hess's law

# hess's law - Hess's Law Start Finish A State Function Path...

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1 Hess’s Law Start Finish A State Function: Path independent . Both lines accomplished the same result, they went from start to finish. Net result = same.

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2 Determine the heat of reaction for the reaction: 4NH 3 (g) + 5O 2 (g) 4NO(g) + 6H 2 O(g) Using the following sets of reactions: N 2 (g) + O 2 (g) 2NO(g) H = 180.6 kJ N 2 (g) + 3H 2 (g) 2NH 3 (g) H = - 91.8 kJ 2H 2 (g) + O 2 (g) 2H 2 O(g) H = -483.7 kJ Hint: The three reactions must be algebraically manipulated to sum up to the desired reaction. and. . the H values must be treated accordingly.
4NH 3 (g) + 5O 2 (g) 4NO(g) + 6H 2 O(g) Using the following sets of reactions: N 2 (g) + O 2 (g) 2NO(g) H = 180.6 kJ N 2 (g) + 3H 2 (g) 2NH 3 (g) H = - 91.8 kJ 2H 2 (g) + O 2 (g) 2H 2 O(g) H = -483.7 kJ Goal: NH : O : NO: H O: Reverse and x 2 4 NH 3 2 N 2 + 6 H 2 H = + 183.6 kJ Found in more than one place, SKIP IT (its hard). x2

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hess's law - Hess's Law Start Finish A State Function Path...

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