# Helium is found to diffuse four times more rapidly than an unknown gas. What is the approximate molar mass of the unknown gas?

You can start from any expression for the speed. The RMS speed is a fine choice:

Let's check mathematically.

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The approximate molar mass of the unknown gas is about 16 g/mol.

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When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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