Calculate $\Delta \mathrm{T}_{\mathrm{f}}$ of aqueous 0.01 m formic acid if van't Hoff factor is 1.1…

Calculate $\Delta \mathrm{T}_{\mathrm{f}}$ of aqueous 0.01 m formic acid if van't Hoff factor is 1.1 $\left[\mathrm{K}_{\mathrm{f}}=1.86 \mathrm{~K} \mathrm{Kg} \mathrm{mol}^{-1}\right]$
  1. 0.042 K
  2. $\quad 0.020 \mathrm{~K}$
  3. 0.011 K
  4. $\quad 0.033 \mathrm{~K}$

Solution

$\begin{aligned} & \Delta \mathrm{T}_{\mathrm{f}}=\mathrm{i} \mathrm{m} \mathrm{K} \\ & \mathrm{\Delta} \\ & \Delta \mathrm{~T}_{\mathrm{f}}=1.1 \times 0.01 \mathrm{~mol} \mathrm{~kg}^{-1} \times 1.86 \mathrm{~K} \mathrm{Kg} \mathrm{mol}^{-1} \\ &=0.020 \mathrm{~K}\end{aligned}$

Asked in: MHT CET 2024 (04 May Shift 2)

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