   # 3.60 Copper can have improved wear resistance if alloyed with ceramic alumina, A1 2 O 3 . If a copper alloy has 8.5 wt% A1 2 O 3 , what is its composition in mol%? ### Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781337398909 ### Chemistry for Engineering Students

4th Edition
Lawrence S. Brown + 1 other
Publisher: Cengage Learning
ISBN: 9781337398909
Chapter 3, Problem 3.60PAE
Textbook Problem
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## 3.60 Copper can have improved wear resistance if alloyed with ceramic alumina, A12O3. If a copper alloy has 8.5 wt% A12O3,what is its composition in mol%?

Interpretation Introduction

Interpretation:

Mol % of the elements present in alloy are calculated

Concept Introduction:

Mol % are calculated using the formula

% moles of element = molesofelementtotalmoles×100

To determine:

Copper alloy has 8.5 wt% Al2O3, what is its composition in mol%?

### Explanation of Solution

Assume the total weight of the alloy is 100 g

Wt % of Al2O3 = 8.5 % which means that Al2O3 is 8.5 g in the 100 g of the sample

Weight of copper = 100-8.5= 91.5 g

Molar mass of Cu= 63.05 g/mol

Molar mass of Al2O3 = 102 g/mol

Moles = givenmass(g)molarmass

Moles of Cu= 91.5g63.5g/mol=1

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