How to find rate of reaction if rate constant is given ?
Answers
Answer:
You will remember that the rate equation for a reaction between two substances A and B looks like this:
check the attachment
The rate equation shows the effect of changing the cloncentrations of the reactants on the rate of the reaction. What about all the other things (like temperature and catalysts, for example) which also change rates of reaction? Where do these fit into this equation?
These are all included in the so-called rate constant - which is only actually constant if all you are changing is the concentration of the reactants. If you change the temperature or the catalyst, for example, the rate constant changes.
Various symbols...
Temperature, T
To fit into the equation, this has to be meaured in kelvin.
The gas constant, R
This is a constant which comes from an equation, pV=nRT, which relates the pressure, volume and temperature of a particular number of moles of gas. It turns up in all sorts of unlikely places!
Activation energy, EA
This is the minimum energy needed for the reaction to occur. To fit this into the equation, it has to be expressed in joules per mole - not in kJ mol-1.
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