Homework Help: Chemistry

Posted by Hailee on Friday, March 16, 2012 at 5:10pm.

Use Hess's law to calculate the enthalpy change for the reaction:
3C(s) + 3H2(g) → C3H6(g)

Given the following thermochemical equations:

2C3H6(g) + 9O2(g) → 6CO2(g) + 6H2O(l) ΔH = -4116.0 kJ/mol

C(s) + O2(g) → CO2(g) ΔH = -393.51 kJ/mol

H2(g) + ½O2(g) → H2O(l) ΔH = -285.83 kJ/mol

please im soo confused!

Chemistry - DrBob222, Friday, March 16, 2012 at 5:35pm
I can't decipher the symbols, especially the coefficient for oxygen in the fourth equation (counting all equations you posted).

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