Question

4) Industrial silicon used for computer chips is prepared by reacting silicon dioxide with carbon. The other product formed is carbon monoxide. In an industrial scale of preparation of silicon, 50.0 kg of silicon dioxide and 25.0 kg of carbon are reacted to produce 20.0kg of silicon. a) Determine the limiting reactant. SiO2 +30 SIC +20o ) b) Determine the theoretical yield. c) Determine the percent yield. d) Determine the mass in kg of unreacted compound.

Answer 1

Goil molaiman 12 Siq+20 → Si+200 (siq = 60.1 g/mol) moes of S10, a me nos uns = 500002 83195 modus moles of cemaks → 25000 => 208363 moes :) a mole of sio, gives 1 mole of si 831.95 moles of się gives -IX 831195 831.95 moder of si ") 2 moles of Carbon gives I moles of si 2083.3 miles of Carbon gives -> IX 2083.3 1041.65 mees q si a) Siç is the limiting reagent, as it contorets the product formation b) Theoretical yield = moles y molarmais : 831.95 x 28.1 = 23377.89 = 2314 kg wel. Acual yield_ x 100 c) percent yield = Ali pour Theoretical yield" - 20:0x100 2304 = 85.474. d) a mole of sig requires 2 moles of 831.95 moles of sio requires a ex831,95 * 1663,9 modes of moles of carbon unreacted = 2083.3-1663.9 419.64 moes of Carbon mans of unreacted carbon = 419:4812 - 5032.89