Question

Methane gas (carbon tetrahydride) reacts with oxygen by combustion: CH4 + 2O2 -> CO2 + 2H2O

a.)How many moles of methane are needed to produce 3.5*10-4 moles of carbon dioxide?

b.)How many moles of oxygen are needed to react form the 3.5*10-4 moles of carbon dioxide?

c.)How many atoms of oxygen would there be in your answer to question #3b?

Answer 1

CH4 + 2O2 ==> CO2 + 2H2O
a.
There is 1 mol CO2 produced for every mols CH4 used. Therefore you will need 3.5ER-4 mols CH4 to produce 3.5E-4 mols CO2.

b.
There is a flaw in how the question is state; what is the question? If it is how many mols O2 needed to react with the 3.5E-4 mols CH4 the answer is twice that number.

c. Since oxygen is a diatomic molecule (O2) the number of molecules O2 will be 6.02E23 x 3.5E-4 and the number of atoms will be double that.

Answer 2

Thank you for your help!