List of top Chemistry Questions on Theories of reaction rates

At \(300^\circ C\), decomposition of azomethane follows first order kinetics. Rate constant for this reaction at this temperature is \(2.5\times10^{-4}\,s^{-1}\). If the activation energy of the reaction is \(42\,kcal\,mol^{-1}\), what is the temperature (in K) at which the half-life of the reaction is \(138.6\) seconds? \[ (R=2\,cal\,K^{-1}mol^{-1},\; \log20=1.30) \]

Hydrolysis of benzene diazonium chloride follows first order kinetics. The time taken for its decomposition to 1/8 and 1/10 of its original concentration are \([t_{1/8}]\) and \([t_{1/10}]\) respectively. What is the ratio of \([t_{1/8}]\) to \([t_{1/10}]\)? (\(\log 2=0.30\), \(\log 3=0.48\), \(\log 4=0.60\))

When 50 mL of 2M \(N_{2}O_{5}\) was heated, 0.28 L of \(O_{2}\) was formed at STP after 30 minutes. The concentration of unreacted \(N_{2}O_{5}\) is X M and average rate is Y. What are X and Y?

In a reaction 2A $\rightarrow$ product, the concentration of A decreases from 0.5 M to 0.4 M in 10 minutes. The rate of the reaction (in mol $L^{-1} min^{-1}$) is:

The unit of rate constant for a first-order reaction is

75% of a first order reaction was completed in 32 min. 50% of the reaction would have been completed in:

For a reaction \( A + B \to \text{products} \), the rate of the reaction was doubled when the concentration of \( A \) was doubled. When the concentrations of \( A \) and \( B \) were doubled, the rate was again doubled. The order of the reaction with respect to \( A \) and \( B \) are:

What is the concentration (in mol L\(^{-1}\)) of the product after 20 s in the following reaction:
\[ \text{A} \rightarrow 3 \text{B}, \quad \text{rate} = k[\text{A}]^0 \]

If the rate of disappearance of \(\mathrm{N_2O_5}\) in the following reaction is \(1.2\times10^{-5}\ \mathrm{mol\ L^{-1}\ s^{-1}}\), the rate of production of \(\mathrm{NO_2}\) in \(\mathrm{mol\ L^{-1}\ s^{-1}}\) is
\[ 2\mathrm{N_2O_5}(g)\rightarrow 4\mathrm{NO_2}(g)+\mathrm{O_2}(g) \]