Calculate the heats of combustion for the following reactions. Use standard enth

Question

Calculate the heats of combustion for the following reactions. Use standard enthalpies of formation. (a) C2H4(g)+3O2(g)--> 2CO2(g)+2H2O(l) (kJ/mol) (b) 2H2S(g)+3O2(g)--> 2H2O(l) +2SO2(g) (kJ/mol) Calculate the heats of combustion for the following reactions. Use standard enthalpies of formation. (a) C2H4(g)+3O2(g)--> 2CO2(g)+2H2O(l) (kJ/mol) (b) 2H2S(g)+3O2(g)--> 2H2O(l) +2SO2(g) (kJ/mol) Calculate the heats of combustion for the following reactions. Use standard enthalpies of formation. (a) C2H4(g)+3O2(g)--> 2CO2(g)+2H2O(l) (kJ/mol) (b) 2H2S(g)+3O2(g)--> 2H2O(l) +2SO2(g) (kJ/mol)

Explanation / Answer

(a) C2H4(g)+3O2(g)--> 2CO2(g)+2H2O(l) (kJ/mol)

Hrxn = Hproducts - Hreact

Hprod = 2*-393.509 +2*-285.8 = -1358.618

Hreact = 52.3 +3*0 = 52.3

Hrxn = Hproducts - Hreact = -1358.618 -52.3 = -1410.91 kJ/mol

(b) 2H2S(g)+3O2(g)--> 2H2O(l) +2SO2(g) (kJ/mol)

HRxn = Hprod - Hreact

Hprod = 2*-285.8 +2*-296.84 = -1165.28

Hreact = 2*-20.63 + 3*0 = -41.26

HRxn = Hprod - Hreact = -1165.28--41.26 = -1124.02

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