The freezing point of benzene c6h6 is 5.50°c at 1 atmosphere. a nonvolatile, nonelectrolyte that dissolves in benzene is ddt . how many grams of ddt, c14h9cl5 (354.5 g/mol), must be dissolved in 209.0 grams of benzene to reduce the freezing point by 0.400°c ?

0.028 grams

Explanation:

Depression in freezing point :

Formula used for lowering in freezing point is,

or,

where,

= change in freezing point

= freezing point constant  (for benzene} =

m = molality

Putting in the values we get:

0.028 grams of DDT (solute) must be dissolved in 209.0 grams of benzene to reduce the freezing point by 0.400°C.

1 is the answer to this problem