1) (Theaverage temperature at an altitude of 20

kmis 220 K.)

What is the average speed in m/sof an N2molecule at this altitude?

2) Traffic on the German autobahns reaches speeds of up to230

km/h.

At what temperature

(?C)do oxygen molecules have this same average speed?

3) An unknown gas is found to diffuse through a porous membrane 2.92times more slowly than

H2.

What is the molecular mass of the gas?

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Beverley SmithLv2

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An unknown gas is found to diffuse through a porous membrane 2.92 times more slowly than H₂. What is the molecular mass of the gas?

turquoisewolf786

An unknown gas is found to diffuse through a porous membrane 2.92 times more slowly than H₂. What is the molecular mass of the gas?

turquoisewolf786

1.Effusion is a process in which a gas escapes from a container through a small opening into a vacuum. In a pair of experiments, a sample of tetrafluoroethylene, C2F4, effuses at a rate of 4.6 Ã 10-6 mol/h and an unknown gas effuses at a rate of 4.0Ã10-6 mol/h. Identify the unknown gas. 2.Molecules in a sample of a gas move at a variety of speeds. Molecular speed can be described by the root-mean-square speed of the gas, which is the square root of the average of the squares of the speeds of all the gas molecules. What is the rms speed of a sample of CO2 at 69.99 Â°C, in m/s? 3.Nitrogen monoxide is a pollutant commonly found in smokestack emissions. One way to remove it is to react it with ammonia. 4NH3(g) + 6NO(g) â 5N2(g) + 6H2O(â) How many liters of ammonia are required to change 41.3 L of nitrogen monoxide to nitrogen gas? Assume 100% yield and that all gases are measured at the same temperature and pressure. 4.A 1.78-g sample of an unknown gas has a volume of 884 mL and a pressure of 968 mmHg at 57.1 Â°C. Calculate the molar mass of this compound.

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