A sample of coal has the following composition.

C $66\mathrm{.}30\%$

$N0\mathrm{.}76\%$

$H2O2\mathrm{.}73\%$

$H4\mathrm{.}44\%$

$4\mathrm{.}01O\%$

Ash $21\mathrm{.}76\%$

It is burned in a furwal, using $40\%$ excas air

The as has from the smoke is $25\%$ carbon etched by the wine.

Temperature at $18C,$ please. $740mm$; The air is assumed to be dry

Requinedi $(1)$ Vol. of eiu theoretically required to $10$ an $1kg$ of coal at std clouds

$(2)$ The volume actually used under the given clouds

$(3)$ tha Percentage composition of combustion products

$)$