10.6 g of a substance of molecular weight 106 was dissolved in 100 ml 10 ml of this solution was pipetted out into a 1000 ml flask and made up to the mark with distilled water. The molarity of the resulting solution is

Options

A. `1.0M`
B. `10^(-2)M`
C. `10^(-3)M`
D. `10^(-4)M`

Answer

(b)

Explanation

Weight of substance `(w)= 10.6g/100 mL = 1.06g/10 mL`
  Molecular weight of substance `(m) - 106 g`
  Volume of the solution (V) = 1000 mL
`Molarity (M) =  xM`
`M=(w xx 1000)/(V)`
`M=(1000 xx 1.06)/(106 xx 1000)`
= `10^(2)`
` therefore Molarity = 10^(2)M`