Ask Question
13 February, 15:49

A hydrocarbon, subjected to elemental analysis, was found to contain 79.89 % carbon and 20.11 % hydrogen by mass. What is the empirical formula of the hydrocarbon?

+5
Answers (1)
  1. 13 February, 16:07
    0
    CH₃ is the empyrical formula for the hydrocarbon, a methyl group

    Explanation:

    Centesimal composition of hydrocarbon (X g / 100g of compound)

    79.89 % C and 20.11 % H

    We divide the mass of the composition, by the molar mass of the element:

    79.89 g / 12 g/mol = 6.66 moles C

    20.11 g / 1 g/mol = 20.11 moles H

    We divide again, by the lowest value of each. In this case, 6.66

    6.66 moles of C / 6.66 = 1 mol C

    20.11 moles of H / 6.66 = 3 mol H

    Molecular formula is CH₃

    In this case, molecular formula matches the empyrical one.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “A hydrocarbon, subjected to elemental analysis, was found to contain 79.89 % carbon and 20.11 % hydrogen by mass. What is the empirical ...” in 📗 Chemistry if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers