Question

an aqueous solution contains 0.72 into 10 raise to minus 2 kg of calcium chloride and 0.09 kg of water calculate the mole fractions of calcium chloride and water in the solution​

Answer 1

Answer:

According to Van't Hoff's equation, the osmotic pressure

Π=iCRT=

V

in

B

RT

.

Here, i is the Van't Hoff's factor, C is the molar concentration, R is the ideal gas constant, T is temperature, nB is the number of moles of calcium chloride and V is the volume of the solution.

Now we have given below values:

π = 0.75 atm

V = 2.5L

i = 2.47

T = (27+273) K = 300K

and R = 0.0821L atm k

−1

mol

−1

0.75=

2.5

2.47×n

B

×0.0821×300

n

B

=0.0308 mol

The molar mass of calcium chloride is 111 g/mol.

Amount of calcium chloride dissolved =0.0308×111=3.42 g.