What is the balanced equation for the complete combustion of #"C"_2"H"_6"#?

1 Answer
Apr 12, 2017

Answer:

Balanced Equation:

#"2C"_2"H"_6 + "7O"_2##rarr##"4CO"_2 + "6H"_2"O"#

Explanation:

General rules for balancing combustion equations:

  1. Balance the carbons: If the alkane has an even number of carbon atoms, place a coefficient of 2 in front of its formula, then balance the carbons.
  2. Balance the hydrogens.
  3. Balance the oxygens.

Balance the carbons. Since the formula for the alkane #"C"_2"H"_6"# has an even number of carbon atoms, place a coefficient of #2# in front of its formula first. Next place a #4# in front of the #"CO"_2"#.

#color(red)("2")"C"_2"H"_6 + "O"_2##rarr##color(red)("4")"CO"_2 + "H"_2"O"#

Balance the hydrogens.
Place a #6# in front of the #"H"_2"O"#.

#"2C"_2"H"_6 + "O"_2##rarr##"4CO"_2 + color(red)("6")"H"_2"O"#

Balance the oxygens.
Place a #7# in front of the #"O"_2"#.

#"2C"_2"H"_6 + color(red)("7")"O"_2##rarr##"4CO"_2 + "6H"_2"O"#