Skip to main content
Ch.6 - Gases
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217Non è quello che usi tu?Cambia libro di testo
Tutti i libri di testoTro 6th EditionCh.6 - GasesProblema 139
Capitolo 6, Problema 139

A gas mixture contains 75.2% nitrogen and 24.8% krypton by mass. What is the partial pressure of krypton in the mixture if the total pressure is 745 mmHg?

Guida verificata passo dopo passo
1
Convert the percentage by mass of krypton to a mole fraction. Assume a sample size of 100 g for simplicity, which means you have 24.8 g of krypton.
Calculate the number of moles of krypton using its molar mass (approximately 83.8 g/mol).
Calculate the number of moles of nitrogen using its molar mass (approximately 28.0 g/mol) from the remaining mass (75.2 g of nitrogen).
Determine the total number of moles in the mixture by adding the moles of krypton and nitrogen.
Calculate the mole fraction of krypton by dividing the moles of krypton by the total moles in the mixture, then use the mole fraction to find the partial pressure of krypton by multiplying it by the total pressure (745 mmHg).

Risposta video verificata per un problema simile:

Questa soluzione video è stata consigliata dai nostri tutor come utile per risolvere questo problema.

Concetti chiave

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

Dalton's Law of Partial Pressures

Dalton's Law states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of each individual gas. Each gas's partial pressure is proportional to its mole fraction in the mixture. This principle is essential for calculating the contribution of each gas to the total pressure.
Video consigliato:
Percorso guidato
00:27
Dalton's Law and Partial Pressure

Mole Fraction

The mole fraction is a way of expressing the concentration of a component in a mixture. It is calculated by dividing the number of moles of a specific gas by the total number of moles of all gases in the mixture. In this context, the mole fraction of krypton can be derived from its mass percentage and the molar masses of nitrogen and krypton.
Video consigliato:
Percorso guidato
00:36
Mole Fraction Formula

Ideal Gas Law

The Ideal Gas Law relates the pressure, volume, temperature, and number of moles of a gas through the equation PV = nRT. While this question primarily focuses on partial pressures, understanding the Ideal Gas Law provides a foundational context for how gases behave under various conditions, which can be useful for more complex calculations involving gas mixtures.
Video consigliato:
Percorso guidato
01:15
Ideal Gas Law Formula
Pratica correlata
Domanda del libro di testo

A gas mixture composed of helium and argon has a density of 0.670 g/L at a 755 mmHg and 298 K. What is the composition of the mixture by volume?

978
views
Domanda del libro di testo

A sample of N2O3(g) has a pressure of 0.017 atm. The temperature (in K) is doubled and the N2O3 undergoes complete decomposition to NO2(g) and NO(g). Find the total pressure of the mixture of gases assuming constant volume and no additional temperature change.

1332
views