CHM1046 EXAM 2 QUESTIONS AND ANSWERS WITH COMPLETE SOLUTIONS 100% CORRECT RATED A+

CHM1046 EXAM 2 QUESTIONS AND
ANSWERS WITH COMPLETE
SOLUTIONS 100% CORRECT RATED
A+
Most of the H2 used in the Harber-Bosch process is produced by steam-reforming
of methane followed by the water-gas shift reaction


CO(g)+H2O(g) -> <- CO2(g)+H2(g)
Kp= 10 at 400 degrees Celsius


Suppose a reaction vessel at 400 degrees Celsius contains a mixture of CO, steam,
and H2 at the concentrations shown in the ICE table shown below:


A. Kp= (Pco2)(PH2)/(Pco)(PH2O)
B. Kp= (Pco)(PH2O)/(PCO2)(PH2)
C. Kp= (PCO2)(PH2)/(PCO)
D. Kp= (PCO2)/(PCO)(PH2O) -ANSWERKp= (Pco2)(PH2)/(Pco)(PH2O)


If you put the above values into the K equation, you end up with a polynomial that
when plugged into the quadratic equations gives you two answers, x=2.96 and
x=1.5. Which of the values would you use to calculate the equilibrium
concentration?


A. 2.96
B. 1.5
C. Neither
D. Both would work -ANSWER1.5

, Ignoring the Kp above but using the same concentrations of the reactants, for
which Kp value below could you confidently ignore x in your calculations?


A. Kp= 1000
B. Kp=10
C. Kp=0.1
D. Kp=0.001 -ANSWERKp=0.001


Which equilibrium reaction below shifts to the product side when the temperature
is increased and to the reactant side when the volume is decreased (pressure
increased) at constant temperature?


A. N2(g) + 3H2(g) -><- 2NH3(g) (DELTA H<0)
B. N2O2 (g) -><- 2NO2(g) (DELTA H>0)
C. H2 (g) + I2(g) -><- 2HI (g) (DELTA H<0)
D. PCL3(g)+Cl2(g)-><- PCl5(g)(DELTAH>0) -ANSWERN2O2 (g) -><- 2NO2(g)
(DELTAH>0)


To the right is the reaction coordinate diagram for the conversion of N2O4 to
2NO2.
What is the first step to the reaction?
A. Can't tell without DELTA H
B. Endothermic
C. Exothermic
D. Neither -ANSWEREndothermic