Chemical Kineti...

A vessel contains dimethyl ether at a pressure of 0.4 atm. Dimethyl ether decomposes as $$CH_{3}OCH_{3}(g)\rightarrow CH_{4}(g)+CO(g)+H_{2}(g)$$. The rate constant of decomposition is $$4.78\times10^{-3}\:min^{-1}$$. Calculate the ratio to initial rate of diffusion of rate of diffusion after 4.5 hour of initiation of decomposition. Assume the composition of gas present and composition of gas diffusing to be same.

In this case we have
                       $$A\rightarrow  B+C$$
Time              t           $$\infty $$
Total $$press^{r}$$   $$P_2$$        $$P_3$$
Find k?

In a first order reaction, the initial concentrated of the reactant was $$M/10.$$ After $$8$$ minutes $$20$$ seconds the concentrated becomes $$\,M/100.\,$$. What is the rate constant?

After how many second will the concentration of the reactant in a first order reaction be halved if the rate constant is $$1.155 \times {10}^{-3}  {s}^{-1}$$?

Why does the probability curve become narrower when gas particles are more massive?

_________ increases effective collisions without increasing average energy.

Consider the three statements about reaction energy diagrams and the relative magnitudes of the activation energy, $$E_{a}$$, and the enthalpy of reaction, $$\Delta H$$.
One or more of the statements is true.
Identify the correct statement or combination of statements from the four choices below.

Among the following which will decrease the rate of the reaction?
i. Using highly concentrated reactants
ii. Decreasing the temperature by $$25\ K$$
iii. Stirring the reactants

Which of the following choice is correct regarding to increase the rate of a reaction?