# Limiting Reactant and Percent Yield

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The chemical equation shows iron(III) phosphate reacting with sodium sulfate. 2FePO4 + 3Na2SO4 –>Fe2(SO4)3 + 2Na3PO4 What is the theoretical yield of Fe2(SO4)3 if 20.00 g of FePO4 reacts with an excess of Na2SO4?

26.52 g
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Salicylic acid (C7H6O3) reacts with acetic anhydride (c4h6o3-structure/”>c4h6o3) to form acetylsalicylic acid (C9H8O4). 2C7H6O3(aq) + C4H6O3(aq)–> 2C9H8O4(aq) + H2O(l) What is the limiting reactant if 70.0 g of C7H6O3 and 80.0 g of C4H6O3 react?

salicylic acid
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Consider the balanced equation. N2 + 3H2 –>2NH3 What is the percent yield of NH3 if the reaction of 26.3 g of H2 produces 79.0 g of NH3?

53.4%
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Consider the combustion reaction for acetylene. 2C2H2(l) + 5O2(g) –> 4CO2(g) + 2H2O(g) If the acetylene tank contains 37.0 mol of C2H2 and the oxygen tank contains 81.0 mol of O2, what is the limiting reactant for this reaction?

O2
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The formula is used to calculate the percent yield of a reaction.

(actual yield/theoretical yield)x100%
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What is used up first and stops a chemical reaction?

limiting reactant
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Consider the balanced equation. 2HCl + Mg –>MgCl2 + H2 If 40.0 g of HCl react with an excess of magnesium metal, what is the theoretical yield of hydrogen?

1.11 g
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The electrolysis of water forms H2 and O2. 2H2O –> 2H2 + O2 What is the percent yield of O2 if 10.2 g of O2 is produced from the decomposition of 17.0 g of H2O?

67.6%
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A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation. What is the theoretical yield of carbon dioxide?

8.93 g
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Ammonia is produced by the following reaction. 3H2(g) + N2(g) –>2NH3(g) When 7.00 g of hydrogen react with 70.0 g of nitrogen, hydrogen is considered the limiting reactant because_____

7.5 mol of hydrogen would be needed to consume the available nitrogen.
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Consider the chemical equation. CuCl2 + 2NaNO3 –>Cu(NO3)2 + 2NaCl What is the percent yield of NaCl if 31.0 g of CuCl2 reacts with excess NaNO3 to produce 21.2 g of NaCl?

78.7%
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Consider the balanced equation. CuSO4 + Zn –>ZnSO4 + Cu If 200.0 g of copper(II) sulfate react with an excess of zinc metal, what is the theoretical yield of copper?