Complete combustion of 750   g of an organic compound provides 420   g of CO 2 and 210   g of H 2 O . The percentage composition of carbon and hydrogen in organic compound is 15 . 3 and ______ respectively. (Round off to the Nearest Integer)

Step-by-step solution

44   gm CO 2 have 12   gm carbon So, 420   gm   CO 2 ⇒ 12 44 × 420 ⇒ 1260 11 gm carbon ⇒ 114 . 545 gram carbon So, % of carbon = 114 . 545 750 × 100 ≃ 15 . 3 % 18   gm   H 2 O ⇒ 2   gm   H 2 210   gm ⇒ 2 18 × 210 = 23 . 33   gm   H 2 So, %   H 2 ⇒ 23 . 33 750 × 100 = 3 . 11 % ≈ 3 %