   # Which of the following has the largest mass? (a) 0.50 mol Na (b) 0.20 mol K (c) 0.40 mol Ca (d) 0.60 mol Mg ### 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 3RC
Textbook Problem
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## Which of the following has the largest mass? (a) 0.50 mol Na (b) 0.20 mol K (c) 0.40 mol Ca (d) 0.60 mol Mg

Interpretation Introduction

Interpretation: The sample of atom which contains largest mass is to be identified from the given options.

Concept introduction:

Molar masses of Na, K, Ca and Mg are 23g, 39.09g, 40.07g and 24.03g respectively.

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

Numberofmoles=MassingramsMolarmass

### Explanation of Solution

The amount of calcium is given as 0.40mol .

Molar mass of calcium is 40.078g/mol .

Conversion formula for number moles of an atom into mass in grams,

Numberofmoles×Molarmass=Massingrams

Therefore,

The mass of calcium in grams is,

0.40mol×40.078g/mol=16.03g

Hence,

The option for the sample of atom which contains largest mass is (c).

(a) 0.50molofNa

(b) 0.20molofK

(d) 0

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