Question

In: Chemistry

Now that Hermione understands empirical formulas she wants to teach Harry and Ron. What is the...

Now that Hermione understands empirical formulas she wants to teach Harry and Ron. What is the empirical formula for dibromoethane: C₂H₄Br₂

A. CH₂Br₂

B. CH₂Br

C. C₂H₄Br

D. CHBr

E. C₂H₂Br₂

2.Calculate the maass percent composition of carbon in C₂H₅Cl.

Expert Solution

(1) The empirical formula is the simplest formula for a compound.

Given molecular formula of dibromoethane is C₂H₄Br₂

A molecular formula is the same as or a multiple of the empirical formula, and is based on the actual number of atoms of each type in the compound.

The ratio of C , H , Br in C₂H₄Br₂ is C : H : Br = 2 : 4 : 2

The simplest ratio is C : H : Br = 1 : 2 : 1

So the emperical formula is CH₂Br

(2) Given compound is C₂H₅Cl

Molar mass of C₂H₅Cl is = ( 2xAt.mass of C ) + (5xAt.mass of H ) + At.mass of Cl

= ( 2x12) + ( 5x1) + 35.5

= 64.5 g/mol

Molar mass of C is = 12 g/mol

So the mass percent of C = ( mass of C / Molar mass of C₂H₅Cl) x 100

= ( 12 / 64.5) x 100

= 18.6

Therefore the mass percent composition of carbon in C₂H₅Cl is 18.6 %

queen_honey_blossom answered 2 years ago

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