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Calculate the percent composition of C14H9Cl5 (DDT).

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tdj4325 | Salutatorian

Posted July 12, 2012 at 7:36 PM via web

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Calculate the percent composition of C14H9Cl5 (DDT).

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justaguide | College Teacher | (Level 2) Distinguished Educator

Posted July 12, 2012 at 7:49 PM (Answer #1)

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DDT which has a molecular formula of C14H9Cl5 has 14 atoms of carbon, 9 atoms of hydrogen and 5 atoms of chlorine. The atomic mass of carbon, hydrogen and chlorine is 12, 1 and 35 respectively. The molecular mass of DDT is 12*14 + 1*9 + 35*5 = 352

The percent composition is:

carbon: 168/352 = 47.7%

hydrogen: 9/352 = 2.5%

chlorine: 175/352 = 49.7%

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Jyotsana | TA , Grade 10 | Valedictorian

Posted February 23, 2014 at 3:45 PM (Answer #2)

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C14=14*12

H9=9*1

Cl5=5*35

168+9+175=352g/mole

Carbon= (168/352)*100= 47.7%

Hydrogen= (9/352)*100=2.6%

Chlorine= (175/352)*100= 49.7%

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