Final answer:
To calculate the number of grams of CaCl₂ needed to produce a certain molarity of solution, use the formula: grams = (molarity x volume x molar mass) / 1000. In this case, approximately 5.5245 grams of CaCl₂ are needed to produce 250.0 mL of a 0.200-M solution of calcium chloride.
Step-by-step explanation:
To calculate the number of grams of CaCl₂ needed to produce a certain molarity of solution, we can use the formula:
grams = (molarity x volume x molar mass) / 1000
In this case, the molarity is 0.200 M, the volume is 250.0 mL (which should be converted to liters), and the molar mass of CaCl₂ is 110.98 g/mol. Plugging in these values, we get:
grams = (0.200 mol/L x 0.250 L x 110.98 g/mol) / 1000 = 5.5245 g
Therefore, approximately 5.5245 grams of CaCl₂ are needed to produce 250.0 mL of a 0.200-M solution of calcium chloride.