1) What is the heat change when 4.72 g of Carbon reacts with excess O2 according to the following equation? C + 02 CO2 AH = -393.5kJ Classification: 2) What is the heat change when 1.48 g of Chlorine reacts with excess phosphorus according to the following equa 2P + 5Cl2 2PCI5+ 886kJ Classification: 3) What is the heat change when 13.7 g of Nitrogen reacts with excess O2 according to the following equation? N2 + O2 - 2NO AH° = -180kJ Classification: 4) What is the heat change when 18.6 g of Hydrogen reacts with excess O2 according to the following equation? 2H2 + O2 → H20 + 571.6kJ Classification:
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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