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Given That Molar Enthalpy of Combustion of Acetylene (C2H2, 26 °\degree

Question 83

Multiple Choice

Given that molar enthalpy of combustion of acetylene (C2H2, 26.04 g/mol) is -1299 kJ/mol at 25 °\degree C and 1 atm, which statement below is FALSE? C2H2(g) +52O2(g) 2CO2(g) +H2O() \mathrm{C}_{2} \mathrm{H}_{2}(g) +\frac{5}{2} \mathrm{O}_{2}(g) \rightarrow 2 \mathrm{CO}_{2}(g) +\mathrm{H}_{2} \mathrm{O}(\ell)


A) The enthalpy of the reactants is lower than that of the products.
B) The amount of heat released is proportional to the amounts of reactants.
C) When 104 g C2H2 combusts, about 5200 kJ of heat is released.
D) The enthalpy of combustion per gram acetylene is-49.9 kJ/g.
E) To form 2 mol C2H2 and 5 mol O2 from 4 mol CO2 and 2 mol H2O, 2598 kJ of energy is required.

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