When 4-ketopentenoic acid is analyzed by combustion, it is found that a 0.3000g sample produces 0.579 g of CO2 and 0.142 g of H2O. The acid contains only carbon, hydrogen, and oxygen. What is the empirical formula of the acid

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pstnonsonjoku pstnonsonjoku · Answer 1 · 2021-01-21T02:29:12+01:00

Answer:

C5H6O3

Explanation:

Number of moles of hydrogen = 0.142 * 2 /18 = 0.0158 moles of H

Number of moles of carbon = 0.579 * 1/44 = 0.013 moles of C

Mass of C = 0.013 moles of C * 12 = 0.156 g

Mass of H = 0.0158 moles of H * 1 = 0.0158 g

Mass of oxygen = 0.3000 - (0.156 + 0.0158 )

Mass of oxygen = 0.1282 g

Number of moles of oxygen = 0.1282 g/16 g/mol = 0.008 moles of O

Dividing through by the lowest number of moles

C-0.013/0.008 , H- 0.0158 /0.008 , O- 0.008/0.008

1.625, 1.975, 1 (multiply through by 3)

5, 6, 3

The required empirical formula is C5H6O3