The freezing-point depression of a 0.100 m MgSO4 solution is 0.225°C. Determine the experimental van't Hoff factor of MgSO4 at this concentration. (Kf of water is 1.86°C/m)

The experimental van't Hoff factor is 1.21

Explanation:

The expression for the depression in freezing point is given as:

where,

i = van't Hoff factor = ?

= depression in freezing point  = 0.225°C

= Cryoscopic constant  = 1.86°C/m

m = molality of the solution = 0.100 m

Putting values in above equation, we get:

Hence, the experimental van't Hoff factor is 1.21

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the enthalpy of formation of water is given as -285.8kj/mol, which states that the enthalpy of formation is negative.

negative enthalpy of formation indicates that the heat is released during the reaction process. the heat is released from reaction to the surroundings the enthalpy is expressed with a negative sign with the energy given out in the reaction process.

the formation of water takes place by giving out heat which is -285.8 kj/mol.