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Calculate the  speed of H2 molecules at T = 33 K on the surface of Triton. The molecular weight of H2 is 2.0159 amu.

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Mass of H(m) = 2.0159/(6.022 x 1023) = 0.3347 x 10-23g

= 0.3347 x 10-26kg

vm = (3KT/m)1/2

vm = ((3 x 1.38 x 10-23 x 33)/(0.3347 10-26)1/2 = (408.18 x 103)1/2

vm = 638.8m/s = 0.638km/s

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