   Chapter 3.9, Problem 1.2ACP

Chapter
Section
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

The given compound is YBa2Cu3O7-X(YBCO)where x= 0.007, therefore, The given compound is YBa2Cu3O6.93(YBCO)The Molarmassof YBa2Cu3O6.93(YBCO)=664.986MolarmassofY=88.90Molarmassofbarium =137.32therefore, 2 moles of barium =2×137.32= 274.66Molarmassofcopper =63.543 moles of copper=3×63.54=190.62Molarmassofoxygen=15.996.93 moles of oxygen=6.93×15.99=110.8Masspercent =Massoftheelementmass of the compound×100MasspercentofY =88

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