Download PRACTICE EXERCISES

PRACTICE EXERCISES
STOICHIOMETRY
Directions : Solve the following Problems . Write all your answers on the space provided
after each problem .
1.
What mass of Carbon dioxide is produced by the complete combustion of 100 g
of the hydrocarbon pentane, C5H12?
2.
How many grams of Nitric acid HNO3 are required to produce 8.75 g of
dinitrogen monoxide, N2O, according to the following equations?
4 Zn + 10 HNO3 ------- 4 Zn (NO3)2 + N2O + 5 H2O
3.
Given the equation for the combustion of isopropyl alcohol ;
2 C3H7OH + 9 O2 ------- 6 O2 + 8 H2O
What is the mol ratio of :
a.
b.
c.
d.
e.
f.
5.
carbon dioxide to isopropyl alcohol
isopropyl alcohol to oxygen
oxygen to carbon dioxide
water to isopropyl alcohol
carbon dioxide to water
water to oxygen
How may moles of Cl2 can be produced from 5.6 mol HCl
4 HCl + O2 ----- 2 Cl2 + H2O
6. Propane tanks are common place on recreational vehicles. The combustion of propane
and oxygen produces CO2 and H2O. Calculate the a) mass in grams of H2O and b) mL
volume of CO2 at STP from the combustion of 10.0 g of propane gas, C3H8.
7. How many mL of CO2 gas at STP are liberated from the decomposition of 1.59 g of
Lithium hydrogen Carbonate?
8. How many mL of O2 gas at STP are released from the decomposition of 2.50 g of
Mercuric oxide
9. How many grams of Manganese(II) chloride must react with sulfuric acid to release
49.5 mL of hydrogen Chloride gas at STP?
10. Given the unbalanced chemical equation , how many mL of CO2 gas at STP are
produced from the decomposition of 1.59 g of ferric carbonate ?
Fe2 (CO3)3 → Fe2O3 + 3 CO2
11. Given the unbalanced chemical equation, calculate the mass in grams of Zinc oxide
that can be produced from 2.36 g of Zinc metal
2 Zn + O2 → 2 ZnO
12. Given the unbalanced equation
:Al4C3 + H2O → Al (OH) 3 + CH4
a.)
How many moles of H2O are needed to react with 100 g of Al4C3?
b.)
How many moles of Aluminum hydroxide will be produced when 6 moles of
methane is formed.
13. Ethane gas, C2H6 burns in air ( reacts with oxygen in air) to form CO2 and H2O.
2 C2H6 + 7 O2 → 4 CO2 + 6 H2O
a)
How many moles of O2 are required to complete the combustion of 15 moles of
ethane.
b)
How many grams of CO2 are produced for each 8 g of H2O produced?
14. A 50 g sample of Calcium Carbonate is reacted with 35 g of Phosphoric Acid.
Calculate :
a). the number of grams of calcium phosphate that could be produced
b) grams of CO2 produced