How are carbon and hydrogen of an organic compound estimated?

Explanation

Estimation of carbon and hydrogen : Both the elements are estimated in the same experiment simultaneously. A known weight of the organic substance is taken and complely burnt in excess of air and copper (ll) oxide carbon changes to `CO _(2).` and Hydrogen to `H _(2)O.`
`C _(x) H _(y) + (x +(y)/(4)) O _(2) to x CO _(2) ((y)/(2)) H _(2)O`
`CO _(2) and H _(2) O SO` obtained are passed through already weighed .U.- tubes containing anhy, `CaCl _(2)` and caustic potash respectively. The increased weight is of these two tubes give the weight of `H _(2)O` formed and weight of `CO _(2)` formed.
Suppose .a. g of organic compound on combustion gives .b. grams of water vapour and .C. g of `CO _(2). ` Then
`%` g of Carbon `- (12)/(44) xx (12)/(44) xx (100)/(a) xx Cg`
`%` g of hydrogen `= (2)/(18) xx (100)/(a) xx b g`