JEE Main 2022 Chemistry question
116 g of a substance upon dissociation reaction, yields 7.5 g of hydrogen, 60 g of oxygen and 48.5 g of carbon. Given that the atomic masses of H, O and C are 1, 16 and 12, respectively. The data agrees with how many formulae of the following? . A. B. HCHO C. D.
Answer: 2
Solution
The mass percentages are H 6.46%, O 51.72% and C 41.81%. The mole ratios are H : O : C = 6.46 : 3.23 : 3.48, i.e. approximately 2 : 1 : 1, so the
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