Question

The temperature of H2 at which the rms velocity of its molecules is seven times the rms velocity of the molecules of nitrogen at 300K is?

(a) 2100K

(b) 1700K

(c) 1350K

(d) 1050K

Answer 1

Right answer is (d) 1050K

To explain I would say: vrms=√(3RT/M)

v1/v2 =√((T1 M2)/(T2 M1 ))

V(H2)/V(N2) =√((T(H2)×28)/(300×2))=7

T(H2)=(49×600)/28=1050K.