0.25 g of an organic compound “A” containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl2 tube and potash tube at the end of the experim

Question

0.25 g of an organic compound “A” containing carbon, hydrogen and oxygen was analysed using the combustion method. There was an increase in mass of CaCl2 tube and potash tube at the end of the experiment. The amount was found to be 0.15 g and 0.1837 g, respectively. The percentage of oxygen in compound A is ________%. (Nearest integer) (Given : molar mass in g mol –1 H : 1, C : 12, O : 16)

Prashant Kotian · Accepted Answer

Correct answer: .. CxHyOz + O2  CO2 + H2O t = 0 0.25 gm teq – 0.18 gm 0.15 gm Mass of ‘C’ = 0.18 44 × 12 = 0.049 0.05 gm Mass of ‘H’ = 0.15 18 × 2 = 0.016 0.017 gm. Mass of ‘O’ = 0.25 – 0.05 – 0.017 = 0.1833 gm Mass % of ‘O’ = 0.1833 0.25 × 100 = 73.32%.

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