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Ch.3 - Mass Relationships in Chemical Reactions
McMurry - Chemistry 8th Edition
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Tutti i libri di testoMcMurry 8th EditionCh.3 - Mass Relationships in Chemical ReactionsProblema 58a
Capitolo 3, Problema 58a

A sample that weighs 25.12 g contains 6.022⨉1023 particles. If 25.00% of the total number of particles are argon atoms and 75.00% are another element, what is the chemical identity of the other constituent?

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Determine the number of argon atoms by calculating 25.00% of 6.022\(\times\)10^{23} particles.
Calculate the number of particles of the other element by subtracting the number of argon atoms from the total number of particles.
Find the molar mass of argon (Ar) using the periodic table, which is approximately 39.95 g/mol.
Calculate the mass of argon in the sample using the number of argon atoms and Avogadro's number.
Subtract the mass of argon from the total mass of the sample to find the mass of the other element, then use the number of particles of the other element to determine its molar mass and identify it using the periodic table.

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Mole Concept

The mole is a fundamental unit in chemistry that represents a specific quantity of particles, typically atoms or molecules. One mole contains Avogadro's number, approximately 6.022 x 10^23 particles. This concept is essential for converting between the mass of a substance and the number of particles it contains, allowing chemists to relate macroscopic measurements to microscopic quantities.
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Mole Concept

Mass Percent Composition

Mass percent composition refers to the percentage by mass of each element in a compound. It is calculated by dividing the mass of the element in the sample by the total mass of the sample and multiplying by 100. Understanding mass percent is crucial for determining the proportions of different elements in a mixture, which aids in identifying unknown substances.
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Atomic Mass and Element Identification

Each element has a unique atomic mass, which is the weighted average mass of its isotopes. By knowing the total mass of a sample and the mass percent of its constituents, one can deduce the identity of unknown elements. In this case, the atomic mass of argon and the other element can be used to identify the second constituent based on the given mass and particle distribution.
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Atomic Mass
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