Chapter 7.6, Problem 1.6ACP

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

Neodymium is commonly used in magnets, usually as Nd2Fe14B. (Neodymium is combined with other elements to protect it from air oxidation.) Determine the mass percentage of neodymium in Nd2Fe14B.

Interpretation Introduction

Interpretation:

The mass percentage of given Neodymium (Nd2Fe14B) compound has to be calculated.

Concept Introduction:

Mass percentage: This term used as a way of expressing a concentration (or) way of describing component in a mixture.

For example the calculation method the mass percentage (or) weight percent of solution you must divide the mass of the solute by the mass of the solution, both the solute and the solvent together and them multiply by 100 to change into percentage.

Let us consider the mass percentage formula.

MassPercent=gramsofsolutegramsofsolution×100

Explanation

The mass percentage formula as shown below

Massâ€‰Percentâ€‰=massâ€‰ofâ€‰theâ€‰elementÂ presentâ€‰inâ€‰oneâ€‰moleâ€‰ofâ€‰theÂ compoundmassâ€‰ofâ€‰oneâ€‰moleâ€‰ofâ€‰compoundÃ—â€‰100Â -----------[1]

The total mass value of Neodymium (Nd) atoms= 144.242 (each atom value)

Given Nd2Fe14B compound having two (Nd) atoms to be found= NdÃ—2=2Nd

TheÂ molarÂ massÂ valueÂ Â ofÂ (Nd)Â neodyiumÂ Â moleculeâ€‰=1081.13â€‰g/molTheÂ percentÂ ofÂ â€‰%Â (Nd)â€‰=(2)â€‰(144.24â€‰g/mol)1081.13â€‰g/molâ€‰Ã—100â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰â€‰x

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