Define activation energy of a reaction.

The least amount of energy required to activate atoms or molecules to a state in which they can undergo a chemicalreaction.It is defined as extra energy to be supplied to the reactants so that they can change into products.
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The rate law for the decomposition of N2O5 is rate = k[N2O5]. What is the significance of k in this equation?


k is equal to the rate of reaction when, [N2O5] = 1 mol of L–1.
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The rate of reaction X → Y becomes 8 times when the concentration of the reactant X is doubled. Write the rate law of the reaction.

Rate of the reaction 

dxdt=xx3.
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State any one condition under which a bimolecular reaction may be kinetically of first order?

During the hydrolysis of 0.01 mol of ethyl acetate with 10 mol of water, amounts of the various constituents at the beginning (t = 0) and completion (t) of the reaction are given as under.


CH3-COOC2H5+HOHCH3-COOH+C2H5-OH
t = 0  0.01 mol 10 mol       0 mol              0 mol
t             0 mol 9.9 mol      0.01 mol    0.01 mol


The concentration of water does not get altered much during the course of the reaction. So, in the rate equation
Rate = k[CH3.COOC2H5]1 H2O0.
the term [H2O] can be taken as constant. The equation, thus, becomes
Rate = k [CH3COOC2H5]
where k = k′ [H2O]
and the reaction behaves as first order reaction

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A reaction is 50% complete in 2 hours and 75% complete in 4 hours. What is the order of the reaction.

It is first order of rection.

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