Skip to main content
Ch.2 - Atoms, Molecules, and Ions
Brown - Chemistry: The Central Science 14th Edition
Brown14th EditionChemistry: The Central ScienceISBN: 9780134414232Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoBrown 14th EditionCh.2 - Atoms, Molecules, and IonsProblema 2a
Capitolo 2, Problema 2a

The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are 293Nv, and the blue spheres are 295Nv. (a) Assuming that this sample is a statistically representative sample of the element, calculate the percent abundance of each element.
Diagram showing 20 atoms of nevadium: red spheres for 293Nv and blue for 295Nv.

Guida verificata passo dopo passo
1
Count the total number of atoms in the diagram. This will be the sum of red and blue spheres.
Count the number of red spheres (293Nv) in the diagram.
Count the number of blue spheres (295Nv) in the diagram.
Calculate the percent abundance of 293Nv by dividing the number of red spheres by the total number of atoms and then multiplying by 100.
Calculate the percent abundance of 295Nv by dividing the number of blue spheres by the total number of atoms and then multiplying by 100.

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.
Durata del video:
2m

Concetti chiave

Ecco i concetti essenziali che devi comprendere per rispondere correttamente alla domanda.

Isotopes

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons, resulting in different atomic masses. For example, nevadium (Nv) has two isotopes: 293Nv and 295Nv. Understanding isotopes is crucial for calculating their relative abundances in a sample.
Video consigliato:
Percorso guidato
04:36
Isotopes

Percent Abundance

Percent abundance refers to the proportion of each isotope of an element present in a sample, expressed as a percentage. To calculate percent abundance, divide the number of atoms of each isotope by the total number of atoms and multiply by 100. This concept is essential for determining the composition of the nevadium sample in the question.
Video consigliato:
Percorso guidato
5:41
Calculating Abundance Example

Statistical Representation

A statistically representative sample accurately reflects the characteristics of the larger population from which it is drawn. In this context, assuming the sample of 20 nevadium atoms is representative allows for reliable calculations of percent abundance. This concept ensures that the results can be generalized to the entire element rather than just the sample.
Video consigliato:
Percorso guidato
02:32
Main Group Elements Valence Electrons
Pratica correlata
Domanda del libro di testo

A charged particle moves between two electrically charged plates, as shown here.

(a) What is the sign of the electrical charge on the particle?

689
views
Domanda del libro di testo

The following diagram is a representation of 20 atoms of a fictitious element, which we will call nevadium (Nv). The red spheres are 293Nv, and the blue spheres are 295Nv. (b) If the mass of 293Nv is 293.15 u and that of 295Nv is 295.15 u, what is the atomic weight of Nv?

511
views
1
rank
Domanda del libro di testo

Four of the boxes in the following periodic table are colored. Which of these are metals and which are nonmetals?

372
views
Domanda del libro di testo

Does the following drawing represent a neutral atom or an ion?

1280
views