hello everyone, i have been working o n these 3 problems since monday and i have yet to get the rigth answers. I am getting very frustrated.. and i need every point i can get in this class just in case i do bad on an exam. please help, with these questions. Of course the book examples are easy.. but the homework ones seem insane.
1. You are asked to prepare an aqueous solution of ethylene glycol (HOCH2CH2OH) with a mole fraction of 0.199.
If you use 569 g of water, what mass (in g) of ethylene glycol should you use?
What is the molality of the resulting solution?
2. At 25oC, the equilibrium pressure of HCl vapor above a 0.100 M aqueous solution of HCl is 4.0 torr.
Calculate the Henery's law constant.
What is the equilibrium pressure (in torr) of HCl vapor above a 6.81 M solution?
3. A solution contains 11.00 g of sucrose (C12H22O11) in 161 mL of water. Assume the density of water is 1.00 g/mL.
Calculate the freezing point of the solution. The normal freezing point of water is 0.00 oC. The Kf of water is 1.858 oC kg/mol.
Calculate the boiling point of the solution. The normal freezing point of water is 100.00 oC. The Kb of water is 0.512 oC kg/mol.