Given that molar enthalpy of combustion of acetylene (C2H2, 26.04 g/mol) is -1299 kJ/mol at 25 C and 1 atm, which statement below is FALSE? C2H2(g)+ 5/2 O2(g) ----> 2CO2(g)+H2O(l) 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.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Given that molar enthalpy of combustion of acetylene (C2H2, 26.04 g/mol) is -1299 kJ/mol at 25 C and 1 atm, which statement below is FALSE?
C2H2(g)+ 5/2 O2(g) ----> 2CO2(g)+H2O(l)
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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