Standard Enthalpy of Formation for Calcium carbonate?

Question

I need to write a balanced chemical equation for the reaction used to calculate the standard enthalpy formation of CaCO_3.

Thanks in advance.

Answer 1

Standard enthalpy of formation means the enthalpy of formation of 1 mol material from its component elements, all materials in their standard states.

So in this case

Ca(s) + C(graphite) + 3/2 O2(g) >>> CaCO3(s)

it is okay to have a fraction coefficient for the O2, because you are talking about moles, not molecules.

Answer 2

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RE:
Standard Enthalpy of Formation for Calcium carbonate?
I need to write a balanced chemical equation for the reaction used to calculate the standard enthalpy formation of CaCO_3.

Thanks in advance.

Answer 3

hfshaw didn t convert the 160.5 K/Kmol to kJ to use in the equation: dG1 = 177.8*10^3 J/mol - (298.15 K)*160.5J/(mol*K) so I do not believe hfshaw s answer is correct. Instead, the equation should be: dG1 = 177.8*10^3 J/mol - (298.15 K)*0.1605kJ/(mol*K)