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a sample aqueous solution of iron(iii) sulfate has a mass of 200g, a density of 1.05...

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Chemistry

a sample aqueous solution of iron(iii) sulfate has a mass of200g, a density of 1.05 g/cm^3 and 8.35 x10^21 atoms of sulfur.What is the molarity of the solution?

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4.3 Ratings (840 Votes)

Fe2(SO4)3

1mole of Fe2(SO4)3 contains 3 moles of S

6.023*10^23 molecules of Fe2(SO4)3 contains 3* 6.023*10^23 of S

3 * 6.023*10^23 molecules of S present in 6.023*10^23 molecules of Fe2(SO4)3

8.35*10^21 molecules of S present in 6.023*10^23*8.35*10^21/3*6.023*10^23    = 2.78*10^21 molecules of Fe2(So4)3

6.023*10^23 molecules of Fe2(SO4)3 = 400g

2.78*10^21 molecules of Fe2(SO4)3 = 400*2.78*10^21/6.023*10^23   = 1.85g of Fe2(SO4)3

volume of solution = mass of solution /density

                              = 200g/1.05g/cm^3    = 190.5cm^3

molarity =   W*1000/G.M.Wt* volume of solution in ml

                = 1.85*1000/400*190.5 = 0.0243M >>>>answer
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