Question

Could someone plz help me with this 4 questions

51. What mass of Co,S, is required Molar Mass /g mof-i to produce 88.0 g of solid cobalt? 2Co2S:(s)+ 3Cu(s) 4Co(s) + 3CuS2(s) (A) 160 g (B) 176g (C) 639 g Co Co2S3 58.93 214.1 (D) 9420 g A reaction mixture initially contains 0.250 mol of Zns and 0.250 mol of O2. After the mixture has reacted completely, how many moles of the excess reactant are left? 52. (A) 0.083 mol ZnS (C) 0.125 mol O2 2ZnS(s) + 302(g) 2Zno(s)+ 2S0-(8) (B) 0.167 mol ZnS (D) 0.250 mol O2 A particular yeast ferments glucose (CsH1u0) and generates CeH20% 180.2 ethanol (C2H OH) with anC2HsOH 46.07 87.0% yield, what mass of glucose is required to produce 475 g of ethanol by this process? 53. Molar Mass g.mol1 C6HnO6(aq) → 2CJHsOH(aq) +2CO2(g) (A) 808 g (C) 1.07x103 g (B) 929 g (D) 2.14x103 g 54. When 5.60 g CaF2 reacted with Molar Mass / g.mol-1 78.07 20.01 excess H2S04, 1.73 g HF was CaF2 obtained. What is the percent HF yield? CaF2 + H2SO42HF+ CaSO4 (A) 60.3% (B) 51.3% (C) 49.3% (D) 30.9%