Methane gas is burned releasing Carbon Dioxide into the atmosphere. How much CO2 (g) is released if 78.5 Liters of Methane is burned? CH4 + O2 --> CO2 + H2O

Answer 1

CH4 + 2O2 ==> CO2 + 2H2O
When dealing with gases one may use a shortcut and not convert L to mols. Instead one may use L directly.
You have 78.4L CH4, convert that to L CO2 by
78.4 L CH4 x (1 mol CO2/1 mol CH4) = 78.4 x 1/1 = ?