the chemist uses 11 g of CaF2 and an excess of H2SO4, and the reaction produces 2.2 g of HF calculate the theoretical yield of HF and the percent yield of HF

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Answer is: hydrogen is being oxidized.chemical reaction: co₂ + h₂ → co + h₂o.oxidation half reaction: h₂ → 2h⁺ + 2e⁻.reduction half reaction: c⁺⁴ + 2e⁻ → c⁺².oxidation is increase of oxidation number, hydrogen change oxidation number from neutral charge (in molecule of hydrogen) to oxidation number +1 (in water).