A certain aqueous solution of `FeCl_3` [formula mass = 162] has a density of 1.1 g/mL and contains 20.0% FeCiz. Molar concentration of this solution is

Options

A. 0.028
B. 0.163
C. 1.357
D. 1.47

Answer

C

Explanation

`20% FeCl_3` solution means 100 g of solution contains 20 g `FeCl_3`.
`implies " Volume of 100 g solution " = (100 g)/(1.1 g//mL)=90.91 mL`
Moles of 20 g `FeCl_3 = 20/162 = 0.1234`
`implies` Molar concentration of solution
`= (0.1234)/(90.91)xx1000 = 1.357 M`