I need help with molarity problem
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I need help with molarity problem

[From: ] [author: ] [Date: 11-06-27] [Hit: ]
how many manganese ions would be in your sample?-MnSO4 ∙ 4H2O, molec wt = 223.(M) (0.2500 L) = 35.53 g / 223.......
35.53g of Manganese sulphate tetrahydrate were dissolved in 250.0 mL of water. What was the molarity of the solution? If you were to take a 25.00mL sample of the solution, how many manganese ions would be in your sample?

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MnSO4 ∙ 4H2O, molec wt = 223.0582 g/mol

MV = grams / molec wt

(M) (0.2500 L) = 35.53 g / 223.0582 g/mol

M = 0.6637 mol/L

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moles = MV

x = (0.6637 mol/L) (0.02500 L)

x = 0.0165925 mol of Mn^2+ ions (remember that there is a one to one molar ratio between MnSO4 and Mn^2+ ion in solution)

0.0165925 mol times 6.022 x 10^23 ions / mol = the answer you seek
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