Answer the following questions A.The enthalpy of formation of ammonia gas is - 46.0kJ / mol . What is the enthalpy change for the reaction: 2NH3->N2+3H2? Choices : 46.0kJ, 92.0 kJ, 23.0 kJ, -92.0 kJ B.Given enthalpy of formation of CO2(g) and CaO are -94.0kJ and - 152kJ respectively, and the enthalpy of the reaction is 42 kJ. Calculate the enthalpy of formation of CaCO3(s) in reaction: CaCO3-> CaO +CO2 choices: -42kJ/mol, -202 kJ/mol, +202 kJ mol, -288 kJ
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.
1. Answer the following questions
A.The enthalpy of formation of ammonia gas is - 46.0kJ / mol . What is the enthalpy change for the reaction: 2NH3->N2+3H2?
Choices : 46.0kJ, 92.0 kJ, 23.0 kJ, -92.0 kJ
B.Given enthalpy of formation of CO2(g) and CaO are -94.0kJ and - 152kJ respectively, and the enthalpy of the reaction is 42 kJ. Calculate the enthalpy of formation of CaCO3(s) in reaction: CaCO3-> CaO +CO2
choices: -42kJ/mol, -202 kJ/mol, +202 kJ mol, -288 kJ/mol
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