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https://session.masteringchemistry.com/myct/temview?offset-nextBassignmentProblemlDe 70254887 CHEM 1524.810 CH24 Problem 24.98 Problem 24.98 Part A An unknown substance is found to contain only carbon and What is the identity of the unknown compound? hydrogen, It is a liquid that boils at 49 eCat 1 atm pressure. analysis it is found to contain 85.7% carbon and 14.3% hydrogen by mass. At 100 Cand 735 torr, the vapor of this cyclohexane unknown has a density of 2.21g/L. When it is dissolved in O cyclopentane hexane solution and bromine water is added, no reaction occurs. O pentene O hexene Submit My Answers Give UpExplanation / Answer
no of moles of Carbon for 85.7g = 85.7/12 =7.14 moles
no of moles of hydrogen for 14.3 g = 14.3/1.008 = 14.18 moles
emprical formula
for carbon = 7.14/7.14 = 1
for hydrogen = 14.3/7.14 = 2
therefore emprical formula = CH2
since there is no reaction with bromine water it cannot be hexene or pentene.
therefore the compound must be cyclohexane or cyclopentane
the boiling point of cyclopentane is 49 deg Celusius
therefore the compound is cyclopentane
answer is option b. cyclopentane
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