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.

Question

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)

TestHub · Accepted Answer

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 %

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