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.

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Mathematics

Amaris Johns

26 January, 10:22

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.

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Allyson Massey · Answer 1

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 = - 393*4 + 2*-286 - (-1299*2) = 454 kJ