Question

In: Chemistry

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

Cumene, a hydrocarbon, is 89.94% carbon, and its molar mass is 120.2 g/mol.

What are the

a) empirical and b) molecular formulas for Cumene? Show your work

Expert Solution

C% = 89.94%

H% = 100-C%

= 100-89.94

= 10.06%

Element % A.Wt Relative numer simple ratio simplest ratio

C 89.94 12 89.94/12 = 7.495 7.495/7.495 = 1 1*3 = 3

H 10.06 1 10.06 /1 = 10.06 10.06/7.495 = 1.342 1.342*3 = 4

The empirical formula = C3H4

Empirical formula mass = 40g/mole

molar mass = 120.2 g/mol.

molecular formula = (empirical formula)n

n = molar mass/empirical formula mass

= 120.2/40 = 3

molecular formula = (C3H4)3 = C9H12

queen_honey_blossom answered 2 years ago

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