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The concentration characterizes the composition of a mixture with respect to the volume of the mixture. There are mass, amount, number and volume concentrations. Related and within the scope of this tag are normality, molality, mole fraction/ratio, mass fraction/ratio.
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Dependence of rate on the nature of reactants and other factors
Does the rate equation account for all the factors (I could find that by changing these factors the change in concentration for a time interval would vary)? … If in a lab we are given different samples of reactants and measure the rate of the reaction (but same concentration), wouldn't each get a different rate value? How is the rate uniquely defined? …
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Units of Activation Energy
Since the reaction is the same the amount of energy needed should be constant to react a fixed concentration of reactants. I know I am missing some understanding here. …