Question

Calculate the enthalpy of formation of butane, C4H10, using the balanced chemical

Answer 1

Answer:

-125.4

Explanation:

Target equation is 4C(s) + 5H2(g) = C4H10

These are the data equations for enthalpy of combustion

1. C(s) + O2(g) =O2(g) -393.5 kJ/mol * 4
2. H2(g) + ½O2(g) =H20(l) = 285.8 kJ/mol * 5
3. 2CO2(g) + 3H2O(l) = 13/2O2 (g) + C4H10 - 2877.1 reverse

To get target equation multiply data equation 1 by 4; multiply equation 2 by 5; and reverse equation 3, so...

Calculate 4(-393.5) + 5(-285.8) + 2877.6 and you should get the answer.