   # Which of the following contains the largest number of molecules? (a) 24 g of O 2 (b) 4.0 g of H 2 (c) 19 g of F 2 (d) 28 g of N 2 ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 2.9, Problem 2RC
Textbook Problem
1 views

## Which of the following contains the largest number of molecules? (a) 24 g of O2 (b) 4.0 g of H2 (c) 19 g of F2 (d) 28 g of N2

Interpretation Introduction

Interpretation: The molecule which contains largest number of molecules is to be identified from the given options.

Concept introduction:

Molar masses of O2 , H2 , F2 and N2 are 32g, 2.016g, 38g and 28.012g respectively.

Conversion formula for number of molecules from mass,

Numberofmolecules=MassingramsMolarmass×6.022×1023molecules/mol

### Explanation of Solution

The mass of ( H2 ) is given that 4g.

Conversion formula for number of molecules from mass,

Numberofmolecules=MassingramsMolarmass×6.022×1023molecules/mol

Therefore,

The number of molecules of hydrogen is,

Numberofmolecules=4g2.016×6.022×1023molecules/mol =11.948×1023molecules

Hence,

The option for the molecule which contains largest number of molecules is (b).

(a) 24gofO2

(c) 19gofF2

(d) 28gofN2

Conversion formula for number of molecules from mass,

Numberofmolecules=MassingramsMolarmass×6.022×1023molecules/mol

1. (a) 24gofO2

Therefore,

The number of molecules of oxygen is,

Numberofmolecules=24g32×6

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