1. Tardigrade
  2. Question
  3. Chemistry
  4. Enthalpies of formation of CCl 4( g ), H 2 O ( g ), CO 2( g ) and HCl ( g ) are -105,-242,-394 and -92 kJ mol -1 respectively. The magnitude of enthalpy of the reaction given below is kJ mol -1 . (nearest integer) CCl 4( g )+2 H 2 O ( g ) arrow CO 2( g )+4 HCl ( g )

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Q. Enthalpies of formation of $CCl _4( g ), H _2 O ( g ), CO _2( g )$ and $HCl ( g )$ are $-105,-242,-394$ and $-92\, kJ$ mol $^{-1}$ respectively. The magnitude of enthalpy of the reaction given below is ___$kJ \, mol ^{-1}$ . (nearest integer)
$CCl _4( g )+2 H _2 O ( g ) \rightarrow CO _2( g )+4 HCl ( g )$

JEE MainJEE Main 2023Thermodynamics

Solution:

$ \Delta_{ r } H =\sum H _{ p }-\sum H _{ R } $
$ =(-394+4 \times-92)-(-105+(2 \times-242)) $
$ =-173 \,kJ / mol $