Mg(s)  +  2HCl(aq) → MgCl2(aq)  +  H2(g) The temperature increases from 23.00 to 33.10 °C as a result of this reaction. Assume that the solution has a specific heat of 4.184 J/g·°C. The heat capacity of the calorimeter is 71.3 J/K.   (a) Calculate the heat absorbed by the calorimeter (in J) during this experiment.   (b) Calculate ∆rH for this reaction (in kJ/mol-rxn), from the experimental observations

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 5.24QE
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100.0 mL of 0.210 M HCl reacts with excess magnesium metal to make 100.0 mL of solution (density = 1.00 g/cm3) in a constant-pressure calorimeter. The following reaction occurs:
Mg(s)  +  2HCl(aq) → MgCl2(aq)  +  H2(g)
The temperature increases from 23.00 to 33.10 °C as a result of this reaction.
Assume that the solution has a specific heat of 4.184 J/g·°C.
The heat capacity of the calorimeter is 71.3 J/K.
 
(a) Calculate the heat absorbed by the calorimeter (in J) during this experiment.
 
(b) Calculate ∆rH for this reaction (in kJ/mol-rxn), from the experimental observations

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