Calculate the freezing-point depression and osmotic pressure at 258C of an aqueous solution containing 1.0 g/L of a protein (molar mass 5 9.0 3 104 g/mol) if the density of the solution is 1.0 g/cm3. b. Considering your answer to part a, which colligative property, freezing-point depression or osmotic pres- sure, would be better used to determine the molar masses of large molecules

0.2 atm is the osmotic pressure.  Decreased freezing point since an exact number of moles could be determined, osmotic pressure would be a better method for determining the molar masses of a big molecule.

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The osmotic pressure is 0.2 atm

The freezing point depression=2*10^-5 \

Osmotic pressure would be better to determine the molar masses of large molecule as precise number of moles can be known.

Explanation:

The equation for the osmotic pressure is the:

π=MRT

 where π= osmotic pressure

           M= Molarity , R= Gas constant, T =temperature

M= 1/9*10^4

   = 1.1*10^-5 mol/litre

    π= MRT

      = 1.1*10^-5*0.0826* 298*760 Torr

       =  0.20 torr

      osmotic pressure= 0.20 atm

ΔTf=Kfm*

 = 1.86*1.1.10^-5

=2.06*10^-5

The osmotic pressure would be better to determine the molar mass from the formula π= MRT

When molarity is known molar mass ie easily known as number of moles would be known and multiplied with atomic weight will give molar mass.

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is and electronic configuration of phosphorous is .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.  

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.