8.5 – Stoichiometry Word Problems
1. 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 HCl react with 5.69 kg of manganese dioxide?
___HCl + ___MnO2 → ___H2O + ___MnCl2 + ___Cl2
2. Given the following equation: 2 C4H10 + 13 O2 ---> 8 CO2 + 10 H2O, show what the following
molar ratios should be.
a. C4H10 / O2 b. O2 / CO2 c. O2 / H2O
d. C4H10 / CO2 e. C4H10 / H2O
3. Given the following equation: ___KClO3 ---> ___KCl + ___O2
How many moles of O2 can be produced by letting 12.00 moles of KClO3 react?
4. Given the following equation: ___K + ___Cl2 ---> ___KCl
How many grams of KCl is produced from 2.50 g of K and excess Cl2.
5. Given the following equation:___ Na2O + ___H2O ---> ___NaOH
How many grams of NaOH is produced from 120 grams of Na2O?
6. Given the following equation: ___Fe + ___S8 ---> ___FeS
What mass of iron is needed to react with 16.0 grams of sulfur?
7. Given the following equation: ___ NaClO3 ---> ___NaCl + ___O2
12.00 moles of NaClO3 will produce how many grams of O2?
8. Given the following equation: ___Cu + ___AgNO3 ---> ___Cu(NO3)2 + ___Ag
How many moles of Cu are needed to react with 3.50 moles of AgNO3? If 89.5 grams of Ag were
produced, how many grams of Cu reacted?
9. The average human requires 120.0 grams of glucose (C6H12 O6) per day. How many grams of
CO2 (in the photosynthesis reaction) are required for this amount of glucose? The photosynthetic
reaction is:
___CO2 + ___H2O ---> ___C6H12 O6 + ___O2
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