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Ch.6 - Gases
Tro - Chemistry: A Molecular Approach 6th Edition
Tro6th EditionChemistry: A Molecular ApproachISBN: 9780137832217당신이 사용하는 게 아니라요?교과서 변경
모든 교과서Tro 6th EditionCh.6 - Gases문제 74
6장, 문제 74

What is the mole fraction of oxygen gas in air (see Table 6.3)? What volume of air contains 20.0 g of oxygen gas at 273 K and 1.00 atm?

검증된 단계별 안내
1
Identify the mole fraction of oxygen gas in air from Table 6.3. Typically, air is composed of approximately 21% oxygen by volume.
Convert the mass of oxygen gas (20.0 g) to moles using the molar mass of oxygen (O_2), which is approximately 32.00 g/mol.
Use the ideal gas law, PV = nRT, to find the volume of oxygen gas. Here, P is the pressure (1.00 atm), V is the volume, n is the number of moles of oxygen, R is the ideal gas constant (0.0821 L·atm/mol·K), and T is the temperature (273 K).
Rearrange the ideal gas law to solve for volume (V): V = nRT/P.
Substitute the values for n, R, T, and P into the equation to calculate the volume of air that contains 20.0 g of oxygen gas.

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주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

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. For example, in air, the mole fraction of oxygen can be calculated by dividing the moles of oxygen by the total moles of all gases present.
추천 영상:
가이드 코스
00:36
Mole Fraction Formula

Ideal Gas Law

The Ideal Gas Law is a fundamental equation in chemistry that relates the pressure, volume, temperature, and number of moles of a 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 allows us to calculate the volume of gas under specific conditions, such as the volume of air containing a certain mass of oxygen.
추천 영상:
가이드 코스
01:15
Ideal Gas Law Formula

Standard Temperature and Pressure (STP)

Standard Temperature and Pressure (STP) is a reference point used in gas calculations, defined as 0 degrees Celsius (273 K) and 1 atmosphere of pressure. At STP, one mole of an ideal gas occupies a volume of 22.4 liters. This concept is crucial for determining the volume of gases in various conditions, including calculating how much air is needed to contain a specific mass of oxygen.
추천 영상:
가이드 코스
01:08
Standard Temperature and Pressure
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