(Solved): When 252g of iron(III) nitrate (Fe(NO3)3) are dissolved in 800.0g of a certain mystery liqui ...

When $$252\mathrm{g}$$ of iron(III) nitrate $$\left(\mathrm{Fe}\left({\mathrm{NO}}_3\right)3\right)$$ are dissolved in $$800.0\mathrm{g}$$ of a certain mystery liquid $$\mathrm{X}$$, the freezing point of the solution is $$10.5^{?}\mathrm{C}$$ lower than the freezing point of pure $$X$$. Calculate the observed van't $$\mathrm{Hoff}$$ factor for iron(III) nitrate in $$X$$. Freezing point depression constant $$\left(K_f\right)$$ for the mystery liquid $$X=2.8^{?}\mathrm{C}/\mathrm{m}$$ Molar mass of $$\mathrm{Fe}{\left({\mathrm{NO}}_3\right)}_3=241.87\mathrm{g}/\mathrm{mol}$$ $$A1.9$$ $$B2.5$$ $$C2.9$$ Select the phase change of the substance that occurs when the temperature decreases from $$?40^{?}\mathrm{C}$$ to $$?80^{?}\mathrm{C}$$ at $$4\mathrm{atm}$$. Melting, Freezing, Deposition, Vaporization, or Sublimation A B C C D