The stems and leaves of many plants contain oxalic acid (H2C2O4) or sodium oxalate. A standard analysis for determining the amount of oxalate ion (C2O4 -2) in a sample is to precipitate oxalate out with the calcium ion. The reaction often involves the following reactants. Complete the following information for this reaction. Sodium oxalate and calcium chloride
Balanced Equation:
Total Ionic Equation:
Net Ionic Equation:

the answer to your question is c.

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there are two significant figures.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.