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What is the osmotic pressure of a 0.050 M solution of AlCl3 in water that is at 0.00C?

What is the osmotic pressure of a 0.050 M solution of AlCl3 in water that is at 0.00C?  Consider AlCl3 to be a strong electrolyte.
A- 8.5 * 102 torr
B- 1.1 atm
C- 2.2 atm
D- 3.4 * 103 torr
As NH4NO3 dissolves in water, the resulting solution becomes colder.  Which of the following expressions is most correct?
A- NH4NO3 NH + NO + heat
B- Heat + NH4NO3NH + NO
C- NH4NO3  NH + NO
D- NH4NO3 + heat  NH + NO + heat

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