Question

1. Click the DeltaH is an Extensive 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, ΔH, is an extensive property. Using this property, calculate the change in enthalpy for Reaction 2. Reaction 1: C3H8(g)+5O2(g)→3CO2(g)+4H2O(g), ΔH1=−2043 kJ Reaction 2: 3C3H8(g)+15O2(g)→9CO2(g)+12H2O(g), ΔH2=?

2.

Click on the 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, ΔH, changes sign when a process is reversed.

Consider the reaction

N2(g)+3H2(g)→2NH3(g), ΔH =−92.3kJ

What will ΔH be for the reaction if it is reversed?

3.

Click on the button within the activity and use the example shown to calculate the reaction enthalpy, ΔH, for the following reaction:

CH4(g)+2O2(g)→CO2(g)+2H2O(l)

Use the series of reactions that follow:

C(s)+2H2(g)→CH4(g), ΔH =−74.8 kJ.

C(s)+O2(g)→CO2(g), ΔH =−393.5 kJ.

2H2(g)+O2(g)→2H2O(g), ΔH =−484.0 kJ.

H2O(l)→H2O(g), ΔH =44.0 kJ.

Answer 1