Given That Molar Enthalpy of Combustion of Acetylene (C₂H₂,26

question 123

Multiple Choice

Given that molar enthalpy of combustion of acetylene (C₂H₂,26.04 g/mol) is -1299 kJ/mol at 25°C and 1 atm,which of the following is false?

• 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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