# chemistry

posted by Boris

A method for scrubbing CO2(g) from the air on a spacecraft is to allow CO2(g) to react with NaOH according
to the following (unbalanced reaction).
NaOH(s) + CO2(g) → Na2CO3(s) + H2O(l)
Use the appropriate thermodynamic tables to calculate the enthalpy, entropy and standard Gibbs free energy
at 298K. (For the solid sodium carbonate, you need to use the following data: Molar heat capacity at constant
pressure 112.3 J/(mol K), Standard molar entropy 135 J/(mol K), Standard molar enthalpy of formation -1130.7
kJ/mol)
Any help to figure this out would be great I don't even know where to start

1. DrBob222

The problem doesn't say so but implies you want the dH, dS, dG FOR THE REACTION.
1. You have the equation, balanced it.
2. dHrxn = (n*dHf products) - (n*dHf reactants)
3. dSrxn = (n*dSf procuts) - (n*dSf reactants)
4. Then dGrxn = dHrxn - TdSrxn. Substitute and solve for dG.
Post your work if you get stuck.

The dHf and dSf you will need for Na2CO3 is listed in the problem. I presume the others are listed in your text/notes.

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