Work is done in this reaction when the H2 gas expands out of the test tube and pushes the atmosphere aside. W = PV where W = work, P = pressure, V = Vfinal - Vinitial work done with one mole of Mg reacts with excess acid at STP= 314.1J Q1: Assuming the same amount of Mg reacted, which value should be larger - the heat measured under constant pressure conditions or the heat measured under constant volume conditions? Explain. Q 2: The literature value for the heat produced when Mg reacts with H+ under constant pressure conditions is - 110 kcal/mol. Calculate the accuracy obtained from this experiment
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.
Chemistry
Work is done in this reaction when the H2 gas expands out of the test tube and pushes the atmosphere aside. W = PV where W = work, P = pressure, V = Vfinal - Vinitial
work done with one mole of Mg reacts with excess acid at STP= 314.1J
Q1: Assuming the same amount of Mg reacted, which value should be larger - the heat measured under constant pressure conditions or the heat measured under constant volume conditions? Explain.
Q 2: The literature value for the heat produced when Mg reacts with H+ under constant pressure conditions is - 110 kcal/mol. Calculate the accuracy obtained from this experiment.
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