Molecular Speeds: At what temperature is the rms speed of hydrogen molecules, H2, which have a molecular weight of 2.02 g/mole, equal to 2.0 km/s? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol.
A. 17°C
B. 34°C
C. 51°C
D. 68°C
E. 72°C
Answer: C
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