Express the rate of reaction in terms of concentration of reactants and products for the reaction.
2N2O5(g)  4 NO2(g) + O2(g)

Rate of reaction in terms of concentration of reactant and product can be express as.

-12dN2O5dt=+14=dNO2dt=+dO2dt
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If the concentration is expressed in mol per litre and time in minutes, then write the units for the rate constant for n-th order reaction.

The units of rate constant for the nth order reaction equal to (mol L–1)1 – n min–1.

 

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Express the relationship between the rate of production of water and the rate of disappearance of oxygen in the following reaction:
C2H6(g)+72O2(g)   2CO2(g)+3H2O(l)


The relationship between the rate of production of water and the rate of disappearance of oxygen can be express as:

Rate = +13dH2Odt=-27dO2dt
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Why is it that the instantaneous rate of reaction does not change when a part of the reacting solution is taken out?

Instantaneous rate of reaction is change in concentration for a very small interval of time represented by dxdt which remains almost constant even if part of solution is taken out.
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For the hypothetical reaction:
A2+2B2  2AB2,
write the rate equation in terms of the disappearance of B2 and formation of AB2.

Rate = -12dB2dt=+12dAB2dt

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