Zinc metal reacts with HCI according to the following balanced equation: Zn(s) + 2HCI(aq) --> ZnCl2(aq) + H2(g) When 0.100 grams of Zn(s) is combined with an excess amount of HCI to make 47.0 mL of solution in a coffee-cup calorimeter, all the zinc reacts, raising the temperature of the solution from 21.90°C to 24.70°C. Find AH for this reaction in kJ/mol. Assume the density of the solution is 1.03 g/mL and the specific heat capacity of the solution is 4.184 J/g°C. Use an atomic weight of 65.38 g/mol for Zn Hints: -q(reaction) = q(solution) AH = q/mol of limiting reagent Do not type units with your answer. Type your answer to three significant figures. If this question is on an exam on your scrap paper report your answer to the proper number of significant figures but still type three significant figures online.
Zinc metal reacts with HCI according to the following balanced equation: Zn(s) + 2HCI(aq) --> ZnCl2(aq) + H2(g) When 0.100 grams of Zn(s) is combined with an excess amount of HCI to make 47.0 mL of solution in a coffee-cup calorimeter, all the zinc reacts, raising the temperature of the solution from 21.90°C to 24.70°C. Find AH for this reaction in kJ/mol. Assume the density of the solution is 1.03 g/mL and the specific heat capacity of the solution is 4.184 J/g°C. Use an atomic weight of 65.38 g/mol for Zn Hints: -q(reaction) = q(solution) AH = q/mol of limiting reagent Do not type units with your answer. Type your answer to three significant figures. If this question is on an exam on your scrap paper report your answer to the proper number of significant figures but still type three significant figures online.
Chemistry: Principles and Practice
3rd Edition
ISBN:9780534420123
Author:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Publisher:Daniel L. Reger, Scott R. Goode, David W. Ball, Edward Mercer
Chapter5: Thermochemistry
Section: Chapter Questions
Problem 5.62QE: A 50-mL solution of a dilute AgNO3 solution is added to 100 mL of a base solution in a coffee-cup...
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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.
Question
Transcribed Image Text:Zinc metal reacts with HCI according to the following balanced equation:
Zn(s) + 2HCI(aq)
> ZnCl2(aq) + H2(g)
-->
When 0.100 grams of Zn(s) is combined with an excess amount of HCI to make 47.0
mL of solution in a coffee-cup calorimeter, all the zinc reacts, raising the temperature
of the solution from 21.90°C to 24.70°C. Find AH for this reaction in kJ/mol.
Assume the density of the solution is 1.03 g/mL and the specific heat capacity of the
solution is 4.184 J/g°C.
Use an atomic weight of 65.38 g/mol for Zn
Hints:
-q(reaction) = q(solution)
AH = q/mol of limiting reagent
Do not type units with your answer.
Type your answer to three significant figures.
If this question is on an exam on your scrap paper report your answer to the proper
number of significant figures but still type three significant figures online.
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