = m x C liquid x  t  = m x C solid x  t EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C?

21. temperature added energy -20 o C 0 o C 50 o C EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C?

22. temperature added energy EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? -20 o C 0 o C 50 o C use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C

23. temperature added energy -20 o C 0 o C 50 o C  H  =  H fus x # mols   = m x C liquid x  t   = m x C solid x  t EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C

24. temperature added energy -20 o C 0 o C 50 o C  H  =  H fus x # mols   = 10g x 2.1 J/g o C x 20 o C EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C   = m x C liquid x  t

25. temperature added energy -20 o C 0 o C 50 o C  H  =10 g x 1mol/18g x 6.01kJ/mol   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C   = m x C liquid x  t

26. temperature added energy -20 o C 0 o C 50 o C   = 10g x 4.186 J/g o C x 50 o C   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C

27. temperature added energy -20 o C 0 o C 50 o C   = 10g x 4.186 J/g o C x 50 o C   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C total  H =   +  H 2 +  

28. temperature added energy -20 o C 0 o C 50 o C   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C total  H =   +  H 2 +   = 420 J + 3340 J + 2093 J   = 10g x 4.186 J/g o C x 50 o C

29. temperature added energy -20 o C 0 o C 50 o C   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? use the following values: C ice = 2.1 J/g o c,  H fus H 2 O = 6.01 kJ/mol, C H 2 O liq = 4.186 J/g o C total  H =   +  H 2 +   5853 J = 420 J + 3340 J + 2093 J   = 10g x 4.186 J/g o C x 50 o C

30. temperature added energy -20 o C 0 o C 50 o C   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? It takes 5853 joules to heat up 10 grams of water from -20 o C to +50 o C.   = 10g x 4.186 J/g o C x 50 o C

31. temperature added energy -20 o C 0 o C 50 o C   = 10g x 2.1 J/g o C x 20 o C  H 2 =10 g x 1mol/18g x 6.01 kJ/mol EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? It takes 5853 joules to heat up 10 grams of water from -20 o C to +50 o C.   = 10g x 4.186 J/g o C x 50 o C

32. temperature added energy -20 o C 0 o C 50 o C EXAMPLE : What is  H for 10 g water with a total  t from -20 o C to +50 o C? It takes 5853 joules to heat up 10 grams of water from -20 o C to +50 o C. 5853 J