CHEM107 EXAM-2 STUDY GUIDE UNITS-9 through 16 Benzene, Cals, and toluene, Cah.CH

Question

CHEM107 EXAM-2 STUDY GUIDE UNITS-9 through 16 Benzene, Cals, and toluene, Cah.CH, form ideal solutioeperimet, 3.8 mp of benzene is 1 benzene an and that of toluene is 50.0 torr. In an experiment, 3.8 mol of to m. What is the mole fraction of toluene in the vapor phase? 0.60 mol of toluene are placed in a closed container at 35°C and allowed to come- to A)-0,30) B) A) th uilibrium C) 0.70 D)0.52 E) 0.14 2. A red blood cell placed in pure water will swell bec e osmotic pressure is greater in the cell than in the water. ause Vapor pressure of the water in the cell is greater than the vapor pressure of pure water C) the osmotic pressure is greater in the water than in the cell. the osmotic pressure is the same in the cell and the water. water moves from a higher osmotic pressure to a lower osmotic pressure. 3. The potential-energy diagram below describes the hypothetical reaction A B C+ D. Potential A B Energy C+ D Reaction Coordinate Which of the following statements is correct? A) The forward reaction is endothermic. B) The activation energy for the forward reaction is greater than that for the reverse reaction. C) The effect of a temperature change is greater for the reverse reaction than for the D) E) forward reaction. The activation energy for the reverse reaction is less than zero. A and B are lower in energy than C and D. 4. For a certain second-order decomposition reaction, the rate is 0.50 mol/(L s) when concentration of the reactant is 0.24 mol/L. What is the rate constant for this reactio D) 2.08 L/(mol s)

Explanation / Answer

(A): The forward reaction is not endothermic. It is an exothermic reaction because the product has low potential energy. We can alsounderstand it by writing the formula for Delta H = Hproduct - Hreactant .

Here we knoe Hproduct < Hreactant   So Delta H will be negative so forward reaction is exothermic.

(B): No,  Activation energy is the energy required to reach at the top of the potential energy curve. From graph we can see from forward side the hight of the peak is lower than the hight of peak from backward side. So the Activation energy of backward reaction is greater than the Activation energy of forward reaction.

(C): Yes, in case of reverse reaction if temprature is raised then thn activation energy of backward reaction will be obtaind by C & D. So temprature icrement will favour the backward reaction.

And in case of forward reaction it is already an exothermic reaction so temprature raise will not favour the forward reaction. reverse reaction will start.

(D): NO (It is not zero . it is some positive value.)

(E): NO, A & B are higher in energy than the energy of C & D . We can see it from graph. A & B are above the energy level of C & D

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