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Many computer chips are manufactured from silicon, which occurs in nature as SiO2. When SiO2 is heated to melting, it reacts with solid carbon to form liquid silicon and carbon monoxide gas. In an industrial preparation of silicon, 156.8 kg of SiO2 is allowed to react with 77.5 kg of carbon to produce 66.2 kg of silicon. You may want to reference (Pages 146 - 151) Section 4.3 while completing this problem. Part A Determine the limiting reactant for the reaction. Determine the limiting reactant for the reaction. SiO2(s) C(s)

Respuesta :

Answer:

SiO2 is limiting reactant

Explanation:

SiO2 + 2C ----------> Si + CO

  • molar mass of SiO2 is 60.1 g/mol
  • molar mass of C = 12.01 g/mol
  • mol of SiO2 in 156.8kg = 156.8 x 1000 / 60.1 = 2608.98 mol
  • mol of C in 77.5 kg = 77.5 x 1000 / 12.01 = 6452.95mol

From balanced chemical equation

  • mol of C = 2 x mol of SiO2

  • So for 2608.98 mol of SiO2 you need = 2608.98 x 2 = 5217.96 mol CO2

  • Thus CO2 is present in excess and hence SiO2 is limiting reactant

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