MasteringChemistry: Chp. 6 Quiz-Google Chrome Secure https://session.masteringch

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MasteringChemistry: Chp. 6 Quiz-Google Chrome Secure https://session.masteringchemistry.com/myc/itemView?offset-next&assignmentProblemID-86391872; Chp 6 Quz Exercise 6.120 Time Remaining: 00:07:16 Hide Exercise 6.120 Part A 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 79.3796. H. 8.88%; O, 11.75% The molar mass of estradiol is 272.37 g/mol. Find the molecular formula of estradiol Express your answer as a chemical formula. Submit My Answers Give Up

Explanation / Answer

we have mass of each elements as:

C: 79.37 g

H: 8.88 g

O: 11.75 g

Divide by molar mass to get number of moles of each:

C: 79.37/12.01 = 6.6087

H: 8.88/1.008 = 8.8095

O: 11.75/16.0 = 0.7344

Divide by smallest to get simplest whole number ratio:

C: 6.6087/0.7344 = 9

H: 8.8095/0.7344 = 12

O: 0.7344/0.7344 = 1

  

So empirical formula is:CHO

Molar mass of C9H12O = 9*MM(C) + 12*MM(H) + 1*MM(O)

= 9*12.01 + 12*1.008 + 1*16.0

= 136.186 g/mol

Now we have:

Molar mass = 272.37 g/mol

Empirical formula mass = 136.186 g/mol

Multiplying factor = molar mass / empirical formula mass

= 272.37/136.186

= 2

So molecular formula is:CHO

Answer: CHO

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