Does rate of a reaction change if reaction equation is multiplied by a number and if it does change then why?
2016-06-22 8:07 am
Suppose there is a reaction A---->B which has a reaction constant k. If this reaction is multiplied by 2, then 2A---->2B and the new constant becomes k^2. Change in k means that rate of reaction has been changed. But since the contents of the reaction are still the same (it doesn t really change anything if an equation has been mutiplied by a number, or correcr me if i am wrong) then how does the rate change?
回答 (3)
2016-06-22 8:32 am
The rate of a reaction does NOT change when the reaction equation is multiplied by a number.
The coefficients of a chemical equation only show the mole ratio of reactants and products, but give no information on the reaction rate.
Now, consider the two equations : A → B and 2A → 2B
Both equations show that x moles of B is produced when x moles of A is produced. Neither of them gives information on the reaction rate.
The coefficients of a chemical equation only show the mole ratio of reactants and products, but give no information on the reaction rate.
Now, consider the two equations : A → B and 2A → 2B
Both equations show that x moles of B is produced when x moles of A is produced. Neither of them gives information on the reaction rate.
2016-06-22 2:58 pm
the answer is NO.
********
for the reaction
.. A + B ---> C + D
rate = k x [A]^m x [B]^n
... ... = Ao exp(-Ea / RT) x [A]^n x [B]^m
none of those variables
.. Ao, Ea, R, T, [A], [B], n, m
depend on the COEFFICIENTS of the balanced equation!
********
for the reaction
.. A + B ---> C + D
rate = k x [A]^m x [B]^n
... ... = Ao exp(-Ea / RT) x [A]^n x [B]^m
none of those variables
.. Ao, Ea, R, T, [A], [B], n, m
depend on the COEFFICIENTS of the balanced equation!
2016-06-22 10:59 am
The rate of reaction does not change if reaction equation is multiplied by a number since multiplying by any number brings number of participated by reactants and products in the chemical reaction equation but does not make any change in the concentration of reactants , actually the rate of reaction is a matter of concentration and not participation of reactants / products in rate reaction by number of moles .
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