According to the explanation given in a previous session, now we have to use the same molarity formula to find the number of moles of CaCl2, let's set up the formula and add the values:
M = n/V
4.9 = n/0.750
n = 4.9*0.750
n = 3.675 moles of CaCl2
Now to find the mass in grams, we need both the number of moles, 3.675 moles, and also the molar mass of CaCl2, which is, 110.98g/mol
110.98g = 1 mol
x grams = 3.675 moles
x = 407.85 grams of CaCl2