The freezing point of pure benzene is 5.5 o C. If 37 g TPP (tetraphenylporphryin, C44H30N4, MM = 614.7 g/mol) is dissolved in 250 grams of benzene, what is the freezing point of the new solution? Note: kf = 5.12 o C/m.

The freezing point of the new solution is

Explanation:

Depression in freezing point :

Mass of solute (tetraphenylporphryin) = 37 g

Mass of benzene  = 250 g = 0.25 kg      (1 kg = 1000 g)

Formula used :

where,

= change in freezing point =

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

= freezing point constant = 5.12 K.kg/mole

m = molality

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

Thus the freezing point of the new solution is

answer is: naturally occurring solid, inorganic compound or element is mineral.

minerals usually have crystalline form, that means than crystal constituents (atoms, molecules or ions) are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.

for example magnetite is a mineral of iron oxide (fe₂o₃).

calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (caco₃).

dolomite is an   carbonate mineral composed of calcium magnesium carbonate (camg(co₃)₂).