Chapter sis-CHEM x .\' × G A compound contai. G uing The Mass Spe × w Mathway 1
ID: 705149 • Letter: C
Question
Chapter sis-CHEM x .' × G A compound contai. G uing The Mass Spe × w Mathway 1 Algebra l x wnorton.com/162337student set Sb1fb97e917cc76daa7de4568settings 07/08/1B 71% 15 Question (2 points) A compound containing only C.H.andO was extracted from the bark of the sassalras tree. The combustion of 31.9 mg produced 86.6 mg of CO and 17.7 mg of H,/0. The molar mass of the compound was 162 g/mol Determine its empirical and molecular formulas v 1st attempt Part 1 (1 point) See periodic Table Note that formudlas of organic compounds should hrst list the carbon and hydrogen with the rest of the atoms lsted in alphabetical order For thals problem use the format C,H,O, where x x and z are subscripts of 2 or greater Empirical Formula: Part 2 (1 point) ? See Hint Molecular Formula 15/9>Explanation / Answer
86.6 mg of CO2 contains 23.634 mg of C
( 86.6*12.011/44.0098)
17.7 mg of H2O contains 4.4516mg of H
( 17.7*2.01588/8.01528)
31.9 mg of sample contains 3.8144 mg of O
(31.9-23.634-4.4516)
Moles of C = 23.634*10^-3/12.011 = 1 .9676*10^-3
Moles of H = 4.4516*10^-3/1.00794= 4.4165*10^-3
Moles of O = 3.8144*10^-3/15.9994 = 0.2384*10^-3
Their ratio is, C:H:O = 8:17:1
Empirical formula= C8H17O
Molar mass = 162g, given molar mass= 162g
Molecular formula= C8H17O