Stoichiometry Review

Use a periodic table, but NO calculator! Round molar masses to the "ones" place.

Fill in all the answer, written as a number, then press "Check" (bottom of the page) to check your answers. If you express your answer as a fraction, be sure to reduce it to simplest terms.
1. In the formation of carbon dioxide from carbon monoxide and oxygen, how many moles of carbon monoxide are needed to react completely with 7.0 moles of oxygen gas?
2 CO (g) + O2(g) → 2 CO2 (g)

moles


2. How many moles of carbon dioxide, CO2, can be formed by the decomposition of 5 moles of aluminum carbonate, Al2(CO3)3?
Al2(CO3)3 → Al2O3 + 3 CO2

moles


3. In the formation of carbon dioxide from carbon monoxide and oxygen, how many liters of carbon monoxide, CO, are needed to react completely with 1/2 mole of oxygen gas at STP?
2 CO (g) + O2(g) → 2 CO2 (g)

liters


4. How many moles of oxygen are required to burn 22.4 liters of ethane gas, C2H6 at standard conditions?
2 C2H6 (g) + 7 O2(g) → 4 CO2 (g) + 6 H2O (g)

moles


5. How many grams of oxygen are produced by the decomposition of 1 mole of potassium chlorate, KClO3?
2 KClO3 → 2 KCl + 3 O2

grams


6. A chemist performs the synthesis of sodium chloride from its elements. The chemist begins with 46 grams of sodium. How many moles of chlorine are needed?
2 Na + Cl2 → 2 NaCl

moles


7. How many grams of water can be prepared from 5 moles of hydrogen at standard conditions?
2 H2 (g) + O2(g) → 2 H2O

grams


8. Suppose that an excess of propane, C3H8 burns in 320 g of O2. How many moles of H2O will be formed?
C3H8 + 5 O2 → 3 CO2 + 4 H2O

moles


9. At standard conditions, how many liters of carbon dioxide, CO2, will be formed by the combustion of 1/2 mole of propane, C3H8?

C3H8 + 5 O2 → 3 CO2 + 4 H2O

liters


10. Ammonia, NH3, is commercially prepared by the Haber process. How many moles of ammonia can be formed from 44.8 liters of nitrogen gas and an excess of hydrogen at standard conditions?
3 H2 (g) + N2(g) → 2 NH3 (g)

moles


11. How many liters of hydrogen, H2, are needed to react with 10 liters of nitrogen gas in the reaction forming ammonia?
3 H2 (g) + N2(g) → 2 NH3 (g)

liters


12. How many grams of water can be prepared from 8 grams of hydrogen at standard conditions?
2 H2 (g) + O2(g) → 2 H2O

grams


13. How many grams of carbon dioxide are produced by the combustion of 22.4 liters of ethane gas, C2H6 at standard conditions?
2 C2H6 (g) + 7 O2(g) → 4 CO2 (g) + 6 H2O (g)

grams


14. How many liters of oxygen, at standard conditions, are required to react with 30 grams of glucose, C6H12O6?

C6H12O6 (s) + 6 O2(g) → 6 CO2 (g) + 6 H2O (g)

liters


15. How many grams of calcium must react with of sulfuric acid, H2SO4, in order to produce 5.6 liters of hydrogen gas?
Ca + H2SO4 → CaSO4 + H2

grams


16. How many grams of calcium will react with 44.8 liters of oxygen gas at standard conditions?
2 Ca + O2 → 2 CaO

grams


17. A certain amount of glucose, C6H12O6 burned in oxygen, and produced 22 grams of carbon dioxide, CO2. How many grams of water was produced at the same time?
C6H12O6 (s) + 6 O2(g) → 6 CO2 (g) + 6 H2O (g)

grams


18. How many liters of oxygen are required to react completely with 22.4 liters of carbon monoxide, CO, at standard conditions?
2 CO (g) + O2(g) → 2 CO2 (g)

liters