CHEM 104 1st Edition Lecture 20 Example from previous chemical equilibrium notes butane isobutene kc isobutene butane 2 5 at 298 K If concentration of butane is 0 97 M and concentration of isobutene is 2 18 M is system at equilibrium Q Cisobutane Cbutane 2 18 M 0 97 M 2 25 System is not at equilibrium Q kc reaction will proceed towards the right If you double the volume of a liquid product the concentration of each of the other reactants products will halve since c n v the resulting Q value will depend on the stoichiometry of the equation there could be no shift or equilibrium could shift to the right or to the left Decreasing volume or increasing pressure will shift equilibrium towards a smaller number of particles o Example 2HI g H2 g I2 g If we double pressure all concentrations double Q kc there is no shift in equilibrium o Changing pressure by changing the volume only shifts equilibrium is gaseous systems where change in n isn t equal to 0 Changes in temperature o Endothermic reactions increase in temperature will determine an increase in k c reaction is more product favored at higher temperatures Exothermic reactions increase in temperature will determine a decrease in k c reaction is more reactant favored at higher temperatures These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute
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