When 9.72 g of an unknown non-electrolyte is dissolved in 50.0 g of cyclohexane, the boiling point increased to 84.93 degrees c from 80.7 degrees c. if the kbp of the solvent is 2.79 k/m, calculate the molar mass of the unknown solute.

Answer : The molar mass of unknown compound is 128.22 g/mole

Explanation :

Mass of unknown compound = 9.72 g

Mass of solvent = 50.0 g

Formula used :

where,

= elevation in boiling point

= temperature of solvent =

= temperature of solution =

i = Van't Hoff factor = 1 (for non-electrolyte)

= boiling point constant for solvent = 2.79 K/m

m = molality

Now put all the given values in this formula, we get:

Therefore, the molar mass of unknown compound is 128.22 g/mole

the old price per ounce is c/4.

the new price per ounce is c/3.6.

the ratio of the old price to the new one is

(c/4)/(c/3.6) = (c/c)×(3.6/4) = 0.9 . . = 9/10 . . "nine tenths" in either form

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.