39. (a) The root-mean-square speed is given by rms3vRTM=. See Eq. 19-34. The molar mass of hydrogen is 2.02 ×10–3kg/mol, so ()()3rms33 8.31J mol K 4000K7.0 10 m s.2.02 10 kg molv−⋅==××(b) When the surfaces of the spheres that represent an H2molecule and an Ar atom are touching, the distance between their centers is the sum of their radii: d = r1+ r2= 0.5 ×10–8cm + 1.5 ×10–8cm = 2.0 ×10–8cm. (c) The argon atoms are essentially at rest so in time
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