Mr Lam's Classroom



Percent Yield and Percent Purity WorksheetName:_______________________Date:__________________1. What mass of CuO is required to make 10.0 g of Cu according to the reaction 2NH3+3CuO→N2+3Cu+3H2Oif the reaction has a 58.0% yield2. A student reacts 25.0 mL of benzene (C6H6, density = 0.879g/mL) with a “nitrating mixture” containing excess nitric acid to make 18.0 mL of nitrobenzene (C6H5NO2, density =1.204 g/mL) according to the equationC6H6+HNO3→C6H5NO2+H2OWhat is the percentage yield of the reaction?What mass of C6H6 is left unreacted?3. The reaction SiO2+4HF(g)→SiF4(g)+2H2O(g) produces 2.50 g of H2O when 12.20 g of SiO2 is treated with a small excess of HF.What mass of SiF4 is formed?What mass of SiO2 is left unreacted?What is the percentage yield of the SiF44?4. When 5.000 kg of malachite ore containing 4.30% of malachite, Cu2(OH)2CO3, is heated, the product is copper (II) oxide:Cu2(OH)2CO3→CO2+2CuO+H2OIf the reaction has an 84.0% yield, how many grams of CuO are produced?If the decomposition reaction has an 87.0% yield, what mass of ore containing 3.70% malachite is required to produce 100.0g of CuO?Answer Key: ................
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