Question

How many grams does f Cacl2 should be dissolved in 750.0 mL of water to make a 0.100 M solution Cacl2

Answer 1

8.324 g

Step-by-step explanation:

First we convert 750.0 mL into L:

• 750.0 mL / 1000 = 0.750 L

Then we calculate the required number of moles of CaCl₂, using the definition of molarity:

• Molarity = moles / liters

• Molarity * liters = moles

• 0.100 M * 0.750 L = 0.075 mol

Finally we convert 0.075 moles of CaCl₂ into grams, using its molar mass:

• 0.075 mol * 110.98 g/mol = 8.324 g