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Solution: A sample of neon effuses from a container in 77 seconds. The same amount of an unknown noble gas requires 157 seconds.Identify the second gas.

Problem

A sample of neon effuses from a container in 77 seconds. The same amount of an unknown noble gas requires 157 seconds.

Identify the second gas.

Solution

Recall: Graham's Law of Effusion allows us to compare the rate of effusion of two gases. Graham's Law states that the rate of effusion of a gas is inversely proportional to its molar mass.

This means that when comparing two gases:

Recall that rate = volume over time. This means:

Assuming that volumeNe = volumeunk, the equation simplifies to:

Plugging this into the original equation:

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