Answered

When 1.00 g of a compound containing only carbon and hydrogen is burned completely, 3.14 g of co2 and 1.29 g of h2o is produced. what is the empirical formula?



Answer :

Eduard22sly

The empirical formula of the compound is CH₂

How to determine the mass of Carbon

  • Mass of CO₂ = 3.14 g
  • Molar mass of CO₂ = 44 g/mol
  • Molar of C = 12 g/mol
  • Mass of C =?

Mass of C = (12 / 44) × 3.14

Mass of C = 0.86 g

How to determine the mass of H

  • Mass of H₂O = 1.29 g
  • Molar mass of H₂O = 18 g/mol
  • Molar of H = 2 × 1 = 2 g/mol
  • Mass of H =?

Mass of H = (2 / 18) × 1.29

Mass of H = 0.14 g

How to determine the empirical formula

  • C = 0.86 g
  • H = 0.14 g
  • Empirical formula =?

Divide by their molar mass

C = 0.86 / 12 = 0.07

H = 0.14 / 1 = 0.14

Divide by the smallest

C = 0.07 / 0.07 = 1

H = 0.14 / 0.07 = 2

Thus, the empirical formula of the compound is CH₂

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