[3] At 1000K the eulbrum constant for the reaction: 4Ham) . MnO2o,-ciyo . 2H2on

Question

[3] At 1000K the eulbrum constant for the reaction: 4Ham) . MnO2o,-ciyo . 2H2on * MnO-is K . 164x103 (a) What is AG at 1000 K13 points (b) what is &G; at 1000 K if IHCII “ 3.55 M, [MnO2+0.642 M, PC) . S 66 am, and MnO2(s). 21.74 r,m, (c) At 500 K, the equilibrium constant is K 10.56. What are the signs of AH° and AS7 12p Problem V: [1] Consider the following concentration cell consisting of aluminum electrodes in AlINOs)s solutions (a) Label the anode and cathode and show the direction that electrons will travel on the diagram (2 poina) (b) What will the concentration in both cells be when the concentration cell stops working 12 poi A 1. 0:015 0490 M (c) What initial voltage will be read by the volt meter? (4 points

Explanation / Answer

3) a) DG0 = - RTlnK

           = -8.314*1000ln(1.64*10^3)

           = -61.543 kj

b) DG = DG0 +RTln ([MnCL2]*PcL2 / [HCl]^4)

        = -61543+8.314*1000ln((0.642*5.66/3.55^4)

        = -92.95 kj

c) ln(k2/k1) = DHrxn/R[1/T1 - 1/T2]

     ln((1.64*10^3)/10.56) = (x/8.314)((1/500)-(1/1000))

   DHrxn = 41.947 kj/mol

   DG0 = -RTlnk

       = -8.314*500ln(10.56)

        = -9.8 kj/mol

   DG0 = DH0-TDS0

    -9.8 = 41.947 - (500*x)

x =DS0 = 0.1035 kj/mol.k

   DS0 = 103.5 j/mol.k

Related Questions

Navigate

• Browse (All)
• Browse #
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.