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Solved: Which sample contains the greatest number of moles

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 61P Chapter 6

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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5
Problem 61P

Which sample contains the greatest number of moles of O?

(a) 2.3 mol H2O

(b) 1.2 mol H2O2

(c) 0.9 mol NaNO3

(d) 0.5 mol Ca(NO3)2

Step-by-Step Solution:

Solution 61P

Step 1:

We know that to calculate number of moles we have the formula

Number of moles = weight of substance /molecular weight of substance

By using the above formula we can calculate the number of moles of substances after calculating the given compounds we get the following results :

Step 2:

(a) 2.3 mol H2O

Number of moles = weight of substance /molecular weight of substance

                  =2.3 moles /18.

                  =0.12 moles.

                  =0.12/16=0.0075 moles of oxygen

Step 3 :

(b) 1.2 mol H2O2

Number of moles = weight of substance /molecular weight of substance

                              =1.2/34

                             =0.03 moles

                             =0.03/32

                             =0.0009 moles of oxygen .

Step 4 of 5

Chapter 6, Problem 61P is Solved
Step 5 of 5

Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

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