Calculate the rms speed of carbon dioxide molecules at STP. A. 12.4 m/s B. 155m/s C. 393 m/s D. 1.55 x 10^5 m/s?

1 Answer

  • RMS speed = Square root (3RT/M) where

    R = 8.314 kgm^2/s^2,

    T = Kelvin temperature

    M = molar mass in kg/mol

    For CO2 at STP:

    RMS speed = Square root (3 (8.314)273.15K / 0.04401 g/mol) = 393 m/s

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