Can you help me answer this and make sure it's in the right significant figure

242 Experiment 28 Determining the Hardness of Water 3. A 100.-mL sample of hard water was titrated with the EDTA titrant solution from Problem 2. The same amount of Mg2+ was added, and the volume of EDTA required was 39.84 mL. What volume of EDTA was used in titrating the Ca2* in the hard water? V= Final - Initail V = 39.84ML - 2. 72 ML = 37:07 ml 37.07 ml b. How many moles of EDTA are there in that volume ? () M = moles ( C ) 37.07 me (,, ooma) = 0 03707 6 moles = MXL moles = 0:107M X 6-03707C 2 0.0639 6649 0- 00397 moles C. How many moles of Cast and Mg2+ (hardness) ions are there in 100. mL of the hard water? 1: 1 mole ratio moles of EDTA = Moles cart and reget moles d. If the hardness all comes from CaCO3, how many moles of CaCO, would there be in one liter of this hard water? How many grams of CaCO, would be present per liter of this hard water? (The molar mass of CaCO, is 100.1 g/mol.) 0. 0039 7 moles 100 ML 20.0397 moves IL 0: 6397 mol / - 100.19/MCI) 1 mol mol/L g/L e. If 1 ppm = 1 mg per liter, what is the water hardness, in ppm of CaCO, equivalents? (1 g = 1000 mg) ppm CaCO3