b. Nickel sulfide, NIS, has standard enthalpy of formation &H;//NS(3))--81.30 kJ

Question

b. Nickel sulfide, NIS, has standard enthalpy of formation &H;//NS(3))--81.30 kJ/mol Determine the amount of energy (in k) to needed to remove the nickel metal from 7.50 kg of NiS. 8 Nis(s)-. 8 Ni(s) +Sls) note that"[S(s)]s 0 k /mol ) c. The specific heat of solid nickel is 0.444 /s C]. Determine the final temperature after 75.00 kJ of heat is added to 13.0 pounds of nickel initially at-4.00 "C. d. Use data above and: 2 Nis(s) + Ni(s) Ni,sds) 1-40.3 kJ Determine the value of AH,"[NiS1s] AN enthalpy change D write the thermochemical equation having that

Explanation / Answer

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 joulE

      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 = -202.9 Kj/mol

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