Asked by Derek
When magnesium hydrogen carbonate reacts with sulfuric acid, would you consider that an exothermic reaction because it forms CO2 (gas)?
Answers
Answered by
DrBob222
It IS an exothermic reaction but I don't know that the release of CO2 is the reason. The entropy is +.
Answered by
Derek
Just out of curiosity, how would you figure out the delta g if you didn't know the delta h? I don't think it is possible, is it? And also, can you explain how you knew it was exothermic?
Answered by
DrBob222
I know it is exothermic because I've been there and done that and I know it gets hot.
You can look up delta G of products and reactants in tables and calculate delta Grxn BUT those values are based on knowing both delta H and delta S so I don't think that is a legitimate answer.
The only other two ways I know are (a) to know or measure the equilibrium constant, then use dG = -RTlnK or (b) know, calculate, or measure the Eo value for the reaction, then use
dG = -nFEo. Of course these should count only as ONE way because K values often are determined by using Eo values.
You can look up delta G of products and reactants in tables and calculate delta Grxn BUT those values are based on knowing both delta H and delta S so I don't think that is a legitimate answer.
The only other two ways I know are (a) to know or measure the equilibrium constant, then use dG = -RTlnK or (b) know, calculate, or measure the Eo value for the reaction, then use
dG = -nFEo. Of course these should count only as ONE way because K values often are determined by using Eo values.
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