A student dissolves a sample of barium hydroxide to make a 125-mL solution and then titrates it with 50 mL of a 2.5 M hydrochloric acid solution to reach the endpoint. The student wishes to use the reaction of barium hydroxide and hydrochloric acid to produce 432 kJ of heat. The ΔH for this reaction is –54 kJ/mol of HCl, how many grams of barium hydroxide are required?
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.
A student dissolves a sample of barium hydroxide to make a 125-mL solution and then titrates it with 50 mL of a 2.5 M hydrochloric acid solution to reach the endpoint.
- The student wishes to use the reaction of barium hydroxide and hydrochloric acid to produce 432 kJ of heat. The ΔH for this reaction is –54 kJ/mol of HCl, how many grams of barium hydroxide are required?
The balanced equation is
Ba(OH)2 + 2 HCl ----------> BaCl2 + 2 H2O
ΔH for this reaction is –54 kJ/mol of HCl
Heat energy to be produced = 432 kJ
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