Verified Solution • 2025–26 Session moderate

QJEEM21Ch7fb5: JEE Main 2021 Chemistry - Class 11 JEEM21Ch7fb5 Solution: Complete combustion of 1.80 g of an oxygen containing compound…

Complete combustion of 1.80 g of an oxygen containing compound (CxHyOz) gave 2.64 g of CO2 and 1.08 g of H2O. The percentage of oxygen in the organic compound is :

Multiple Choice Options

  • A 51.63
  • B 50.33
  • C 63.53
  • D 53.33

Step-by-Step Verified Solution

CxHyOz + O2 →\to xCO2 + y2H2O{y \over 2}{H_2}O

2.64 g of CO2 contains 0.72 g C.

1.08 g of H2O contains 0.12 g H.

∴\therefore Mass of oxygen present = 1.80 – (0.72 +0.12) = 0.96 g

% of O = 0.961.80×100{{0.96} \over {1.80}} \times 100 = 53.33 %

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