What is the molarity of a CaCl2 solution containing 150g of CaCl2 in 400 mL?

you have a 3.17molal solution: This is 3.17mol CaCl2 dissolved in 1 litre of water. Make this solution.  

Molar mass CaCl2 = 110.9848 g/mol

3.17mol = 3.17*110.9848 = 351.822g  

Total mass = 1000g H2O + 351.822g CaCl2 = 1,351.822g  

Volume of this solution:

Volume = mass / density

Volume = 1,351.822/1.24  

Volume = 1,090.2 mL  

You have 3.17mol CaCl2 dissolved in 1,090.2 mL solution

Mol CaCl2 dissolved in 1000mL solution =  1000/1090.2*3.17 = 2.91 mol CaCl2  

Molarity of CaCl2 solution = 2.91M

Explanation:

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