Rates of Reaction
- Consider the reaction of H2 with ethyne to give ethane.
2 H2 + C2H2 → C2H6
Determine the rate law and rate constant for the reaction from the following data:
initial concentration of H2 initial concentration of ethyne rate of formation of ethane 0.10 M 0.10 M 1.0 x 10-4 M/min 0.20 M 0.10 M 2.0 x 10-4 M/min 0.10 M 0.20 M 1.0 x 10-4 M/min
- Carefully explain the difference between the reaction of methyl iodide and t-butyl chloride with hydroxide ion. Give the rate law for each, a mechanism, and a reaction profile.
- For the reaction:
N2O4 → 2 NO2
the following data were collected:
N2O4 at start amount of NO2 after 1 min 1.0 M 0.6 M 0.5 M 0.3 M 0.25 M 0.15 M
- Give the rate law for this reaction.
- Calculate the rate constant.
- When the reaction is started with 1.0 mole of N2O4 in a 1.0 L flask, how much N2O4 remains after 1 min?
- Calculate ΔH for this reaction.
- Postulate a mechanism for this reaction.
- Give a reaction profile for this mechanism and clearly label all parts of the profile.
- N2O4 has the following structural formula:
where the nitrogens are attached to each other and the oxygens are attached only to a nitrogen. Write an electron-dot formula for this molecule and put in the formal charges.
- Is the electron-dot formula for N2O4 in g. above helpful in explaining your mechanism? Explain.
- Draw a picture showing the relative positions of all of the atoms in the transition state (if there are more than one in your mechanism, show each one).