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A reaction takes place in three steps wi...

A reaction takes place in three steps will activation energy `Ea_1 = 180` kJ/mol`, Ea_2 = 80 `kJ/mol` & Ea_3 = `50kJ/mol`` respectively.Overall rate constant of the reaction is `k = [(k_1k_2)/k_3]^(2/3)`
Calculate activation energy of the reaction.

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140 kJ/mol
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