The chemical weathering of grossular garnet (Ca_3Al_2Si_3O_12 (s)) is a common r

Question

The chemical weathering of grossular garnet (Ca_3Al_2Si_3O_12 (s)) is a common reaction in soils and forms the clay mineral kaolinite (Al_2Si_2O_5(OH)_4 (s)). At standard conditions, which mineral is more stable when in contact with a ground water comprising: Calculate the equilibrium constant for the reaction at standard conditions. The reaction is not in equilibrium at standard conditions. Is the groundwater supersaturated or undersaturated with respect to kaolinite? Using the van't Hoff equation, calculate the equilibrium constant for the reaction between grossular garnet and kaolinite at 250 degree C. The enthalpy for the reaction at standard conditions is Delta H degree_r = -268.48 kJ

Explanation / Answer

=

=

where K is the equilibrium constant, T is temperature, H is the enthalpy of the reaction and R is the gas constant.

where K is the equilibrium constant, T is temperature, H is the enthalpy of the reaction and R is the gas constant.

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