1. Nickel can be obtained from ore containing millerite, Nis, which has density

Question

1. Nickel can be obtained from ore containing millerite, Nis, which has density 555 g/cm, (15 points) nickel can be obtained from 7. 50 cubic feet of millerite? a. How many kilograms solid b. Nickel sulfide, NiS has standard enthalpy of formation HINIS(s)--81.30 krmol of energy (in ku) to needed to remove the nickel metal from 7.50 kg of Ni (note that *TSels)1-0 k/mol ) 8 Nis(s)-. 8 Nils) +Su(s) c. The specific heat of solid nickel is 0.444 /e C"), Determine the final temperature after 75.00 heat is added to 13.0 pounds of nickel initially at-4.00 &H-40.3; kJ 2 Nis(s) + Ni(s) NiSz(s) d. Use data above and: Determine the value of H'lNiSIS)] AND write the thermochemical enthalpy change. equation having

Explanation / Answer

1)

a) mass of NiS = Density*Volume

                 = 5.55*7.5

                 = 41.625 grams

no of mol of NiS = 41.625/90 = 0.46 mol

no of mol of Ni = 0.46 mol

mass of Ni = 0.46 *58 =26.68 grams

b) no of mol of NiS = 7.5*10^3/90 = 83.33 mol

   1 mol NiS = +81.3 Kj

ENERGY NEEDED = 83.33*81.3 = 6774.73 Kj

c) heat supplied(q) = m*s*DT

       q = 75*10^3 jouel

      m = 13 pounds = 5896.7 gram

     S = 0.444 j/g.c

   DT = x - (-4)

75*10^3 = 5896.7*0.444*(x-(-4))

x= final temperature of Ni = 24.65 C

d) DH0rxn = (DH0f,Ni3S2)-(DH0f,Ni + 2*DH0f,NiS)

   -40.3 = (X)-(0+2*81.3)

X = DH0f,Ni3S2 = +122.3 Kj/mol

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