1. Tardigrade
  2. Question
  3. Chemistry
  4. If at 298K the bond energies of C-H,C-C,C=C and H-H bonds are respectively 414,347,615 and 435kJ/mol . The value of enthalpy change for the reaction (CH)2=(CH)2 (. g .)+H2(g) arrow (CH)3-(CH)3 (. g .) at 298K will be :

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Q. If at $298K$ the bond energies of $C-H,C-C,C=C$ and $H-H$ bonds are respectively $414,347,615$ and $435kJ/mol$ . The value of enthalpy change for the reaction $\left(CH\right)_{2}=\left(CH\right)_{2 \left(\right. g \left.\right)}+H_{2}\left(g\right) \rightarrow \left(CH\right)_{3}-\left(CH\right)_{3 \left(\right. g \left.\right)}$ at $298K$ will be :

NTA AbhyasNTA Abhyas 2020

Solution:

$ΔH_{R}=H_{R}-H_{P}$
$ΔH_{R}=4\times 414+615+435-\left[\right.6\times 414+347\left]\right.$
$ΔH_{R}=-125kJ$