Kayanne M. answered • 03/01/22
Tutor
5
(18)
Ph. D. in Chemistry with 12 years of teaching experience
Ruth,
There's a typo, so you could be asking for molarity or molality. Which are you interested in? It seems more like molarity but checking to be sure.
Kayanne M.
tutor
Okay... convert the 50 g to moles by using the molar mass of calcium chloride. The molar mass is based on the number at the bottom of each element in the periodic table. So for calcium chloride, which is CaCl2, (1 x Ca) + (2 x Cl) = 110.98 g. Divide 50 by this number to get the moles.... = 0.45 moles. Next convert the volume to liters by dividing by 1000 .... 250/1000 = 0.25 L. Moles/L = molarity, so 0.45 mols/0.25 L = 1.8M
The molarity of the solution is 1.8 M. The formula CaCl2 has 1 Ca for every 2 Cl, so the molarity of the calcium ion = 1 x 1.8 M = 1.8 M.
Hope this helps and makes sense.
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03/01/22
Ruth K.
Is molarity03/01/22