Khyati Posted August 30, 2010 Share Posted August 30, 2010 1)For which of the following reversible reactions Kp may be equal to 0.5 atm and how? a)PCl5 ---------------> PCl3 + Cl2 b)N2 + 3H2 ---------> 2NH3 c)2NO2 ---------------------> N2O4 2)A 1 litre container contains 2 moles of PCl5 initially. If at equilibrium Kc is found to be 1 the degree of dissociation for PCl5 is ? I am getting the answer as 1 but in the book its given as 1/2 Link to comment Share on other sites More sharing options...
mississippichem Posted August 30, 2010 Share Posted August 30, 2010 For number 1: Just use the combined gass law. Which of these reactions results in a reduction in n (number of moles). This problem assumes that the initial pressure is 1 atm, I guess? #2 reactions with K values > 1 are product favored, reaction with K values < 1 are product favored. If K=1 what would that imply? Link to comment Share on other sites More sharing options...
Khyati Posted August 30, 2010 Author Share Posted August 30, 2010 For number 1: Just use the combined gass law. Which of these reactions results in a reduction in n (number of moles). This problem assumes that the initial pressure is 1 atm, I guess? This problem gives only the information that I have written in the question. And the answer given is a)PCl5 ---------------> PCl3 + Cl2, but in this number of moles are increasing so how this can be the correct answer? Its only in option b & c the number of moles are reducing. #2 reactions with K values > 1 are product favored, reaction with K values < 1 are product favored. If K=1 what would that imply? 1)This problem gives only the information that I have written in the question. And the answer given is a)PCl5 ---------------> PCl3 + Cl2, but in this number of moles are increasing so how this can be the correct answer? Its only in option b & c the number of moles are reducing. 2)Got this one Thanks a lot for the help. Link to comment Share on other sites More sharing options...
mississippichem Posted August 30, 2010 Share Posted August 30, 2010 1)This problem gives only the information that I have written in the question. And the answer given is a)PCl5 ---------------> PCl3 + Cl2, but in this number of moles are increasing so how this can be the correct answer? Its only in option b & c the number of moles are reducing. One of these reactions is an equilibrium process, i.e. reversible. The other is not. Link to comment Share on other sites More sharing options...
Khyati Posted August 31, 2010 Author Share Posted August 31, 2010 Okay. Then I think the answer is b)N2 + 3H2 ---------> 2NH3 Thanks Link to comment Share on other sites More sharing options...
cypress Posted August 31, 2010 Share Posted August 31, 2010 1)This problem gives only the information that I have written in the question. And the answer given is a)PCl5 ---------------> PCl3 + Cl2, but in this number of moles are increasing so how this can be the correct answer? Its only in option b & c the number of moles are reducing. Since k = [product1][product2].../[reactant1][reactant2].... what chemical equation will give you units of atm if the concentration units are in partial pressure? this should help you understand which choice is correct. Link to comment Share on other sites More sharing options...
Khyati Posted September 1, 2010 Author Share Posted September 1, 2010 Since k = [product1][product2].../[reactant1][reactant2].... what chemical equation will give you units of atm if the concentration units are in partial pressure? this should help you understand which choice is correct. Ohhhhhhh, thanks a lot Cypress I got it now the answer is a)PCl5 ---------------> PCl3 + Cl2 Link to comment Share on other sites More sharing options...
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