   Chapter 3.9, Problem 1.1ACP

Chapter
Section
Textbook Problem

Use the following mass percentages to determine the value of x in a sample of La2-xBaxCuO4: %La = 63.43. %Ba = 5.085, %Cu = 15.69. and %0 = 15.80.

Interpretation Introduction

Interpretation:

The value of x should be identified from the sample of La2-xBaxCuO4.

Concept introduction:

The number moles can be calculated by using following formula,

Numberofmoles =massmolarmass

Explanation

The given compound is La2-xBaxCuO4Molarmassoflanthanam=138.90Molarmassofbarium =137.32Molarmassofcopper=63.54Molarmassofoxygen=15.99Numberofmoles =massmolarmassNumberofmoles of lanthanam =63.43138.90Numberofmoles of lanthanam =0.456Numberofmoles of barium =5.085137.32=0.037Numberofmoles of copper =15.6963.54=0.246Numberofmoles of oxygen =15

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