Question

To what temperature should the hydrogen at room temperature (27°C) be heated at constant pressure so that the R.M.S. velocity of its molecules becomes double of its previous value

• A. 1200C
• B. 927C
• C. 600C
• D. 108C

Answer 1

Answer: (B)

927C

Answer 2

$v_{rms} \propto \sqrt{T}$Ž$\frac{(v_{rms})_{2}}{(v_{rms})_{1}} = \sqrt{\frac{T_{2}}{T_{1}}}$

Ž $2 = \sqrt{\frac{T_{2}}{300}}$Ž $T_{2} = 1200K = 927{^\circ}C$