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Answer 1 · 2016-07-24T18:42:54

Let
$E_{R} \to Average Energy of Reactants$ $E_R->"Average Energy of Reactants"$

$E_{P} \to Average Energy of Products$ $E_P->"Average Energy of Products"$

$E_{T} \to Energy of Transition State$ $E_T->" Energy of Transition State"$

$E_{Af} \to Activatiom Energy of Forward Reaction$ $E_"Af"->"Activatiom Energy of Forward Reaction"$

$E_{Ab} \to Activatiom Energy of Backward Reaction$ $E_"Ab"->"Activatiom Energy of Backward Reaction"$

$E_{Af} = E_{T} - E_{R}$ $E_"Af"=E_T-E_R$

$E_{Ab} = E_{T} - E_{P}$ $E_"Ab"=E_T-E_P$

$Enthalpy change of reaction$ $"Enthalpy change of reaction"$
$DeltaH=E_P-E_R=(E_T-E_R)-(E_T-E_p)$

$=E_"Af"-E_"Ab"=(150-250)kJ=-100kJ$

$DeltaH$ of reaction being negative the reaction is endothermic.