30.0 g Ethane burns in excess oxygen

Question

1) Write the balanced Combustion reaction
2) Determine the number of moles of oxygen required for complete combustion
3) What mass of carbon dioxide is produced?

Answer 1

2C2H6 + 7O2 ==> 4CO2 + 6H2O
b. moles C2H6 = g/molar mass = 30.0/30 = 1
1 mol C2H6 requires 7 moles O2 (look at the coefficients in the balanced equation).
c. 1 mol C2H6 will produce 2 mols CO2. Again, look at the equation. 1 mol CO2 x (4 mols CO2/2 mols C2H6) = 2 mols CO2
Then, g CO2 = mols CO2 x molar rmass CO2

Answer 2

Hm

-_-

Answer 3

Wait how