v = sqrt (k*T/M)
here : T is temperature in Kelvin
M is molar mass
K is constant
If we take ratio, above expression becomes
v(SO2)/v(NO2) = sqrt (M(NO2)/M(SO2))
we have:
M(SO2) = 64.07 g/mol
M(NO2) = 46.01 g/mol
v(SO2)/v(NO2) = sqrt (46.01/64.07)
v(SO2)/v(NO2) = sqrt (0.7181)
v(SO2)/v(NO2) = 0.8474
v(SO2)/395.0 = 0.8474
v(SO2) = 335 m/s
Answer: 335 m/s
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