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Ch.10 - Gases: Their Properties & Behavior
McMurry - Chemistry 8th Edition
McMurry8th EditionChemistryISBN: 9781292336145당신이 사용하는 게 아니라요?교과서 변경
모든 교과서McMurry 8th EditionCh.10 - Gases: Their Properties & Behavior문제 136
10장, 문제 136

Assume that you take a flask, evacuate it to remove all the air, and find its mass to be 478.1 g. You then fill the flask with argon to a pressure of 2.15 atm and reweigh it. What would the balance read in grams if the flask has a volume of 7.35 L and the temperature is 20.0 °C?

검증된 단계별 안내
1
Convert the temperature from Celsius to Kelvin using the formula: \( T(K) = T(°C) + 273.15 \).
Use the ideal gas law \( PV = nRT \) to find the number of moles of argon gas. Rearrange the formula to solve for \( n \): \( n = \frac{PV}{RT} \).
Substitute the known values into the ideal gas law equation: \( P = 2.15 \text{ atm} \), \( V = 7.35 \text{ L} \), \( R = 0.0821 \text{ L atm K}^{-1} \text{ mol}^{-1} \), and \( T \) in Kelvin.
Calculate the mass of argon using the number of moles obtained and the molar mass of argon (approximately 39.95 g/mol): \( \text{mass} = n \times \text{molar mass} \).
Add the mass of the argon gas to the mass of the empty flask to find the total mass: \( \text{total mass} = \text{mass of flask} + \text{mass of argon} \).

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.
영상 길이:
7m

주요 개념

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

Ideal Gas Law

The Ideal Gas Law relates the pressure, volume, temperature, and number of moles of a gas through the equation PV = nRT. This law is essential for calculating the amount of gas in a given volume and conditions, allowing us to determine how much argon is present in the flask when it is filled to a specific pressure and temperature.
추천 영상:
가이드 코스
01:15
Ideal Gas Law Formula

Molar Mass of Argon

Argon is a noble gas with a molar mass of approximately 39.95 g/mol. Knowing the molar mass is crucial for converting the number of moles of argon, calculated from the Ideal Gas Law, into grams, which is necessary for determining the total mass of the flask after it is filled with argon.
추천 영상:
가이드 코스
02:11
Molar Mass Concept

Mass Measurement and Buoyancy

When measuring the mass of the flask filled with argon, it is important to consider that the balance reads the total mass of the flask plus the gas. The buoyancy effect of the surrounding air is negligible in a vacuum, but understanding how mass is measured in different conditions helps ensure accurate calculations of the final mass after filling the flask.
추천 영상:
가이드 코스
02:52
Units of Radiation Measurement
관련 실천
교과서 질문

The apparatus shown consists of three temperature-jacketed 1.000-L bulbs connected by stopcocks. Bulb A contains a mixture of H2O(g), CO2(g), and N2(g) at 25 °C and a total pressure of 564 mm Hg. Bulb B is empty and is held at a temperature of -70 °C. Bulb C is also empty and is held at a temperature of -190 °C. The stopcocks are closed, and the volume of the lines connecting the bulbs is zero. CO2 sublimes at -78 °C, and N2 boils at -196 °C.

(b) How many moles of H2O are in the system?

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교과서 질문

The apparatus shown consists of three temperature-jacketed 1.000-L bulbs connected by stopcocks. Bulb A contains a mixture of H2O(g), CO2(g), and N2(g) at 25 °C and a total pressure of 564 mm Hg. Bulb B is empty and is held at a temperature of -70 °C. Bulb C is also empty and is held at a temperature of -190 °C. The stopcocks are closed, and the volume of the lines connecting the bulbs is zero. CO2 sublimes at -78 °C, and N2 boils at -196 °C.

(a) The stopcock between A and B is opened, and the system is allowed to come to equilibrium. The pressure in A and B is now 219 mm Hg. What do bulbs A and B contain?

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교과서 질문

Pakistan's K2 is the world's second-tallest mountain, with an altitude of 28,251 ft. Its base camp, where climbers stop to acclimate, is located about 16,400 ft above sea level. (a) Approximate atmospheric pressure P at different altitudes is given by the equation P = e-h/7000, where P is in atmospheres and h is the altitude in meters. What is the approximate atmospheric pressure in mm Hg at K2 base camp? (b) What is the atmospheric pressure in mm Hg at the summit of K2?

832
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교과서 질문

Pakistan's K2 is the world's second-tallest mountain, with an altitude of 28,251 ft. Its base camp, where climbers stop to acclimate, is located about 16,400 ft above sea level. (c) Assuming the mole fraction of oxygen in air is 0.2095, what is the partial pressure of oxygen in mm Hg at the summit of K2?

520
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교과서 질문
When solid mercury(I) carbonate, Hg2CO3, is added to nitric acid, HNO3, a reaction occurs to give mercury(II) nitrate, Hg1NO322, water, and two gases A and B: Hg2CO31s2 + HNO31aq2¡ Hg1NO3221aq2 + H2O1l 2 + A1g2 + B1g2 (a) When the gases are placed in a 500.0-mL bulb at 20 °C, the pressure is 258 mm Hg. How many moles of gas are present?
595
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교과서 질문
A driver with a nearly empty fuel tank may say she is 'running on fumes.' If a 15.0-gallon automobile gas tank had only gasoline vapor remaining in it, what is the farthest the vehicle could travel if it gets 20.0 miles per gallon on liquid gasoline? Assume the average molar mass of molecules in gasoline is 105 g/mol, the density of liquid gasoline is 0.75 g/mL, the pressure is 743 mm Hg, and the temperature is 25 °C.
633
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