2Mg(s) + O₂(g) →→→ 2MgO(s) A chemistry student is performing this reaction in a lab, in which magnesium is burned a combines with oxygen from the air to produce magnesium oxide. The student burns 2.92 g of Mg with oxygen from the air. The student incorrectly calcula that the mass of magnesium oxide produced was 9.69g. The work is below: 2.92 g 1 X 1 mol X 24.3 g 2 mol 1 mol 40.3 g 1 mol = 9.69g 1) What did the student do wrong? There is an error in their work. Explain specifically wha part is incorrect. 2) What recommendation(s) would you give to the student regarding showing the work? There is an improvement that can be made to help the student avoid this mistake in the future. 3) Instead of 9.69g, what answer should the student have calculated?
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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