Calculate the mass of nitrogen dissolved at room temperature in an 80.0-L home aquarium, assuming a total pressure of 1.0 atm and a mole fraction for nitrogen of 0.78.

Verified step by step guidance

Identify the relevant law: Use Henry's Law, which states that the solubility of a gas in a liquid is directly proportional to the partial pressure of the gas above the liquid.

Calculate the partial pressure of nitrogen: Multiply the total pressure by the mole fraction of nitrogen, i.e., \( P_{\text{N}_2} = 1.0 \text{ atm} \times 0.78 \).

Use Henry's Law to find the concentration of nitrogen: \( C = k_H \times P_{\text{N}_2} \), where \( k_H \) is the Henry's Law constant for nitrogen at room temperature.

Determine the volume of water in the aquarium: Since the aquarium is 80.0 L, assume this is the volume of water available for dissolving nitrogen.

Calculate the mass of nitrogen: Use the concentration from Henry's Law and the volume of water to find the moles of nitrogen, then convert moles to mass using the molar mass of nitrogen (28.02 g/mol).

Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Gas Solubility

Gas solubility refers to the amount of gas that can dissolve in a liquid at a given temperature and pressure. This is influenced by factors such as the nature of the gas, the solvent, and the temperature. For gases, solubility often increases with pressure, following Henry's Law, which states that the amount of gas dissolved is proportional to its partial pressure above the liquid.

Mole Fraction

Mole fraction is a way of expressing the concentration of a component in a mixture. It is defined as the ratio of the number of moles of a specific component to the total number of moles of all components in the mixture. In this context, the mole fraction of nitrogen indicates its proportion in the gas phase, which helps in calculating the partial pressure and subsequently the amount of nitrogen that can dissolve in the aquarium water.

Ideal Gas Law

The Ideal Gas Law is a fundamental equation in chemistry that relates the pressure, volume, temperature, and number of moles of an ideal gas. It is expressed as PV = nRT, where P is pressure, V is volume, n is the number of moles, R is the ideal gas constant, and T is temperature in Kelvin. This law is essential for calculating the number of moles of nitrogen in the aquarium based on the given pressure and volume, which can then be used to determine the mass of nitrogen dissolved.

Recommended video:

Guided course

01:15

Ideal Gas Law Formula

Related Practice

Textbook Question

Scuba divers breathing air at increased pressure can suffer from oxygen toxicity—too much oxygen in their bloodstream— when the partial pressure of oxygen exceeds about 1.4 atm. What happens to the amount of oxygen in a diver's bloodstream when he or she breathes oxygen at elevated pressures? How can this be reversed?

Textbook Question

An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the molarity of the solution. (Assume a density of 1.08 g/mL for the solution.)

Textbook Question

An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the molality of the solution. (Assume a density of 1.08 g/mL for the solution.)

Textbook Question

An aqueous NaCl solution is made using 112 g of NaCl diluted to a total solution volume of 1.00 L. Calculate the mass percent of the solution. (Assume a density of 1.08 g/mL for the solution.)