Calculate H and S for the combustion
how would you calculate delta H and delta S for a combustion reaction of 1 mole of ethane (C2H6) at 25C
Answer by: dannimay
First Answer Best Answer
-84.0 kj/mol 0 -393.5 kj/mol -285.8 kj/mol
Following the same steps but using the standard entropy values of the substance the solution for delta S = -309.8 j/mol
1 C2H6 (g) + 7/2 O2(g) → 2 CO2 (g) + 3 H20 (l)
Since the combustion reaction is at 25 ° C (298.15 K ), we can use the standard molar enthalpy formations (delta Hf ) to find the delta H of combustioin.
* It is very important to include the physical phase(solid, liquid, gas, etc.) for each
substance in your balanced equation.
Step 2: Using your Appendix ( most likely in the back of the book)under the Data Table for Thermodynamic Properties of Substances at 25°C (298.15 K) find the delta Hf values for each substance in the reaction.