1. Tardigrade
  2. Question
  3. Chemistry
  4. The two liquids CH 3 COOCH 3 and CHCl 3 combine in such a way that they form a single H-bond between each pair of molecules. In an experiment to determine the approximate strength of this bond, samples of the two liquids were mixed in an insulated glass beaker and the temperature was found to rise by 1° C. Other data are given in the table below mass(g) Amt. in moles sp. heat J/gm-K CH3COOCH3 3.71 0.05 2.0 CHCl3 1.195 0.01 1.0 Beaker 66 - 0.5 The approximate strength of the H-bond according to the above experiment (in kJ / mole ) will be

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Q. The two liquids $CH _{3} COOCH _{3}$ and $CHCl _{3}$ combine in such a way that they form a single $H$-bond between each pair of molecules. In an experiment to determine the approximate strength of this bond, samples of the two liquids were mixed in an insulated glass beaker and the temperature was found to rise by $1^{\circ} C$. Other data are given in the table below
mass(g) Amt. in moles sp. heat J/gm-K
$CH_3COOCH_3$ $3.71$ $0.05$ $2.0$
$CHCl_3$ $1.195$ $0.01$ $1.0$
Beaker 66 - 0.5

The approximate strength of the $H$-bond according to the above experiment (in $kJ / mole$ ) will be

Thermodynamics

Solution:

$\Delta H =0.742 \times 2 \times 1+1.195 \times 1 \times 1+66 \times 0.5 \times 1$
$\approx 36 \,J$ from $0.01\, mole\, CHCl _{3}$
$\therefore H _{ BE }=3.6 \,kJ \,mol ^{-1}$