# What is the molarity of a 18.00% by mass aqueous solution of potassium phosphate, K3PO4? The density

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## Question:

What is the molarity of a 18.00% by mass aqueous solution of potassium phosphate, K3PO4? The density of the solution is 1.094 g/mL. The molar mass of K3PO4 is 212.27 g/mol. Show ALL work for credit. Report your answer to 4 significant figures and include units.

What is the molality NaCl of a solution made by dissolving 0.1900 moles of NaCl in 12.50 moles of water? The density of water is 1.000 g/mL and the density of NaCl is 2.165 g/mL. The molar mass of NaCl and water are 58.44 and 18.016 g/mol, respectively. Show ALL work for credit. Report your answer to 4 significant figures and include units.

At a given temperature, the vapor pressure for butanol is 6.98 torr and for ethanol is 93.00 torr. What do you expect the vapor pressure (in torr) to be for a solution made from the two if the solution is 25.00% butanol by mole? Assume ideal behavior. Show ALL work for credit. Report your answer to 2 decimal places and include units.

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