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CAS CH 131 (24)
Final

enthalpy and entropy examples

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Department
Chemistry
Course
CAS CH 131
Professor
Andrei Lapets
Semester
Fall

Description
CH CO + 2O   ▯2CO  +H O 2 2 2 2 ΔH = ­981 KJ CH  4 2O   ▯2O  + 2H2O 2 ΔH = ­802 KJ 2CH  +42O   ▯2H CO + 2H O 2 what is ΔH? 2CO  +2H O  2CH CO + 22 2 ΔH = 981 KJ 2CH  + 4O   ▯2CO  + 4H O 4 2 2 2 ΔH  ­1604 KJ 2CH  +42O   ▯C2 CO + 2H O 2 ΔH = ­623 KJ 100 g of ice at ­25 C is heated to form a gas that is 150 C is going through normal  melting and vaporization. How much thermal energy is required to achieve this process?  C sice = 2.1 J/g/K, C  waser = 4.18 J/g/K, C  water sapor = 2.0 J/g/K, ΔH melting = 333.3  J/g, ΔH vaporization = 2222.2 J/g. Δq  1 100 g (2.1)(0+25) = 5250 J Δq  = 100 g(333.3) = 33300 J 2 Δq  3 100 g(4.18)(100­0) = 41800 J Δq  4 100 g(2222.2) = 222220 J Δq  5 100 g(2.0)(150­100) = 10000 Δq = add all values o o o What is ΔH  ofF2NO + O   ▯2NO ?2ΔH  NO = 20 KJ/Fol, ΔH  NO  = 33.18 KJ/mol. F 2 o ΔH reactants2*90+0=180 KJ ΔH o  = 2(33.18) = 66.2 oproducts ΔH  = 66.2­180 = ­113.8 KJ o ΔH  f ­113.8/2 = ­66.9 KJ/mol o o What is the ΔH  
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