Question

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: 4C3H8(g)+20O2(g)→12CO2(g)+16H2O(g), ΔH2=?

N2(g)+O2(g)→2NO(g)ΔH=180.5 kJ
12N2(g) +12O2(g) →NO(g)ΔH=90.25kJ
Scaling the molar quantities by ½ reduces the reaction enthalpy by ½ .

Answer 1