How many kilo grams solid nickel can\'t be obtained from 7.50 cubic feet of mill

Question

How many kilo grams solid nickel can't be obtained from 7.50 cubic feet of millerite ? 1. Nickel can be obtained from ore containing millerite, NIS, which has density 5.55 e/em2 (15 points a. How many kilograms solid nickel can be obtained from 7.50 cubic feet of millerite? b. Nickel sulfide, Nis, has standard enthalpy of formation ."[NiS(s)--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) +58(s) ( note that ,"[Sa(s))-Oki/mol )

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

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