Question

A 0.20 M solution of MgSO, has an observed osmotic pressure of 7.6 atm at 25°C. Determine the observed van't Hoff factor i for this experiment a) 1.6 b) 19 c)0.31 d)1.8 e) 2.0

Answer 1

Answer: The correct answer is Option a.

Step-by-step explanation:

To calculate the Vant't Hoff factor, we use the equation for osmotic pressure, which is:

`\pi=icRT`

where,

`\pi` = osmotic pressure of the solution = 7.6 atm

i = Van't hoff factor = ?

c = concentration of
`MgSO_4` = 0.20 mol/L

R = Gas constant =
`0.0820\text{ L atm }mol^(-1)K^(-1)`

T = temperature of the solution =
`25^oC=[273+25]=298K`

Putting values in above equation, we get:

`7.6atm=i* 0.20mol/L* 0.0820\text{ L.atm }mol^(-1)K^(-1)* 298K\\\\i=1.6`

Hence, the correct answer is Option a.