Question

. For the ammonia synthesis reaction, N2+3H2→2NH3, if the rate of reaction with respect to N2 is -r_N2, what is the rate (in terms of -r_N2) with respect to

a). H₂

b.) NH₃

Answer 1

Consider a standard example,

rate of the reaction with respect to reactant A is -r_A.

negative sign indicates that as time progresses concentration decreases. For reactant there will be negative sign and for products sign be positive as it's concentration increases with time.

Thus,

(positive sign need not be shown always, it is understood)

The relation between the rate of all the species is

Here in this reaction N₂ and H₂ are reactants and NH₃ is product.

Thus the reaction rate in terms of H₂ and NH₃ can be obtained as,

(a) Rate of reaction with respect to H₂ is, .

From the above expression,

(b) Rate of reaction with respect to NH₃ is,

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