Question

a. The nonvolatile, nonelectrolyte **chlorophyll**,
**C _{55}H_{72}MgN_{4}O_{5}**
(

Calculate the osmotic pressure generated when

The molarity of the solution is _____ M.

The osmotic pressure of the solution is _______atmospheres.

b. The nonvolatile, nonelectrolyte **chlorophyll**
, **C _{55}H_{72}MgN_{4}O_{5}**
(

How many grams of

_______ grams

Answer #1

1) osmotic pressure=P=cRT c=conc of solution,

C=molarity=moles/volume

Moles=10.4g/(893.50 g/mol)=0.01164 moles

Molarity=0.01164 moles/184 ml=0.01164 mol/0.184 L=0.0632 M

P=0.0632 mol/L * 0.0821 L atm/K mol * 298K=1.548 atm

2)Let x grams of chlorophyll are needed to generate an osmotic pressure of 1.21 atm

Molarity=c=moles/volume

Moles=x/(893.50 g/mol)

Molarity= x/(893.50 g/mol)*1/0.236 L=x/210.866 M

osmotic pressure=P=cRT = x/210.866 mol/L RT

1.21 atm= x/210.866 mol/L * 0.0821 L atm/K mol*298K

X=9.653 g

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