Chapter 3.9, Problem 1.2ACP

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

Chapter
Section

### Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

# What is the percent by mass of each element in YBCO when x = 0.07?

Interpretation Introduction

Interpretation:

The percentage mass of YBa2Cu3O7-X(YBCO) should be calculated.

Concept introduction:

The mass percent can be calculated by using following formula,

Masspercent =Massoftheelementmass of the compound×100

Explanation

â€‚Â TheÂ givenÂ compoundÂ isÂ YBa2Cu3O7-X(YBCO)whereÂ x=Â 0.007,Â therefore,Â TheÂ givenÂ compoundÂ isÂ YBa2Cu3O6.93(YBCO)TheÂ Molarâ€‰massâ€‰ofâ€‰â€‰Â YBa2Cu3O6.93(YBCO)â€‰=â€‰664.986Molarâ€‰massâ€‰ofâ€‰Yâ€‰=â€‰88.90Molarâ€‰massâ€‰ofâ€‰bariumÂ =â€‰137.32therefore,Â 2Â molesÂ ofÂ â€‰bariumÂ =â€‰2Ã—137.32=Â 274.66Molarâ€‰massâ€‰ofâ€‰copperÂ =â€‰63.543Â molesÂ ofÂ â€‰copperâ€‰=â€‰3Ã—63.54=â€‰190.62Molarâ€‰massâ€‰ofâ€‰oxygen=â€‰15.996.93Â molesÂ ofÂ â€‰oxygenâ€‰=â€‰6.93Ã—15.99=â€‰110.8Massâ€‰percentÂ =Massâ€‰ofâ€‰theâ€‰elementâ€‰massÂ ofÂ theÂ compoundÃ—100Massâ€‰percentâ€‰ofâ€‰YÂ =88

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