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2. (Hess's Law) Thermochemical tables tell us that the conversion of one mole of diamond to one mole of graphite is accompanied by the release of 1.9 kJ of energy.
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1. Use Hess's law and the thermochemical equations given below to calculate the standard enthalpy change for the reaction between C2H4 and F2.
C2H4(g) + 6 F2(g) 2 CF4(g) + 4 HF(g) H° = ?
H2(g) + F2(g) 2 HF(g) H° = -537 kJ
C(s) + 2 F2(g) CF4(g) H° = -680 kJ
2 C(s) + 2 H2(g) C2H4(g) H° = +52.3 kJ
What we need to do is to add these three equations together in such a way as to generate the reaction between C2H4 and F2. It's not as hard as you think.
Rule 1: We can turn equations around, so long as we change the sign of the enthalpy term.
Rule 2: We can multiple ...
Solution attaches a Word document to show the calculations to find enthalpy changes and reaction conversions in proper formatting.