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AGN – Limiting Reactant
Which reactant will run out first????
Work these limiting reactant practice problems: Remember Balanced equation!!!
Name ________________________________________________ Date __________ Period ______
1) A solution containing 20.0 g of sodium sulfite reacts with 12.81grams of phosphoric acid. Determine the
following:
a) The balanced equation: ____ Na2SO3 + ____ H3PO4  ____ Na3 PO4 + ____ SO2 + ____ H2O
b) What mass of Na3 PO4 is produced if all 20.0 g of the sodium sulfite reacts?
c) What mass of Na3 PO4 is produced if all 12.81 g of the phosphoric acid reacts?
d) Which is the Limiting Reactant (hint: the reactant that produces the lowest mass of the same product)?
______________________
2) 75.0 grams of calcium oxide react with 130.1 grams of hydrochloric acid to produce a salt and water. How much
water is produced and what is the limiting reactant? ____ CaO + ____ HCl  ____________
3) How much aluminum oxide is produced when 46.5g of Al react with 165.37g of MnO? What is the limiting
reactant? ____ Al + ____ MnO  _________________ + ___________________
4) Given the following equation: ____ K + ____ Cl2 ---> ____ KCl . How many grams of KCl are produced from
2.50 g of K and 1.00 g of Cl2? What is the limiting reactant?
5) Silver sulfide (Ag2S) is the common tarnish on silver objects. What mass of silver sulfide can be made from 15.0
mg of Ag and 1.23 mg of hydrogen sulfide obtained from a rotten egg? What is the limiting reactant?
____ Ag(s) +____ H2S(g) + ____ O2(g)  ____ Ag2S(s) + ____ H2O(l)
AGN – Limiting Reactant
Which reactant will run out first????
Work these limiting reactant practice problems: Remember Balanced equation!!!
6) A somewhat antiquated method for preparing chlorine gas involves heating hydrochloric acid with pyrolusite
(manganese dioxide), a common manganese ore. (Reaction given below.) How many kg of MnCl2 from 3.56 kg
HCl react with 5.69 kg of manganese dioxide? What is the limiting reactant?
____ HCl(aq) + ____ MnO2(s)  ____ H2O(l) + ____ MnCl2 (aq) + ____ Cl2(g)
7) If 5.5 grams of copper metal react with a solution containing 20.6 grams of silver nitrate to produce copper (II)
nitrate and silver.
a) Balance equation: ____________________________________________________________
b) How much copper would be needed to completely react silver nitrate? (theoretical yield)
c) What is the limiting reactant?
____________________________________________________
d) How much of the excess reactant would be left over? (Subtract theoretical from actual)
8) Given the following equation: ____ Na2O + ____ H2O  ____ NaOH. How many grams of NaOH are produced
from 1.20 x 102 grams of Na2O and 3.44 x 106 grams of H2O? What is the limiting reactant?
9) Given the following equation: ____ Fe + ____ S8  ____ FeS. What mass of iron (II) sulfide will be produced
from 32.0 grams of iron react with 16.0 grams of sulfur? What is the limiting reactant?
10) Molten iron and carbon monoxide are produced in a blast furnace by the reaction of iron (III) oxide and coke (pure
carbon). If 25.0 kilograms of pure Fe2O3 and 21.4 kilograms of Carbon react, how many kilograms of iron can be
produced? What is the limiting reactant?
____ Fe2O3 + ____ C  ____ Fe + ____ CO