13. 0/4 points| Previous Answers My Notes Ask Your Teacher Calculate AHon for ea

Question

13. 0/4 points| Previous Answers My Notes Ask Your Teacher Calculate AHon for each of the following using data from Appendix B. (a) C2H6(g) + O2(g) CO2(g) + H2O(g) [unbalanced] Your response d You answer s incorrect answer by more than 10%. Double check your calculations Your response is within 10% of the correct value. This may be due to roundoff error, or you could have a mistake in your calculation. Carry out all intermediate results to at least four-digit accuracy to minimize roundoff error. k] Your work in question(s) 14 will also be submitted or saved. Submit Assignment

Explanation / Answer

balance

C2H6 + O2 = CO2 + H2O

balance C, H then O

C2H6 + O2 = CO2 + 3H2O

C2H6 + O2 = 2CO2 + 3H2O

C2H6 + 7/2O2 = 2CO2 + 3H2O

now..

HRxn = (2CO2 + 3H2O) - (C2H6 + 7/2O2)

HRxn = 2*-393.5 + 3*-241.8 - -84.0 + 7/2*0

HRxn = -1428.4 kJ/mol of C2H6

b)

balance

SiO2 + 4HF = SiF4 + H2O

SiO2 + 4HF = SiF4 + 2H2O

HRxn = Hproducts- Hreactants

HRxn = (SiF4 + 2H2O) - (SiO2 + 4HF)

HRxn = -1614.9 + 2*-285.8 - (-910.7 + 4*-273.3)

HRxn = -182.6 kJ/mol of SiO2

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