Freon-12 CF2Cl2 has been widely used in air conditiong systems, is consisdered a threat to the ozone layer in the stratosphere. Calculate the root-mean-square velocity of Freon-12 molecules in the lower stratosphere where the temp is -65 degrees C.
2006-11-29 04:08:03 · 2 answers · asked by lucid_dreams6 1 in Science & Mathematics ➔ Chemistry
The equation to calculate the root mean square velocity is:
u = square root (3RT/M)
where u is the rms velocity, R is the gas constant (in units of J/mol K), T is the Kelvin temperature and M is the molar mass (in kg/mol).
You should be able to calculate that from this equation.
2006-11-29 04:21:18 · answer #1 · answered by hcbiochem 7 · 0⤊ 0⤋
Vrms = [(3RT)/(M)] ^ (1/2)
R = 8.3145 J/Kmol
T = temp (K)
M = Molar Mass Kg/mol
-65 *C + 273 K = 208 K
M = 121 g/mol x (1 Kg)/(1000 g) = .121 Kg/mol
Vrms = [(3 x 8.3145 J/Kmol x 208 K)/(.121 Kg/mol)] ^ (1/2)
Vrms = 207.07 m/s
Vrms = 210 m/s (sig figs)
Remember, 1 J = 1 Kg m^2 s^-2
2006-11-29 12:25:01 · answer #2 · answered by VZ 2 · 0⤊ 0⤋