When 24.8g of alanine C3H7NO2 are dissolved in 1050.g of a certain mystery liquid X, the freezing point of the solution is 7.40°C less than the freezing point of pure X.Calculate the mass of iron(III) nitrate FeNO33 that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor =i3.60 for iron(III) nitrate in X.Be sure your answer has a unit symbol, if necessary, and round your answer to 3 significant digits.
When 24.8g of alanine C3H7NO2 are dissolved in 1050.g of a certain mystery liquid X, the freezing point of the solution is 7.40°C less than the freezing point of pure X.Calculate the mass of iron(III) nitrate FeNO33 that must be dissolved in the same mass of X to produce the same depression in freezing point. The van't Hoff factor =i3.60 for iron(III) nitrate in X.Be sure your answer has a unit symbol, if necessary, and round your answer to 3 significant digits.
First of all we calculate the value of Kf of mystery liquid X, by following formula -
∆Tf = i Kf mass of solute × 1000/molar mass of solute× mass of solvent
Kf = ∆Tf molar mass of solute×mass of solvent/i mass of solute×1000
Kf = 7.40×89×1050/1×24.8×1000
Kf = 27.88
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
