1) Ozone is depleted in the stratosphere by chlorine from CF 3 Cl according to t

Question

1) Ozone is depleted in the stratosphere by chlorine from CF3Cl according to the set of equations:

What total volume of ozone at a pressure of 24.9 mmHg and a temperature of 238 K is destroyed when all of the chlorine from 13.4 g of CF3Cl goes through ten cycles of the above reactions?
_____ L

2) Calculate the root mean square velocity and kinetic energy of Ne, CO2, and O2 at 279 K.

Which gas has the greatest velocity?

NeCO2    

O2

All three have the same velocity.

The greatest kinetic energy?

NeCO2    

O2

All three have the same kinetic energy.

The greatest effusion rate?

NeCO2    

O2

All three have the same effusion rate.

3) A sample of CH4 effuses from a container in 41 seconds. How long would it take the same amount of gaseous N2O to effuse from the same container under identical conditions?
_____ s

CF3Cl + UV light CF3 + Cl Cl + O3 ClO + O2 O3 + UV light O2 + O ClO + O Cl + O2

Explanation / Answer

1)

pressure P = 24.9 mmHg = 0.0328 atm

temperature T = 238 K

mass = 13.4 g

molar mass CF3Cl = 104.5 g/mol

moles of CF3Cl = mass / molar mass

                          = 13.4 / 104.5

                          = 0.128

PV = nRT

0.0328 x V = 0.128 x 0.0821 x 238

V = 76.25 L

volume = 76.25 L

2)

molar mass of O2 = 32 g/mol

molar mass of Ne = 20.2 g/mol

molar mass of Co2 = 44 g/mol

(a) Which gas has the greatest velocity?

      Ne (lower molar mass greater velocity)

(b) The greatest kinetic energy?

     Ne (lower molar mass greater KE)

(c) The greatest effusion rate?

Ne (lower molar mass greater effusion rate)

3) molar mass of CH4 = 16 g/mol = 1

molar mass of N2O = 44 g /mol =2

r1 / r2 = t2 / t1

sqrt (M2/M1) = t2 / t1

sqrt (44 / 16) = t2 / 41

t2 = 70 sec

effusion of N2O = 70 sec

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