Problem: Consider the following gases, all at STP: Ne, SF6, N2, CH4.Which one has the highest root-mean-square molecular speed at a given temperature?

FREE Expert Solution

root mean square speed (μrms)

μrms=3RTM

µrms = rms speed,
R = 8.314 J/(mol·K)
T = temperature, K
M = molar mass, kg/mol


Based on the equation for μrms, 3 and R are constants. All of the gases are at the same temperature (STP). The only difference the gases have is their molar masses (M).

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Problem Details

Consider the following gases, all at STP: Ne, SF6, N2, CH4.

Which one has the highest root-mean-square molecular speed at a given temperature?

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