Decomposition Of Cyclobutane Essay
The reaction rate can be studied by measuring the time taken for sufficient quantity of yellow sulfur to be formed. Over time, a ‘’cross’’ marked on a piece of paper under the conical flask gradually disappears when viewed from above. 1 time taken for the ‘’cross’’ to disappear because the amount of sulfur formed is considered fixed.
To study the order of reaction, the experiment is repeated by varying the concentration of each of the reactants (Na2S2O3 and HCl) in turn, keeping the other constant. Start the timer the moment the last reactant is introduced into the conical flask. run vol of Na2S2O3 vol of HCl (cm3) vol of …show more content…
A plot of against gives a straight line.
Example 4
The Arrhenius parameters which define the Arrhenius equation for the decomposition of cyclobutane are In (A/s-1) = 15.6 and Ea = 261 kJ mol-1. Determine the half-life of cyclobutane at the temperature of 773 K. C4H8 (g) 2 C2H4 (g)
The decomposition of cyclobutane follows first order kinetics as the unit of A is s-1. Comment: The units for A provide information on the reaction’s overall order of kinetics.
Substitute the values of In A = 15.6 and Ea = 261 x 103 into the Arrhenius equation. k = 3.595 x 10-17 s-1 half-life = ln2/k = 1.93 x 1016 s (3sf)
Example 5
Radioactive decay follows first order kinetics. The amount of radioactivity recorded from an isotope decreased from 2720 counts to 85 counts in 45 hrs. Determine the time required for the radioactivity of the same isotope to drop from 2400 counts to 300 counts?
To study the order of reaction, the experiment is repeated by varying the concentration of each of the reactants (Na2S2O3 and HCl) in turn, keeping the other constant. Start the timer the moment the last reactant is introduced into the conical flask. run vol of Na2S2O3 vol of HCl (cm3) vol of …show more content…
A plot of against gives a straight line.
Example 4
The Arrhenius parameters which define the Arrhenius equation for the decomposition of cyclobutane are In (A/s-1) = 15.6 and Ea = 261 kJ mol-1. Determine the half-life of cyclobutane at the temperature of 773 K. C4H8 (g) 2 C2H4 (g)
The decomposition of cyclobutane follows first order kinetics as the unit of A is s-1. Comment: The units for A provide information on the reaction’s overall order of kinetics.
Substitute the values of In A = 15.6 and Ea = 261 x 103 into the Arrhenius equation. k = 3.595 x 10-17 s-1 half-life = ln2/k = 1.93 x 1016 s (3sf)
Example 5
Radioactive decay follows first order kinetics. The amount of radioactivity recorded from an isotope decreased from 2720 counts to 85 counts in 45 hrs. Determine the time required for the radioactivity of the same isotope to drop from 2400 counts to 300 counts?