Name _______________________________
CH4(g) + O2(g) = CO2(g) + H2O(g)
Methane gas
oxygen gas
carbon dioxide gas
water vapor
The first step to solving any stoichiometry problem is to balance the equation! Balance the equation above
before solving the problems!
1. What is the molar ratio of methane gas to oxygen gas in the balanced equation?
2. What is the molar ratio of methane gas to water vapor in the balanced equation?
3. If 8.0 moles of methane are reacted with an excess of oxygen, how many moles of water vapor will be
produced?
4. If 4.0 moles of oxygen gas (O2) are reacted with an excess of methane gas, how many moles of water
vapor will be produced?
5. How many atoms are in one molecule of carbon dioxide?
6. If 3.0 moles of carbon dioxide gas are produced in the reaction, how many moles of oxygen gas were
used in the reaction?
7. If 5.0 moles of water vapor are produced in the reaction, how many moles of oxygen gas were used in
the reaction?
8.
If 3.00 grams of methane are burned in an excess of oxygen gas, what mass of carbon dioxide is
produced?
9. If 3.00 grams of methane are burned in an excess of oxygen gas, what mass of oxygen will be used in
the combustion reaction?
10. If 3.00 grams of methane are burned in an excess of oxygen gas, what mass of water vapor should be
produced in the reaction?
CH4(g) + O2(g) = CO2(g) + H2O(g)
Methane gas
oxygen gas
carbon dioxide gas
water vapor
11. If 1.000 mole of methane is burned in an excess of oxygen gas, how many moles of oxygen gas were
used in the reaction?
12. If 1.000 mole of methane is burned in an excess of oxygen gas, how many moles of water are produced
in the reaction?
13. If 6.022 X 1023 methane molecules are burned in the reaction, what mass of water will be produced?
14. If 2.000 moles of water are produced in the reaction, how many molecules of carbon dioxide were
produced?
15. If 2.000 moles of carbon dioxide are produced by the reaction, what mass of water is produced by the
reaction?
16. If 1.00 gram of water is produced by the reaction, what mass of methane was consumed in the
reaction?
17. If 1.00 gram of carbon dioxide gas was produced in the reaction, what mass of oxygen gas was used in
the reaction?
Answers
1) 1:2
2) 1:2
3) 16 moles H2O
7) 5.0 moles O2
8) 8.23 g CO2
10) 6.74 g H2O
11) 2.000 moles O2
14) 6.022 X 1023 CO2 molecules
4) 4.0 moles H2O
5) 3 atoms
6) 6.0 moles O2
9) 12.0 g O2
12) 2.000 moles H2O
15) 72.06 g H2O
16) 0.445 g CH4
13) 36.03 g H2O
17) 1.45 g O2