What is the mole ratio of #CO(g)# to #CO_2(g)# in the reaction #2CO(g) + O_2(g) -> 2CO_2(g)#?
The mole ratio that exists between two chemical species that take part in a chemical reaction is simply the ratio that exists between the stoichiometric coefficients added in front of said species.
In your case, you have
#color(blue)(2)"CO"_ ((g)) + "O"_ (2(g)) -> color(red)(2)"CO"_ (2(g))#
According to the balanced chemical equation that describes this reaction, the reaction consumes
So, carbon monoxide has a coefficient of
This means that the mole ratio that exists between carbon monoxide and carbon dioxide will be
#(color(blue)(2)color(white)(.)"moles CO")/(color(red)(2)color(white)(.)"moles CO"_2) = color(blue)(2)/color(red)(2) = 1/1#
Because the two coefficients are equal, we say that the two compounds have a