Editing revision 8 of Problems On Equilibrium-Revised 2009

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Remember: Need to Write Down First Balanced Chemical Reaction and Equilibrium Constant Expression 
 
1. At 750degC, the following reaction reaches equilibrium in a 1-L container. 
<center>1 H2(g) + 1 <nowiki>CO</nowiki>2(g) <--> 1 H2O(g) + 1 <nowiki>CO</nowiki>(g)</center> 
At equilibrium, the 1-L flask contains 0.053moles hydrogen, 0.053moles carbon dioxide, 0.047moles water, and 0.047moles carbon monoxide. Calculate Keq for this reaction. 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
2.For the reaction , 2 H2S(g) <--> 2 H2(g) + S2(g) 
Keq = 2.3E-4. If the equilibrium concentration of H2S and H2 are 0.15M and 0.010M, what is the equilibrium concentration of S2?

3. The reaction 2 <nowiki>SO</nowiki>2(g) + O2(g) <--> 2 <nowiki>SO</nowiki>3(g) is performed in a 0.50-L container. At equilibrium, 2.00 moles of <nowiki>SO</nowiki>3, 1.75moles of O2 and 3.25moles of <nowiki>SO</nowiki>2 are located in the container . What is the equilibrium constant (K)? (also include the units of K). 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4. The reaction <nowiki>PCl</nowiki>5(g) <---> <nowiki>PCl</nowiki>3(g) + Cl2(g). At equilibrium, a 1.0-L gas vessel has 1.25moles of <nowiki>PCl</nowiki>3, 0.755moles of Cl2 and 2.45moles of <nowiki>PCl</nowiki>5. What is the equilibrium constant? 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Answer: 
1. K = 0.786 , no units 
2. <nowiki>[S</nowiki>2] = 5.18E-2 M 
3. K = 0.108 M-1 
4. K = 0.385 M

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