Chemistry, 25.10.2019 21:43 hunter3978

Estradiol is a female sexual hormone that causes maturation and maintenance of the female reproductive system. elemental analysis of estradiol gave the mass percent composition: c, 79.37%; h, 8.88%; o, 11.75%. the molar mass of estradiol is 272.37 g/mol. find the molecular formula of estradiol.

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Answer from: naomicervero

The answer to your question is: Molecular formula = C₁₈H₂₄O₂

Explanation:

Estradiol

C = 79.37 %

H = 8.88 %

O = 11.75 %

Molar mass = 272.37

Process

Carbon = 79.37 g

Hydrogen = 8.88 g

Oxygen = 11.75 g

12 g of Carbon 1 mol

79.37 g x

x = (79.37 x 1) / 12

x = 6.61 mol

1 g of Hydrogen 1 mol

8.88 g x

x = (8.88 x 1 ) / 1

x = 8.88 mol

16 g of Oxygen 1 mol

11.75 g x

x = (11.75 x 1) / 16

x = 0.73

Divide by the lowest number of moles

Carbon = 6.61 / 0.72 = 9.2

Hydrogen = 8.88 / 0.73 = 12.2

Oxygen = 0.73/0.73 = 1

Empirical formula

C₉H₁₂O₁

MW of the empirical formula = (12 x 9) + (12 x 1) + (16 x 1)

= 136 g

Divide molar mass of estradiol by the molar mass of the empirical formula.

= 272 / 136

= 2

Then the molecular formula is:

2(C₉H₁₂O) = C₁₈H₂₄O₂

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Answer from: Quest

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