Thermodynamics and Thermochemistry 2 Question 18
18. From the following data, calculate the enthalpy change for the combustion of cyclopropane at . The enthalpy of formation of $\mathrm{CO}{2}(g), \mathrm{H}{2} \mathrm{O}(l) (g) 20.42 \mathrm{~kJ} \mathrm{~mol}^{-1} -33.0 \mathrm{~kJ} \mathrm{~mol}^{-1}$.
(1998, 5M)
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Solution:
- Given : Cyclopropane
Propene $\left(\mathrm{C}{3} \mathrm{H}{6}\right) ; \Delta H=-33 \mathrm{~kJ} \left(\mathrm{C}{3} \mathrm{H}{6}\right)+\frac{9}{2} \mathrm{O}{2} \longrightarrow 3 \mathrm{CO}{2}(g)+3 \mathrm{H}_{2} \mathrm{O}(l)$;
Adding :
Cyclopropane $+\frac{9}{2} \mathrm{O}{2}(g) \longrightarrow 3 \mathrm{CO}{2}(g)+3 \mathrm{H}_{2}(g) ;$