CHEM HELP RIGHT NOW PLEASE

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n the titration of 25.00 ml of a water sample, it took 20.590 ml of 4.995x10-3 M EDTA solution to reach the endpoint. Complete the questions below:
Calculate the number of moles of EDTA required to titrate the water sample. (enter your answer with 3 significant figures)

0.000103
You are correct.
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The total hardness is due to one or a combination of Ca2+, Mg2+, and Fe2+ in your sample. It is convenient to express this hardness as though it was entirely due to Ca2+. Making this assumption, determine the number of moles of Ca2+ present in the bottled water sample titrated.

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