82Enthalpy-Cal-Ans

82Enthalpy-Cal-Ans - o rx =(– 1089.6 kJ/mole –(–...

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ENTHALPY CALCULATIONS FROM DATA TABLE GCHEM I LAB CONCEPT PROBLEMS ENTHALPY REACTION H o Rx = H o f ( PRODUCTS ) - H o f ( REACTANTS ) Determine the Enthalpy Change ( H) for the following chemical reactions . Obtain standard ( H o f ) from Appendix L “Selected Thermodynamic Values”, Kotz and Treichel, p A.31. 1) 4NH 3 (g) + 5O 2 (g) 4NO(g) + 6H 2 O(g ) ▲H o f (– 45.9 kJ/mole) (0.0 kJ/mole) (90.3kJ/mole) ( – 241.8kJ/mole) ∑▲H o f Products = (4 moles x 90.3kJ/mole) + (6 moles x – 241.8kJ/moles) = – 1089.6 kJ/mole ∑▲H o f Reactants = (4 moles x – 45.9kJ/mole) + (5 moles x 0.0kJ/mole) = – 183.6 kJ/mole ▲H
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Unformatted text preview: o rx = (– 1089.6 kJ/mole) – (– 183.6 kJ/mole) = – 906 kJ/mole 2) 2H 2 S (g) + 3O 2 (g) 2SO 2 (g) + 2H 2 O (g) – 1,036 kJ/mole 4 s/f 3) ____ CH 4 (g) + ____ Cl 2 (g) ____ CCl 4 (g) + ____ HCl (g) – 434 kJ/mole 3 s/f 4) C 2 H 4 (g) + 3 O 2 (g) 2 CO 2 (g) + 2 H 2 0 (l) – 1,411 kJ/mole 4 s/f 5) 2 C 6 H 6 (l) + 15 O 2 (g) 12 CO 2 (g) + 6 H 2 O (l) – 654 kJ/mole 3 s/f 6) 4NH 3 (g) + 5 O 2 (g) 4NO (g) + 6 H 2 O (g) – 906 kJ/mole 3 s/f 7) Ca(OH) 2 (s) + CO 2 (g) CaCO 3 (s) + H 2 O (g) – 69.13 kJ/mole 4 s/f jpechunf11/2009...
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This note was uploaded on 07/28/2011 for the course CHM 2045 taught by Professor Eng during the Spring '10 term at UNF.

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82Enthalpy-Cal-Ans - o rx =(– 1089.6 kJ/mole –(–...

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