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Whelan Whelan
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Posts: 3158
7 years ago
Calculate the electron affinity for the formation of the hydride ion from the following information:

   H(g) + e- → H-(g)   ?
   1/2 H2(g) → H(g)   +217.9 kJ/mol
   Na(s) → Na(g)   +107.3 kJ/mol
   Na(g) → Na+(g) + e-    +495.8 kJ/mol
   Na(s) + 1/2 H2(g) → NaH(s)   -60.0 kJ/mol
   NaH(s) → Na+(g) + H-(g)   +810.9 kJ/mol

A) -50.1 kJ/mol
B) -70.1 kJ/mol
C) -816 kJ/mol
D) -1632 kJ/mol
Textbook 

Introductory Chemistry Essentials


Edition: 5th
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hbutler2hbutler2
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7 years ago
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More solutions for this book are available here
B

The parameters are given ;

Hess's law states that the standard reaction enthalpy is the sum of the standard enthalpies of the intermediate reactions into which the overall reaction can be divided, while each occurs at the same temperature. The standard enthalpy of an overall reaction is the sum of the enthalpy changes in individual reactions.


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