2/25 HW – Limiting Reactants and Percent Yield
1. A process by which zirconium metal can be produced from the mineral zirconium (IV) orthosilicate, ZrSiO4, starts by reacting it with chlorine gas to form zirconium (IV) chloride, silicon dioxide, and oxygen gas. What mass of zirconium (IV) chloride can be produced if 862 g of ZrSiO4 and 950. g of chlorine gas are available? You must first determine the limiting reactant.
2. In the production of copper from ore containing copper (II) sulfide, the ore is first roasted (burned) to change it to the oxide. What mass of CuO can be formed from the reaction of 18.7 g of CuS and 12.0 g of oxygen?
3. A reaction such as the one shown here is often used to demonstrate a single replacement reaction:
CuSO4 + Fe à Cu + Fe2(SO4)3
If you place 0.092 mol of iron filings in a solution containing 0.158 mol of CuSO4, what is the limiting reactant? How many moles of Cu will be formed?
4. In the reaction, BaCO3 + 2 HNO3 à Ba(NO3)2 + CO2 + H2O, what mass of barium nitrate can be formed by combining 55 g of BaCO3 and 26 g HNO3?
5. Bromine replaced iodine in magnesium iodide.
a. Which is the excess reactant when 560. g of MgI2 and 360. g of Br2 react, and what mass remains?
b. What mass of I2 is formed in the same process?
6. The following reaction took place:
Ca3(PO4)2 + SiO2 + C à CaSiO3 + P + CO
a. Balance the equation
b. Determine the percent yield if 15360 g of carbon is consumed and 622 mol of CaSiO3 is produced.
c. The engineer in charge of this process expects a yield of 81.5%. If 1.4 X 105 mol of calcium phosphate is used, how many moles of phosphorus will be produced?
7. Acrylonitrile, C3H3N, is an important ingredient in the production of various fibers and plastics. Acrylonitrile is produced from the following reaction.
C3H6 + NH3 + O2 à C3H3N + H2O
If 850. g of C3H6 is mixed with 300. g of NH3 and unlimited O2, to produce 412 g of acrylonitrile, what is the percent yield? You must first balance the equation.