Answer to Question #195562 in General Chemistry for Mthandeni Ntshilib

Question #195562

Calcium carbide, CaC2, is an important preliminary chemical for industries producing synthetic fabrics and plastics. CaC2 may be produced by heating calcium oxide with coke: CaO + 3C → CaC2 + CO.

In a reaction, 1.5kg of carbon was reacted with calcium oxide and calcium carbide was produced. calculate the percent yield of calcium carbide.

Expert's answer

Moles of Carbon = 1500g/12g = 125 mol

When 3 mole of C react with 1 mole of CaO

Moles of CaO = 125mol/3 = 41.66 mol

Mass of CaO = 41.66 × 56.077 = 2336.16 = Actual yield

Similarly moles of CaC2 = 41.66 mol

Mass of CaC2 = 41.66 × 64.099 = 2670.36 g = theoretical yield

Percentage yield = "\\frac{Actual yield}{theoretical yield} \u00d7100"

Percentage yield = "\\frac{2336.16}{2670.36} \u00d7100" = 87.4%

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