Define reaction rate. Assuming constant temperature and a closed reaction vessel

Question

Define reaction rate. Assuming constant temperature and a closed reaction vessel, why does rate change with time? The reaction A + B rightarrow C + D is second order in A and zeroeth order in B. The value of k is 0.0103 M^-1 min^-1. What is the rate of the reaction when [A] = 0.116 M and [B] = 3.83 M? In the first-order reaction A rightarrow products, [A] = 0.8136 M initially and 0.632 after 16.0 min. a) What is the value of the rate constant, k? b) What is the half-life for this reaction? c) At What time will [A] = 0.235 M? d) What will [A] be after 2.5 h?

Explanation / Answer

Ans 1. Rate of reaction or reaction rate is defined as the change in concentration of reactants or products per unit time value.

It is expressed in terms of rate of decrease of concentration of reactants or rate of increase of concentration of products.

Though reaction occurs at constant temperature in closed vessel , the rate changes with time due to change in concentrations of reactants amd products. The concentrations change with time , and so does the rate.

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