1.

An organic reaction is carried out at 500 K. If the same reaction carried out in the presence of a catalyst at the same rate, the temperature required is 400 K. What is the activation energy of the uncatalysed reaction if catalyst lowers the Ea by 20 kJ/mol?

Answer»

110 kJ/MOL
10 kJ/mol
100 kJ/mol
1000 kJ/mol

Solution :`K_(500)=Ae^((-E_(1))/(RT_(1))),K_(400)=Ae^((-E_(2))/(RT_(2)))`
According to QUESTION, `K_(500)=K_(400)`
`:.""(E_(1))/(RT_(1))=(E_(2))/(RT_(2))""IMPLIES""(E_(2))/(E_(1))=(T_(2))/(T_(1))=(4)/(5)`
Also, `E_(1)=E_(2)+20000" J"`
So, `(E_(1)-20000)/(E_(2))=(4)/(5),""E_(1)=100,000J=100kJ//"mol"`


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