The molecular formula of a commercial resin used for exchanging ions in water softening is `C_(8)H_(7)SO_(3)Na(mol. Wt. 206)` . What would be the maximum uptake of `Ca^(2+)` ions by the resin when expressed in mole per gram resin?

Options

A. `(2)/(309)`
B. `(1)/(412)`
C. `(1)/(103)`
D. `(1)/(206)`

Answer

B

Explanation

2 mole of water softner require 1 mole of `Ca^(2+)` ion
So, 1 mole of water softner require `(1)/(2)` mole of `Ca^(2+)` ion
Thus, `(1)/(2 xx 206)=(1)/(412) mol // g` will be maximum uptake