What toxic, odorless gas is produced by a running engine?

1 Answer
Feb 13, 2017

Answer:

#"Carbon monoxide.............."#

Explanation:

The complete combustion of hydrocarbons, hexanes for instance, can be represented by the following reaction:

#"C"_6"H"_14"(l)" + 19/2"O"_2"(g)" rarr "6CO"_2"(g)" + "7H"_2"O(l)"#

We could represent incomplete combustion by assuming that SOME of the hydrocarbon was combusted to give carbon monoxide:

#"C"_6"H"_14"(l)" + "9O"_2"(g)" rarr "5CO"_2"(g)" + "CO(g)" + "7H"_2"O(l)"#

Alternatively, under conditions of deficient oxygen, some carbon, and some carbon monoxide may be generated:

#"C"_6"H"_14"(l)" + "8O"_2"(g)" rarr "4CO"_2"(g)" + "CO(g)" + "C(s)"+"7H"_2"O(l)"#

In terms of oxidation number, what is the difference between #"C"#, #"CO"#, and #"CO"_2#?