(del) Open Source CA Textbook - Chemistry

OLD Unit 4: Gases and Their Properties

Unit 3: Conservation of Matter & Stoichiometry

Limiting Reactant

  • limiting reactant controls the amount of product that is formed in a chemical reaction
  • How do you calculate limiting reactant?
1) If necessary, convert reactants A & B to moles
2) Using the # of moles given for A, calculate how many moles of B would be needed to react.
3) Using the # of moles given for B, calculate how many moles of A would be needed to react.
4) Which reactant will you run out of first (the one where your NEED

exceeds what you are GIVEN)? This is your limiting reactant.

SiO2(s) + 4HF(g) ? SiF4(g) + 2H2O(l)

If 2.0 mol of HF is combined with 4.5 mol SiO2, which is the limiting reactant?

N2H4(l) + 2H2O2(l) ? N2(g) + 4H2O(g) (propellants used in some rockets)

What is the limiting reactant when 24.0 g of N2H4 reacts with 17.0 g of H2O2?
How many grams of excess reactant remain?
How many grams of water vapor are produced?

  1. You synthesize 50.0 g of sodium with 60.0 g chlorine gas to produce table salt. Please identify your limiting reactant and your excess reactant.
2. In a single replacement reaction between 50.0 g of zinc and 30.0 g of hydrochloric acid. What is your limiting reactant? How many grams of zinc chloride is produced? 3. 40.0 g of sodium iodide are combined with 50.0 g of silver nitrate. What is the limiting reactant? How many formula units of sodium nitrate are produced?

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