Problem: Consider the following drawing.If curves A and B refer to two different gases, He and O2 at the same temperature, which curve corresponds to He?

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We are asked which curve corresponds to He.


Molar mass He = 4.003 g/mol

Molar mass O2 = 32 g/mol


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Problem Details

Consider the following drawing.

A graph shows fraction of molecules versus molecular speed for gases A and B. Gas A peaks higher and to the left of gas B. The x axis is molecular speed and the y axis is fraction of molecules (both axes are unscaled). Gas A rises to a peak about two-thirds of the way up the y axis with the peak at about one quarter the length of the x axis. Gas B rises to a broad, lower peak about one third of the way up the y axis and about halfway across the x axis.

If curves A and B refer to two different gases, He and O2 at the same temperature, which curve corresponds to He?

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