Click the Delta H is an Extension Property button within the activity, and analy

Question

Click the Delta H is an Extension Property button within the activity, and analyze the relationship between the two reactions that are displayed. The reaction that was on the screen when you started and its derivative demonstrate that the change in enthalpy for a reaction, Delta H, is an extensive property. Using this property, calculate the change in enthalpy for Reaction 2. Reaction 1: C_3H8(g) + 5O2(g) rightarrow 3CO_2(g) + 4H_2O(g), Delta H1 = -2043 kJ Reaction 2: 3C_3H8(g) + 15O2(g) rightarrow 9CO_2(g) + 12H_2O(g), Delta H2 =? Express your answer to four significant figures and include the appropriate units. Click on the Delta H changes sign when a process is reversed button within the activity and analyze the relationship between the two reactions that are displayed. The reaction that was on the screen when you started and its derivative demonstrate that the reaction enthalpy, Delta H, changes sign when a process is reversed. Consider the reaction B(s) + 3/2 O2(g) rightarrow B_2O3(s), Delta H = -1270kJ What will AH be for the reaction if it is reversed? Express your answer with appropriate units.

Explanation / Answer

part A

DH2 = 3*DH1

     = 3*(-2043)

     = -6129 KJ

Part B

DH of reaction = -1270 kj

DH of reverse reaction = +1270 kj

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