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Enthalpy change of reaction
· We cannot calculate Hrº via route 1
· So we go via the Hfº of it's elements
(route 2)…read more

Slide 3

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Example to try!
· Hfº in KJ.mol-1
· SO2(g) = -297
· H2S(g) = -20.2
· H2O(l) = -286
· Remember:
· Elements= 0…read more

Slide 4

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Answers
· Products minus reactants
· Reactants = -297 + (-20.2 * 2)
· Products = 0 + (-286 * 2)
· = -234.6 kJ.mol-1…read more

Slide 5

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Enthalpy change of combustion
· In a combustion reaction we cannot go by
Hfº (route 1)
· So must go by Hcº (route 2)…read more

Slide 6

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Example to try!
· Hcº in KJ.mol-1:
· C(s) = -394
· H2(g) = -286
· C2H5OH(l) = -1367…read more

Slide 7

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