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Calculate the rms speed in cm/s at 25^(@)C at a free electron and of a molecule of UF_(6). (H = 1 , U = 238, F = 19) |
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Answer» Solution :Mass of electron on atomic wt. scale is 1/1837 amu `THEREFORE` mass of 1 mole of electron `= (1)/(1837)g`. `R = 8.314 xx 10^(7)` ergs/k/mole `T = 273 + 25 = 298 K`. We have, `C = sqrt((3RT)/(M)) = sqrt((3 xx 8.314 xx 10^(7) xx 298)/(1//1837))` `therefore` rms speed of an electrons `1.16 xx 10^(7)` cm/s. To calculate rms spd. of `UF_(6)`, put `M = (238 + 6 xx 19)` |
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