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step by step answer please Example: Calculate A,H Zn(S)+Cu²+ (aq) = Zn²+ (aq)+Cu(S) m

Chemistry: Matter and Change

1st Edition

ISBN:9780078746376

Author:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Publisher:Dinah Zike, Laurel Dingrando, Nicholas Hainen, Cheryl Wistrom

Chapter15: Energy And Chemical Change

Section: Chapter Questions

Problem 102A

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Concept explainers

Electrolysis

Electrolysis is defined as the process of breaking down ionic compounds into their constituent elements by passing a direct electric current through the compound in a fluid state. The cathode reduces cations, while the anode oxidizes anions. An electrolyte, electrodes, and some form of external power source are the main components required for conducting electrolysis. A partition, such as an ion-exchange membrane or a salt bridge, may also be used, but this is optional. These are primarily used to prevent the products from diffusing near the opposing electrode.

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Zn(S)+Cu²+ (aq) = Zn²+ (aq)+Cu(S)

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a. Calculate the theoretical heat of reaction between the Zn and copper sulphate using the following enthalpy of formations: Formula is: ΔH0rxn = ∑nΔH0f (products) - ∑n (reactants) Zn(s) – (0 kJ/mol) ZnSO4 (aq) - (-152.4kJ/mol) Cu(s) – (0 kJ/mol) CuSO4 (aq) – (64.77 kJ/mol) Answer: Theoretical heat of reaction = -217.17 kJ/mol b. In an experiment, 2 grams of zinc and 150 mL aq CuSO4 were made to react, then as observed, the temperature rises from 300C to 410C. What is the heat of the reaction between the zinc and copper sulphate (in kJ/mole)? Is the value near the theoretical value (found in item a)? Note: Answer the problem b only and relate to its question.
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