23 Limiting reactants 1 - Tamara Hyde | Library

We are going to practice the first step at identifying limiting reactants. That is, finding the theoretical yield of each reactant available. These will be straight stoichiometry problems. Please show work for both reactants.

1. How many moles of water can be made from 4 moles of oxygen gas and 16 moles of hydrogen gas?

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How many moles from hydrogen? Use the balanced equation 2H2 + O2 --> 2H2O

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How many moles form oxygen? Use the balanced equation 2H2 + O2 --> 2H2O

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Which will produce less?

2. Calculate the mass of water produced from the reaction of 24.0 g of H2 and 160.0 g of O2.

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From hydrogen..Use the balanced equation for water production.

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From oxygen..Use the balanced equation for water production.

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Which will produce less?

3.    5L of nitrogen gas reacts with 8L of hydrogen gas to produce ammonia. How many liters of ammonia will be produced?

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From Nitrogen Use the balanced equation N2 + 3H2 --> 2NH3

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From hydrogen Use the balanced equation N2 + 3H2 --> 2NH3

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Which produces less (your limiting reactant)?

4.   If 90.0 grams of sodium is dropped into 40.0 grams of water, what is the theoretical yield of hydrogen gas in grams?

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How much from sodium? Use the balanced equation 2Na + 2H2O --> H2 + 2NaOH

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How much from water? Use the balanced equation 2Na + 2H2O --> H2 + 2NaOH

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Which is used up completely? (your limiting reactant)

5.   What is the yield of copper carbonate in grams if 41.5 grams of copper sulfate react with 37.8 grams of sodium carbonate?

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How much from copper sulfate? Use the balanced equation CuSO4 + Na2CO3 --> CuCO3 + Na2SO4

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How much from sodium bicarbonate? Balance the equation CuSO4 + Na2CO3 --> CuCO3 + Na2SO4

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What is your limiting reactant?

6.   When sodium hydroxide reacts with sulfuric acid, water and sodium sulfate are the products. What is the mass of sodium sulfate that is produced when 12.5 g of sodium hydroxide react with 42.7 g of sulfuric acid?

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Write the balanced equation and to obtain the mole ratio. Leave a space after any coefficients, substances,or plus signs, don't type ones and use the keyboard for yield arrow and subscripts to get immediate feedback on your balanced equation.

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How much will the sodium hydroxide available produce?

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How much will the sulfuric acid available produce?

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Which is the limiting reactant?

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And now, the answer to the orginial question: What is the mass of sodium sulfate that is produced when 12.5 g of sodium hydroxide react with 42.7 g of sulfuric acid?

7.   What is the yield of aluminum hydroxide in grams if 35 grams of aluminum oxide react with 50 grams of water?

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Write the balanced equation and use it for the mole ratio.

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What is the yield of aluminum hydroxide in grams if 35 grams of aluminum oxide is used up?

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What is the yield of aluminum hydroxide in grams if 50 grams of water is used up?

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And now the answer to the original question: What is the yield of aluminum hydroxide in grams if 35 grams of aluminum oxide react with 50 grams of water?