Question: Hydrides are rare earth metals, M, that have the ability to react with hydrogen to form a different substance MHx with a release of energy.

Hydrides are rare earth metals, M, that have the ability to react with hydrogen to form a different substance MHx with a release of energy. The hydrogen can then be released, the reaction reversed, by heat addition to the MHx. In this reaction only the hydrogen is a gas so the formula developed for the chemical equilibrium is inappropriate. Show that the proper expression to be used instead of Eq. 15.14 is
ln (PH2/Po) = Î”Go/RT when the reaction is scaled to 1 kmol of H2.

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