   # Which quantity represents the largest amount (moles) of the indicated substance? (a) 6.02 × 10 23 molecules of H 2 O (b) 22 g of CO 2 (c) 3.01 × 10 23 molecules of Br 2 (d) 30 g of HF ### 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 4RC
Textbook Problem
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## Which quantity represents the largest amount (moles) of the indicated substance? (a) 6.02 × 1023 molecules of H2O (b) 22 g of CO2 (c) 3.01 × 1023 molecules of Br2 (d) 30 g of HF

Interpretation Introduction

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

Concept introduction:

Molar masses of H2O , CO2 , Br2 and HF are 18g, 44g, 159.8g and 20g respectively.

• Conversion formula for mass of an atom into number moles,

Numberofmoles=MassingramsMolarmass

• Conversion formula for number of molecules and number of moles,

Numberofmolecules=numberofmoles×6.022×1023molecules/mol

### Explanation of Solution

The mass of ( HF ) is given that 30g.

Conversion formula for mass of an atom into number moles,

Numberofmoles=MassingramsMolarmass

Therefore,

The number of moles of HF is,

Numberofmoles=30g20g/mol=1.5mol

Hence,

The option for the molecule which contains largest number of moles is (d).

(a) 6.022×1023moleculesofH2O

(b) 22gofCO2

(c) 3.01×1023moleculesofBr2

1. (a) 6.022×1023moleculesofH2O
• Conversion formula for number of molecules and number of moles,

Numberofmolecules=numberofmoles×6.022×1023molecules/mol

Therefore,

The number of moles of H2O is,

Numberofmoles=6.022×1023moleculesofH2O6.022×1023molecules/mol =1mole

(b) 22gofCO2

The mass of ( CO2 ) is given that 22g

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