Calculate Triangle G degree rxn for the following reaction: CaCO3(s) arrow CaO(s

Question

Calculate Triangle G degree rxn for the following reaction: CaCO3(s) arrow CaO(s) CO2(g) . Use the following reactions and given values: Ca(s)CO2(g)1/2(g) arrow CaCO3(s) , Triangle G degree rxn - 734.4 kJ 2Ca(s)O2(g) arrow 2CaO(s) , Triangle G degree rxn - 1206.6 kJ

Explanation / Answer

the 2nd of the 3 euations can be written as , CaCO3 --> Ca + CO2 + 1/2 O2 ; dG = 734/4 kJ ; or 2CaCO3 --> 2Ca + 2CO2 + O2 ; dG = 2 * 734/4 kJ ; ---------1 3rd of the 3 equations can be wrtitten as 2 Ca + O2 ---> 2 Ca O ; dG = -1206.6 kJ --------------2 adding 1 and 2 , we get the 1st of the 3 equatoins 2 CaCO3 ---> 2 CaO + 2 CO2 ; dG = 2 * 734.4 -1206.6 kJ dG = 262.2 kJ for 1 CaCO3 , dG = 262.2 / 2 = 131.1 kJ

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