Hess's Law: The Swiss chemist G.H. Hess found that when 2 or more chemical reactions are combined, the heat of reactions is simply the sum of the individual heat of reaction. Ex. N2(g) O2(g) arrow 2NO(g) ∆H1= 180kJ 2NO(g) O2(g) arrow 2NO2(g) ∆H2= -112kJ N2(g) 2O2(g) arrow 2NO2(g) ∆Hrxn = ∆H1 ∆H2 = 180kJ -112kJ = 68kJ Note: NO(g) does not appear in the combined reaction because it was present in equal amount on opposite sides of the individual reaction. Hess’s law is the application of the first
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Hess's Law: The Swiss chemist G.H. Hess found that when 2 or more c…
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