Orsat device of combustion products formed as a result of combustion of a fuel consisting of carbonaceous hydrogens and whose composition is unknown with air.

From the analysis made with $,$ it was seen that they contain $9\mathrm{.}5\%$ CO$2,1\mathrm{.}5\%$ CO and $5\mathrm{.}8\%$ O$2.$ According to this;

a$)$ Find the air fuel ratio and percent theoretical air amount.

b$)$ Find the dew point temperature of the combustion products.