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The heat combustion of acetylene, C2H2(g), at 25°C, is –1299 kJ/mol. At this temperature, ΔHvalues for CO2(g) and H2O(l) are –393 and –286 kJ/mol, respectively. Calculate ΔHfor acetylene.

Verified Answer :

meerkat18

 The enthalpy of the reaction in an aqueous solution can be
determined by taking the difference between the summation of enthalpies of the
products multiplied to their respective stoichiometric coefficient and the
summation of enthalpies of the reactants multiplied to their respective  stoichiometric coefficient. The equation is 2C2H2 + 5O2 >>> 4CO2 + 2H2O. Hence the enthalpy calculation is delta H = –3934 + 2-286 -(-1299*2) = 454 kJ

Using the information in the table to the right, calculate the enthalpy of combustion of each of the following substances:  acetylene:       ⇒ -1,256 kJ/mol
ethanol:       ⇒ -1,277 kJ/mol  This is from a different problem on Edgenuit.y but hope this helps someone who couldn’t find the answer like me.

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