AP Chemistry 6.8 Enthalpy of Formation

[Maximum number: 2]

A student places a mixture of plastic beads consisting of polypropylene (PP) and polyvinyl chloride (PVC) in a 1.0 L beaker containing distilled water. After stirring the contents of the beaker vigorously, the student observes that the beads of one type of plastic sink to the bottom of the beaker and the beads of the other type of plastic float on the water. The chemical structures of PP and PVC are represented by the diagrams below, which show segments of each polymer.

Figure for Question AP Chemistry 6.8 A Calculate the Enthalpy Change for a Chemical or Physical Process Based on the Standard Enthalpies of Formation Questions question 1 — AP Chemistry

Using the table of standard enthalpies of formation below, determine whether the combustion of 2.00 mol of propene releases more, less, or the same amount of energy that 2.00 mol of vinyl chloride releases. Justify your answer with a calculation. The balanced equation for the combustion of 2.00 mol of propene is $2 \mathrm{C}_{3} \mathrm{H}_{6}(g)+9 \mathrm{O}_{2}(g) \rightarrow 6 \mathrm{CO}_{2}(g)+6 \mathrm{H}_{2} \mathrm{O}(g)$ .

Table for Question AP Chemistry 6.8 A Calculate the Enthalpy Change for a Chemical or Physical Process Based on the Standard Enthalpies of Formation Questions question 1 — AP Chemistry

$\Delta H^{\circ}=6(-394)+6(-242)-2(21)=-3858 \mathrm{~kJ} / \mathrm{mol}_{r x n}$
The combustion of 2.00 mol of propene releases more energy. 1 point is earned for the calculation of the enthalpy of combustion of propene. 1 point is earned for the comparison of propene to vinyl chloride that is consistent with the calculated value.
\\ (4 points)

Figure for Answer to Question AP Chemistry 6.8 A Calculate the Enthalpy Change for a Chemical or Physical Process Based on the Standard Enthalpies of Formation Questions question 1 — AP Chemistry

AP Chemistry 6.8 A Calculate the Enthalpy Change for a Chemical or Physical Process Based on the Standard Enthalpies of Formation Questions question 1