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A compound consists of 52.17% of carbon, 13.04% of hydrogen and 34.78% of oxygen. Find the molecular formula if the given molecular weight of the compound is 46g.

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A compound consists of 52.17% of carbon, 13.04% of hydrogen and 34.78% of oxygen. Find the molecular formula if the given molecular weight of the compound is 46g.

(a) C2H5OH

(b) C2H6

(c) C6H12O6

(d) CH2O

I have been asked this question in semester exam.

My enquiry is from Percentage Composition in portion Chemistry Basic Concepts of Chemistry – Class 11

1 Answer

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Right answer is (a) C2H5OH

The explanation: As per the above question, the compounds consist of carbon, hydrogen, and oxygen in the ratio of 52.17:13.04:34.78 respectively. Now multiply the ratio with the molecular mass that is 46 g. Hence we obtain it as 2400:600:1600 that is 24:6:16 (2 atoms of carbon + 6 atom of hydrogen + 1 atom of oxygen). The required compound is C2H5OH.

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