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Chemistry class 12th Thermochemical_Data_and_Electrode_Potentials

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Thermochemical data and electrode potentials are essential in understanding chemical reactions, particularly redox processes. Thermochemical data include enthalpy (), entropy (), and Gibbs free energy (), which predict reaction spontaneity. Electrode potentials () measure a substance’s tendency to gain or lose electrons, indicating its strength as an oxidizing or reducing agent. The Nernst equation relates electrode potential to concentration. Standard electrode potentials (SHE reference) help compare different redox couples. Combining thermochemical and electrochemical data allows calculation of cell potential () and equilibrium constants, aiding in fields like energy storage, corrosion, and electrolysis.

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Thermochemical Data and Standard Electrode Potentials

For the First-Row Transition Elements



Element Ionization Enthalpy (kJ/mol) Hydration Enthalpy (kJ/mol)
Standard Reduction Potential (E° M2+/M, V)

Scandium (Sc) 631 -4020 -2.08

Titanium (Ti) 656 -4390 -1.63

Vanadium (V) 650 -4600 -1.18

Chromium (Cr) 653 -4065 -0.91

Manganese (Mn) 717 -3730 -1.18

Iron (Fe) 762 -4410 -0.44

Cobalt (Co) 760 -4240 -0.28

Nickel (Ni) 737 -4040 -0.25

Copper (Cu) 745 -2100 +0.34

Zinc (Zn) 906 -2045 -0.76
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Ramashish Paul NCERT Examplar Chemistry Class 12th
Publisher: 2019 ISBN: 9789351764649 Edition: Unknown

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