1- An aqueous solution of 10.10 g of catalase, an enzyme found in the liver, has

Question

1- An aqueous solution of 10.10 g of catalase, an enzyme found in the liver, has a volume of 1.04 L at 27°C. The solution's osmotic pressure at 27°C is found to be 0.745 torr. Calculate the molar mass of catalase.

2- Toluene and benzene form ideal solutions. Consider a solution of toluene and benzene prepared at 25°C. Assuming that the mole fractions of toluene and benzene in the vapor phase are equal, calculate the composition of the solution. At 25°C the vapor pressures oftoluene and benzene are 28 and 95 torr, respectively.

Explanation / Answer

2) the vapour presssure is propotional to mole fraction qualitatively the most volatile is most present vapour phase

xL benzene x 95 = p benzene= xL toluene x 28

in the other terms the two liquid fractions are inversly propotional to vapour presssure of pure liquids

the sum

xL benzene + xL roluene = 1 and we have two equations in two unknows

xL bennzene / xL toluene = 28/95 = 0.29

1-xL toluene = 0.29xL toluene

xL toluene = 1/1.29 = 0.775 and so xL benzene = 0.25

1) its 85.8% of the total (257)torr so that 225 torr pressure of CS2 / p CS2 (not) or the vapour pressure = ratio

225/361 = 0.623

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