Cumene, a hydrocarbon, is 89.94% carbon, and its molar mass is 120.2 g/mol. What are the a) empirical and...

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Chemistry

Cumene, a hydrocarbon,is 89.94% carbon, and its molar mass is 120.2 g/mol.
What are the
a)empirical and b) molecularformulas for Cumene? Show your work

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4.3 Ratings (920 Votes)

C%Â Â = 89.94%

H%Â Â Â = 100-C%

Â Â Â Â Â Â Â Â Â = 100-89.94

Â Â Â Â Â Â Â Â Â Â Â = 10.06%

ElementÂ Â Â Â Â Â Â Â Â Â %Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â A.WtÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Relative numerÂ Â Â Â Â Â Â Â Â Â simple ratioÂ Â Â Â Â simplest ratio

CÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 89.94Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 12Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 89.94/12 = 7.495Â Â Â Â Â Â Â Â Â Â 7.495/7.495 = 1Â Â Â Â Â Â Â Â Â 1*3 = 3

HÂ Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 10.06Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 1Â Â Â Â Â Â Â Â Â Â Â Â Â 10.06 /1 = 10.06Â Â Â Â Â Â Â Â Â Â 10.06/7.495 = 1.342Â Â Â Â Â 1.342*3 = 4

Â Â Â Â Â Â Â Â Â Â Â Â Â Â The empirical formulaÂ Â = C3H4

Â Â Â Â Â Â Â Â Â Â Â Empirical formula massÂ Â = 40g/mole

Â Â Â Â Â Â Â Â Â Â molar mass = 120.2 g/mol.

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â molecular formulaÂ Â Â Â = (empirical formula)n

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â nÂ Â Â Â Â Â = molar mass/empirical formula mass

Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â = 120.2/40Â Â = 3

molecular formulaÂ Â = (C3H4)3Â Â = C9H12

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