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Using the thermodynamic data in the Appendix of Atkins

Using the thermodynamic data in the Appendix of Atkins, find the numerical value for K for each of the following reactions at T = 298. K and at T = 350. K.  


a) CaCO_3(s, calcite) ⇌ Ca^2+(aq) + CO_3^2-(aq)  

b) 2 NO_2(g) ⇌ N_2O_4(g)

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