Skip to main content
Ch.3 - Chemical Reactions and Reaction Stoichiometry
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.3 - Chemical Reactions and Reaction StoichiometryProblema 30a
Capitolo 3, Problema 30a

(a) What is the mass, in grams, of one mole of 12C?

Guida verificata passo dopo passo
1
Understand that the mass of one mole of an element is its molar mass, which is numerically equal to the atomic mass of the element in atomic mass units (amu).
Recognize that the atomic mass of carbon-12 (\(^{12}\text{C}\)) is exactly 12 amu by definition.
Recall that one mole of any substance contains Avogadro's number of entities, which is approximately \(6.022 \times 10^{23}\) entities.
Since the atomic mass of \(^{12}\text{C}\) is 12 amu, the molar mass of \(^{12}\text{C}\) is 12 grams per mole.
Conclude that the mass of one mole of \(^{12}\text{C}\) is 12 grams.

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:
59s

Concetti chiave

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

Molar Mass

Molar mass is the mass of one mole of a substance, typically expressed in grams per mole (g/mol). It is numerically equivalent to the atomic or molecular weight of the substance in atomic mass units (amu). For example, the molar mass of carbon-12 (12C) is 12 g/mol, meaning one mole of carbon-12 weighs 12 grams.
Video consigliato:
Percorso guidato
02:11
Molar Mass Concept

Avogadro's Number

Avogadro's number, approximately 6.022 x 10²³, is the number of atoms, molecules, or particles in one mole of a substance. This constant allows chemists to convert between the number of particles and the amount of substance in moles, facilitating calculations in stoichiometry and chemical reactions.
Video consigliato:
Percorso guidato
02:11
Avogadro's Law

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. Carbon-12 is a stable isotope of carbon with 6 protons and 6 neutrons, and it is commonly used as a standard for defining the mole and molar mass in chemistry.
Video consigliato:
Percorso guidato
04:36
Isotopes
Pratica correlata
Domanda del libro di testo

(a) Write 'true' or 'false' for each statement. (d) A mole of NaCl(s) contains 2 moles of ions

867
views
Domanda del libro di testo

(a) Write 'true' or 'false' for each statement. (b) A mole of water has a mass of 18.0 g.

670
views
Domanda del libro di testo

(b) How many bromine atoms are present in one mole of 12C?

818
views
Domanda del libro di testo

Without doing any detailed calculations (but using a periodic table to give atomic weights), rank the following samples in order of increasing numbers of atoms: 0.50 mol H2O, 23 g Na, 6.0⨉1023 N2 molecules.

501
views
1
rank
Domanda del libro di testo

What is the mass, in kilograms, of an Avogadro's number of people, if the average mass of a person is 160 lb?

862
views
Domanda del libro di testo

(a) Write “true” or “false” for each statement. (c) The mass of 1 ammonia molecule is 17.0 g.