Thermodynamic data that may be useful in solving this problem are tabulated below.

Values are for $25C$ and $1$ bar pressure.

$($a$)$ Write the reaction that represents the formation of calcite $(CaC{O}_3)$ from the el$-$

ements in their most stable states at $25C$ and $1$ bar pressure, and compute $S_r$

for the reaction. Ilint: the thermodynamic data in the table can help you deter$-$

mine which species are in their most stable states according to thermodynamic

conventions.

$($b$)$ How are $I_f$ and $G_f$ for calcite related to $I_r$ and $G_r$ for your reaction

in question $2$a$?$ Why is this relationship unique for how you've written your

reaction and may not be generally found for all reactions? Ilint: subscripts for

thermodynamic parameters are important for showing what kind of reaction $/$

quantity the parameter represents. Think about the subscripts in this problem to

help you find the unique relationship.