Question

#12

12. Terephthalic acid, used in the production of polyester fibers and films, is composed of carbon hydrogen, and oxygen. When 0.6943 g of terephthalic acid was subjected to a combustion, analysis it produced 1.471 g of CO2 and 0.226 g of H2O. What is the empirical formula?

Answer 1

Empirical formula is the simplest integral ratio of the number of atoms To find the empirical formula (EF) we have to calculate the olo c, uso H and O. mass of terephthalic acid = 0.69439 mco = 1.4719, in 40 = 0.2269. we know 440g co contains 12.01g c and 18.015 g Ho contains 2.016 g Hydrogen. % C = 12.01 x 1.4719x100 = 57.7697 44.01 0.69439 of H = % To tind Element 0 = simple s. 57.769 Ratio 2.016 x 0.2269x100 = 3.6437 18.015 0.69939 100-157.769 +3643) = 38.588? integral ratio, find molar ratio Atomic Ratio (1./ Atwt) simple molar Ratio simple 57.769 -4.810 4 810 = 1990 2.0 2.0x2=4 12.01 2.412 3.643 = 3.614 3.614 = 1.498 x 1.5 1.5x2=3. 2.412 1008 1x2=2 38.588 2.412 2:412 = 1:00 15-999 2 .412 н 3.643 38.588 Empirical formula = CHO 4 3 12