Question

The reaction of Cr2O3 with silicon metal at high temperatures will make chromium metal. 2Cr,0,(s) + 3Si(s) — 4Cr(I) +3510,(s) The reaction is begun with 83.00 g of Si and 117.00 g of Cr2O3. 3rd attempt Part 1 (1 point) l See

Answer 1

No of moles of Cra Oz = Mass 83.00g Molar Mass No of moles of CreO₂ = Mass = Molar mass 117.00 g = 0.769786 T51.9gogglmal - mol No of moles of Si = 83.00g = 2.95526 mol - 28.0855g 1mal 261, O₂ + 3 si 4 61 + 3502 2 male Cory Og requires 3 male si to react completely • 0.769786 mol (My lz should require 3x0.769786 = 1. 154679 mole si. As no. of males of Si available care - more hence Si is the Excess Reagent o. No of males of Si Reacted = 1. 154679 mole. 7 No of holes of Si left = Total No. of moles of Si) (No of - moles of si Reacted) = 2.95526 mol - 1.154679 mal : = 4.80058 mol Grams of Excess Reagent left = No of males & Malwr May (Si) "=1.80058 mal x 28.0855 glmal = 50.57g