2.5 mol of aluminum chloride is dissolved in 750mL of solution.  Determine the concentration of chloride. A) 0.0033 mol/L  B) None of these C) 10 mol/L  D) 3.3 mol/L 

First, he standardized the AgNO₃ titrant with 0.1242 g dry NaCl dissolved in 25.0 ml DI water, and 26.25 ml of titrant was consumed. Then he used the standardized titrant to determine the concentration of chloride in the solution. 11.71 ml of AgNO₃ solution was used to titrate 25.00 ml of solution

a) Calculate the concentration (M) of AgNO₃ titrant.

b) Determine the content of chloride in the unknown solution (M).

A chemist prepares a solution of aluminum chloride AlCl3 by measuring out 150.g of aluminum chloride into a 500.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in /molL of the chemist's aluminum chloride solution. Round your answer to 3 significant digits.