{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

IMG_0005_NEW_0001

# IMG_0005_NEW_0001 - cC dD Equilibrium constants for gases...

This preview shows page 1. Sign up to view the full content.

Equilibrium Expressions For Gases To describe equilibria involving gases usually use partial pressures instead of concentrations Partial pressure : independent pressure exerted by each gas in a mixture Equilibrium expression for gases: *o + bP" =- cPc + dPD Equilibrium constant for partial pressures (rKr): u -(P.)"(Po)o ^r - 1polpY . Total pressure = sum ofthe partial pressures Pro,a: P^ + PB + Pc t Po . Units of prressure: S.I. Unit: Pascal (Pa) orAtrnospheres (atm), I atrn: 101.325 kPa Equilibrium Constants and Activities . Equilibrium constants = thermodynamic quantities > Instead of Concentration and Pressure Use Activities . Activity: effective concentration or partial pressure of a species . - Actirrity + Ratio of P or Conc. toBgfe,rcnce . Gas: Actitzity(c orrponent i) = a, . Solution: Actirzity(c onporrcnt Relationship between K and Kp . To describe equilibria involving gases can use: - Partial Pressures: *o + bP" : cP. + dPo OR- Concentrations: aA + bB
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: cC + dD . Equilibrium constants for gases . Ideal gas law + Pressure ++ Conc. relationship a K(RZlcextu:;ffi\$ K" *(RZ)eXe:sI=T1& An: (sum of coefficients of gaseous products)- (sum of coefficients of gaseous reactants) lAl"[B]o Equilibrium Constants and Activities O Equilibrium constant in terms of activities: Fromconcentrations: aA + fS: cC + dD frcr(M))'fpr(M)\' "-(a.)"(ao)d -1. rM J l. lM ./ -tcl"tpl' '- 1ao)'(a")b rtAl(M))"rFl(M)'.\' tAr[BJ' I rM .il rM ./ ( r.1arq ')"( rolarn; )' I r"o" J t l"t"r ,, = ( r^1ar4 )"( r"1arn; '\h l. I "rr .J l. t.t" l Frompartialpressures: *o + bP" =- cP. * dPo n _la.)"(ao)d _ ^" - t"^tltoJ -€) Pure solids and liquids _ [pure so[d] [pwe sohd] aPurcrcrid: tR"€r"*"f = [o*" *0, =' lpre huill [pure huil] to*"ou,o=;p"6,g;e] = [r.'* lio*, =' For pure solids and liquids, the reference state is the pure solid or liquid Activity of pure solid and liquids always: I 8...
View Full Document

{[ snackBarMessage ]}

### What students are saying

• As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

Kiran Temple University Fox School of Business ‘17, Course Hero Intern

• I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

Dana University of Pennsylvania ‘17, Course Hero Intern

• The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

Jill Tulane University ‘16, Course Hero Intern