Name
_
Hr.
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Stoichiometry Worksheet 4
Limiting Reactant Problems
The limiting reactant sets a limit on the amount of product that can be made. In these types of problems you
will be given two measured amounts, i.e., there will be two givens and one wanted.
1) If 7.00 g of butane (C4H10) is reacted with 7.00 g of oxygen to produce carbon dioxide and water, how
many g of carbon dioxide would be produced?
First step: Write the balanced equation and identify the givens and wanted.
Second step: In solving this problem you notice that have been given two given measured amounts. You
need to do TWO mass-mass problems stoichiometry problems, one for each
reactant:
7.00g C4H10
7.00 g O2
Third step: Analyze the results. You have to find the reactant that gives you the LEAST amount of product.
This substance is the limiting reactant—it will be used up in the reaction. The other reactant is in EXCESS—
there will be some of it left over when the reaction is complete. The amount of product formed by the limiting
reactant is the amount that can be made with those quantities of the substances.
In this problem the limiting reactant is
the excess reactant is
The amount of carbon dioxide formed is ________________ g.
Turn the page over!!
Name
_
Hr.
2) 2.50 g of hydrogen is reacted with 2.75 g of oxygen. What mass of water can be produced?
Balanced Equation:
mass-mass stoichiometry problems:
a.
b.
Limiting Reactant:
Excess Reactant:
Mass of product:
3) What mass of NaOH will be produced if 12.5g of Na is reacted with 48.0g Zn(OH)2 ?
Limiting Reactant:
Excess Reactant:
Mass of product:
4) How much tin (II) bromide can be produced from 1.58g of tin and 2.75g of bromine gas?
Limiting Reactant:
Excess Reactant:
Mass of product:
______