The experimentally determined molar mass of a non- volatile solute, `BaCl_(2)` in water by Cottrell's method,is

Options

A. Equal to the calculated 1itolar mass
B. More than the calculated molar mass
C. Less than the calculated molar mass
D. Double of the calculated molar mass

Answer

(c )

Explanation

`BaCl_(2) rarr Ba^(2+) +2Cl^(-)`
`BaCl_(2)` gives 1 Ba `Ba^(2+)` ion and 2 Cl ions.
`:.`Number of particles increases in the solution.`i = M_(c)/M_(o)`
`=3/1`
`rArr M_(c)/M_(o) = 3/1 `
`rArr M_(c) = 3M_(o)` i.e.,`M_(o)ltM_(c)`