please help

(A)

An aqueous solution of NH4Cl has a molal concentration of 1.193 mol·kg^-1. Its density is 1.0170 g·mL^-1.

1) Calculate the molar concentration of NH4Cl.

----- mol/L

2)Calculate the mass percent of NH4Cl in the solution.

-----%

3)What is the mole fraction of NH4Cl in the solution?

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(B)

What mass (g) of AlCl3 would have to be dissolved in 150 mL of water to give a solution that has a vapour pressure of 4.63·10^3 Pa at 35°C? Assume complete dissociation of the solute and ideal solution behavior. At 35°C, the vapour pressure of pure water is 5.63·10^3 Pa.

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(C)

What is the approximate osmotic pressure of a 0.1192 mol·kg^-1 solution of LiCl at 10 °C? The freezing point of this solution is -0.415 °C. Express your answer in Pa.

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(D)

The vapour pressure of a mixture of 150 g of acetone and 41.6 g of an unknown compound is 0.866·10^4 Pa at 20 °C. The vapour pressure of pure acetone at 20 °C is 0.737·10^4 Pa, while that of the pure unknown is 1.40·10^4 Pa. What is the approximate molar mass of the unknown?

-----g·mol^-1