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# Solved: Which sample contains the greatest number of moles ISBN: 9780321910295 34

## Solution for problem 61P Chapter 6

Introductory Chemistry | 5th Edition

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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

Step 5 of 5

##### ISBN: 9780321910295

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