When will a reaction occur at room temp?

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When will a reaction occur at room temp?

Postby 204635822 » Thu Mar 03, 2016 11:19 am

In the intro to ochem book, on pg 154, it says that a rxn will occur at room temp if Ea>80kj/mol and wont occur at room temp is Ea<80kj/mol. In the graphs, however, it does not always state numbers for Ea, so how do we know when a reaction occurs at room temp?

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Re: When will a reaction occur at room temp?

Postby Chem_Mod » Thu Mar 03, 2016 12:21 pm

So you have reversed what is said in the book, if Ea is less than 80 kJ/mol it can occur at room temp, while above that, energy input is required. This just means that room temp is enough energy for the reaction to be spontaneous. You can imagine for the case in which Ea is over 80 kJ/mol, you need to input energy to cause a reaction, similar to increasing temp to make delta G negative using the Gibbs free energy equation.

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