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“We must trust to nothing but facts: These are presented to us by Nature, and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.” ― Antoine Lavoisier, Elements of Chemistry

Tuesday, 24 September 2013

As Level Chemistry-chemical equilibrium

Worksheet A            Equilibrium Calculations
            Solve each problem and show all of your work.
1.         SO3(g)         +     H2O(g)                ⇄    H2SO4(l)        
            At equilibrium [SO3] = 0.400M             [H2O] = 0.480M                  [H2SO4] = 0.600M            
            Calculate the value of the equilibrium constant.
 2.         At equilibrium at 100oC, a 2.0L flask contains:
            0.075 mol of PCl5             0.050 mol of H2O               0.750 mol 0f HCl           0.500 mol of POCl3
            Calculate the Keq for the reaction:
            PCl5 (s) + H2O (g) ⇄ 2HCl (g) + POCl3 (g)
3.         Keq= 798 at 25oC for the reaction:  2SO2 (g)   +  O2 (g) ⇄  2SO3 (g).
            In a particular mixture at equilibrium, [SO2]= 4.20 M and [SO3]=11.0M. Calculate the equilibrium [O2] in this mixture at 25oC.
4.         Consider the following equilibrium:
            2SO2 (g) + O2 (g) ⇄ 2SO3 (g)
            0.600 moles of SO2 and 0.600 moles of O2 are present in a 4.00 L flask at equilibrium at 100oC. If the Keq = 680, calculate the SO3 concentration at 100oC.
5.         Consider the following equilibrium:
            2 NO2(g)           ⇄        N2O4(g)
            2.00 moles of NO2 and1.60 moles of N2O4 are present in a 4.00 L flask at equilibrium at 20oC. Calculate the Keq at 20oC .
6.         2 SO3(g)           ⇄        2 SO2(g)           +          O2(g)
            4.00 moles of SO2 and 5.00 moles O2 are present in a 2.00 L container at 100oC and are at equilibrium. Calculate the equilibrium concentration    of SO3 and the number of moles SO3 present if the Keq = 1.47  x  10-3.
7.         If  at equilibrium [H2] = 0.200M and [I2] = 0.200M and Keq=55.6 at 250oC, calculate the equilibrium concentration of HI.
            H2 (g) + I2 (g) ⇄ 2HI (g)
8.         1.60 moles CO, 1.60 moles H2O, 4.00 moles CO2, 4.00moles H2 are found in a 8.00L container at 690oC at equilibrium.
            CO (g) + H2O (g) ⇄ CO2 (g) + H2 (g)
            Calculate the value of the equilibrium constant.


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