Chemical Kinetics and Nuclear ChemistryHard
Question
For an endothermic reaction, energy of activation is Ea and enthalpy of reaction is ᐃH (both of these in KJ/mol). Minimum value of Ea will be
Options
A.less then ᐃH
B.equal to ᐃH
C.more then ᐃH
D.equal to zero
Solution
In endothermic reactions, energy of reactants is less than that of the products.
Potential energy diagram for endothermic reactions is,
where, Ea = activation energy of backward reaction
E′a = activation energy of backward reaction
ᐃH = enthalpy of the reaction
From the above diagram,
Ea = E′a + ᐃH
Thus, Ea >ᐃH
Potential energy diagram for endothermic reactions is,
where, Ea = activation energy of backward reaction
E′a = activation energy of backward reaction
ᐃH = enthalpy of the reaction
From the above diagram,
Ea = E′a + ᐃH
Thus, Ea >ᐃH
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