$3.$ What are the theoretical and actual air$-$fuel ratios and the wet and dry mole flue gas compositions for $15\%$ excess air? Write the citation. Compositions: H$2(1\mathrm{.}82\%),$ CH$4(93\mathrm{.}58\%),$ CO$2(0\mathrm{.}22\%),$ N$2(3\mathrm{.}4\%),$ O$2(0\mathrm{.}53\%),$ and CO $(0\mathrm{.}45\%)$