Chapter 3.9, Problem 1.5ACP

### 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

# The percentage of oxygen in YBCO is adjusted by heating it in the presence of elemental oxygen. What mass of oxygen is required to convert 1.00 g YBa2Cu3O6.50 to YBa2Cu3O6.93?

Interpretation Introduction

Interpretation:

The mass of oxygen required to convert 1.00gYBa2Cu3O6.50 to YBa2Cu3O6.93 should be determined.

Concept introduction:

The number moles can be calculated by using following formula,

Numberofmoles =massmolarmass

Explanation

â€‚Â TheÂ givenÂ compoundÂ isÂ YBa2Cu3O6.5(YBCO)TheÂ Molarâ€‰massâ€‰ofâ€‰â€‰Â YBa2Cu3O6.5(YBCO)â€‰=â€‰658.126Molarâ€‰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€‰15.996.5Â molesÂ ofÂ â€‰oxygenâ€‰=â€‰6.93Ã—15.99=â€‰103.935Numberâ€‰ofâ€‰molesÂ =massâ€‰molarâ€‰massNumberâ€‰ofâ€‰molesÂ (YBa2Cu3O6.5)Â =massâ€‰molarâ€‰massNumberâ€‰ofâ€‰molesÂ (YBa2Cu3O6.5)Â =1658.126Numberâ€‰ofâ€‰molesÂ (YBa2Cu3O6

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