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Assume you dissolve 2.56g of malic acid, C4H6O5 in half a liter of water (500g). Calculate the molarity, molality, mole fraction, and weight...

Assume you dissolve 2.56g of malic acid, C4H6O5 in half a liter of water (500g). Calculate the molarity, molality, mole fraction, and weight percentage of acid in the solution.
You want to prepare a solution that is 0.200m in Na2CO3. How many grams of the salt must you add to 125g of water? What is the mole fraction of Na2CO3 in the resulting solution?

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