Nickel(II) sulfide, NiS, occurs naturally as the relatively
rare mineral millerite. One of its occurrences is in meteorites.
… a 0.468-g sample containing millerite produces 0.206 g of red,
solid …

Show transcribed image text 29. Nickel (II) sulfide, NiS, occurs naturally as the relatively rare mineral millerite. One of its occurrences is in mete- orites. To analyze a mineral sample for the quantity of NiS, the sample is dissolved in nitric acid to form a solution of Ni(NO3)2 Nis(s) + 4 HNO3(aq) → Ni(NO32(aq) + 2 NO2(g) +2 H2o(e) + S(s) The aqueous solution of Ni(NO3)2 is then reacted with the organic compound dimethylglyoxime (C4HsN2O2) to give the red solid Ni(C4H,N202)2 Ni(NO3)2(aq) +2 C4H4N2O2(aq) → Ni(C4H N202)2(s) + 2 HNOs(aq) Suppose a 0.468-g sample containing millerite produces 0.206 g of red, solid Ni(C4H/N2O2)2. What is the mass ercent of NiS in the sample?