   # Tris(pentatluorophenyl)borane, commonly known by its aeronym BARF, is frequently used to initiate polymerization of ethylene or propylene in the presence of a catalytic transition metal compound. It is composed solely of C, F, and B; it is 42.23% C and 55.66% F by mass. a. What is the empirical formula of BARF? b. A 2.251-g sample of BARF dissolved in 347.0 mL of solution produces a 0.01267- M solution. What is the molecular formula of BARF? ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243

#### Solutions

Chapter
Section ### Chemistry: An Atoms First Approach

2nd Edition
Steven S. Zumdahl + 1 other
Publisher: Cengage Learning
ISBN: 9781305079243
Chapter 6, Problem 142IP
Textbook Problem
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## Tris(pentatluorophenyl)borane, commonly known by its aeronym BARF, is frequently used to initiate polymerization of ethylene or propylene in the presence of a catalytic transition metal compound. It is composed solely of C, F, and B; it is 42.23% C and 55.66% F by mass.a. What is the empirical formula of BARF?b. A 2.251-g sample of BARF dissolved in 347.0 mL of solution produces a 0.01267-M solution. What is the molecular formula of BARF?

a)

Interpretation Introduction

Interpretation: The empirical formula of BARF has to be determined.

Concept Introduction: The representation of simplest positive integer of a atoms in a compound is called as empirical formula.

### Explanation of Solution

Given:

Record the given data

Mass of carbon = 42.33g

Mass of Fluorine = 55.66g

Mass of boron = 2.11g

The mass of carbon, fluorine and boron are recorded as shown above.

To calculate the empirical formula of BARF

The mole of individual elements has to be calculated.

Atomic mass of C=12.01g

Atomic mass of F=19.00g

Atomic mass of B=10.81g

Mol C= 42.23g1molC12.01gC=3.516molC

Mol F= 55.66g1molF19.00gF=2.929molF

Mol B= 2

b)

Interpretation Introduction

Interpretation: The molecular formula of BARF has to be determined.

Concept introduction: Molecular formula is a chemical formula that is a representation of total number and kinds of atoms and molecules.

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