27) Chromium metal can be produced by the reacting chromium (III) oxide with silicon by the following unbalanced equation: Cr2O3+SiCr+SiO2 a) What is the percent yield of Cr if 125g of silicon produced 314g of Cr ? b) If instead it reacts to produce 286g of Cr, what is the percent yield? 28) Answer the following for the reaction: Pb(NO3)2(aq)+2KCl(aq)PbCl2(9)+2KNO3(aq) a) How many grams of PbCl2 will be produced from 50.0mL of a 1.50MKCl solution? c) What is the molarity of 20.0mL of a KCl solution that reacts completely with 30.0mL of a 0.400MPb(NO3)2 solution? 29) Lab Example - If 38.2mL of a 0.163MKOH solution is used to titrate 25.0mL of of an H2SO4 solution, what is the molarity of the H2SO4 solution? H2SO4(aq)+2KOH(aq)2H2O(i)+K2SO4(aq) 30) Phosphorus trichloride, PCl3, is made by the combination of phosphorus and chlorine, as shown by the following unbalanced equation: P4(0)+Cl2(0)PCl3(1) a) If 125gP4 react with 323gCl2, what is the limiting reactant and theoretical yield of PCl3