Following is the chemical equation of ethene combustion: C2 H4(g) + 302(g) → 2CO2(g) + 2H20(1) AH = - 0.337kcal If 70% of the energy released from the combustion can be used, then, what is the mass (in the unit of kg) of water that can be converted from liquid water at 20°C to 99 °C by burning 1m3 of C2H4 under standard temperature and pressures? (The specific heat capacity of liquid water is 4.184 J/(gK), 1 kcal = 4184 J. Keep 3 significant figures for the final answer.)
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.
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