Question

Practice: Many computer chips are manufactured from silicon, which occurs in nature as SiO, When SiO, is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 155.8 kg of SiO2 reacts with 78.3 kg of carbon to produce 66.1 kg of silicon. Write a balanced reaction for the process, determine the limiting reactant, theoretical yield, and percent yield. How much (grams) carbon monoxide is released?

Answer 1

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ISS-6 Kg SiO2,5 + 2C (s) Sicus +200 g) 1 mol amol 1 mol amot Sio - mass = 155,8kg molar mass = 60.08 g/mol no. of moles = mass (g . molar mars (g/md) * 60.08 mmol = 2.5qual k mol - Carbon : mass = 78.3kg & Molar mass = 12.0g/mol no. of moles = 78.3 kg = 6.595kmol As per the equation 1 mol sio reacts with 2 mol Carbon lograd) So, 2.59 kmol so reacts with 5.18 kmol carbon. But, there is 6.525 kmol Carbon, which us in excess, in SiO₂ is dimiting deactant (which will be consumed Completely) # Now 1 mol sio, reacts to produce 1 mol silicon (lil mod ratio) u. 2.59 km of Sio₂ reacts to produce 2.59 kmol silicon Mass of silicon = no of moles & molar mass = 2.59kmol x 28. og/mol = 42.5kg of silicon will be expect to produce But produced 66.1 kg of silicon practically. (practical yield) Theoretical yield = mass of practical Mass of Theoretical x oo = 66.1kg x 100 = 91.14% 12.52 kg # 1 mol sio reacts to produce a mol co 2 2.59 kmol x2 mol sio So, 2.59 Kmo reacts to produe – mot co s Ind = 5.18 km Mass of co & no. of moles & molar mass - 5. 18kmolx 28 g/mol - 145.04 kg