Here are the solutions:
1) Calcuate the molarity when 75.0 grams of MgCl2 is dissolved in 500.0 mL of solution.
2) 100.0 grams of sucrose (C12H22O11, mol. wt. = 342.3 g/mol) is dissolved in 1.50 L of solution. What is the molarity?
3) 49.8 grams of KI is dissolved in enough water to make 1.00 L of solution. What is the molarity?