Question

A compound containing only the elements C, H, and O was subjected to combustion analysis and the composition was determined to be C 38.71% and H 9.69%. From other experiments, the molar mass of the compound was found to be 62.0 g/mol. What is the compound's molecular formula?

Answer 1

An organic compound contains carbon, hydrogen and oxygen . Its elemental analysis gave C, 38.71% and H,9.67%
The empirical formula of the compound would be
(a)CHO(b)CH4O(c)CH3O(d)CH2O
A)
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Step 1. If you have masses go onto step 2. If you have % composition of the elements. Assume the mass to be 100g, so the % becomes grams.
Step 2. Determine the moles of each element.
Step 3. Determine the mole ratio by dividing each elements no. of moles by the smallest value from step 2.
Step 4. Double, triple, … to get an integer if they are not all whole numbers

Hence the empirical formula of the compound would be CH3O
Hence c is the correct answer.
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