RATE OF REACTION
Trichloroethylene (TCE) is an example of a volatile organic compound. Its bimolecular reaction with OH has k = 2.3×10-12 cm3 molecule-1 s-1 at 300 K. Estimate the atmospheric lifetime of TCE if the average concentration of OH remains fairly constant at 5.0×106 molecules/cm3.
Homework Answers
9. CH3Br reacts with OH with a room temperature rate constant of 2.9 x 10-14 cm3 molecule-1 s-1. ...
9. CH3Br reacts with OH with a room temperature rate constant of 2.9 x 10-14 cm3 molecule-1 s-1. (a) What is the lifetime of methyl bromide with respect to reaction with OH at a global mean concen tration of 5 x 105 molecules cm-3? (b) Colman et al. (1998) report an atmospheric lifetime of 0.8 0.1 years for methyl bromide. Since it is also taken up by soils and oceans, what must the lifetime with respect to uptake by soils...
18) Freon-134a (C2F4H2) is a compound used as a refrigerant & in products such /12) as...
18) Freon-134a (C2F4H2) is a compound used as a refrigerant & in products such /12) as "Dust-Off. It reacts with OH very slowly with a rate constant (koH) of 4.60x 10-15 cm3 molecule s1 at 298K a) If you assume [OH] -1.00x106 molecules cm3, what is the lifetime of CFC-11 in years? (Find in seconds and then convert to years using 1 year 365 days)
Methane is a greenhouse gas and it is predicted to have a large global warming impact....
Methane is a greenhouse gas and it is predicted to have a large global warming impact. Methane is primarily removed by reaction with hydroxyl radical (OH). OH + CH4 → H2O + CH3 Its activation energy is determined to be 27.2 kJ/mole and rate constant for kch4= 4.75x10-14 molecule cm sec1 at 0.00 °C. Assuming typical OH concentration in troposphere is 1.0x106 molecules cm A. Determine the atmospheric lifetime of CH4 at 0 °C B. Determine the rate constant at...
6.11. Stripping of VOCs from groundwater with air. Groundwater at a rate of 1,500 gpm, containing...
6.11. Stripping of VOCs from groundwater with air. Groundwater at a rate of 1,500 gpm, containing three volatile organic compounds (VOCs), is to be stripped in a trayed tower witlh air to produce drinking water that will meet EPA standards. Rele- vant data are given below. Determine the minimum air flow rate in scfm (60°F, 1 atm) and the number of equilibrium stages required if an air flow rate of twice the minimum is used and the tower operates at...
For a reaction of compound A reaction with compound B, you discover that the rate law...
For a reaction of compound A reaction with compound B, you discover that the rate law = k[A]1 [B]1 . If the concentration of A is changed from 0.48 to 0.12, everything else remains constant, and the original rate was 1.0 M/s, then what will be the new rate in M/s?
The following reaction mechanisms we have discussed to some degree during class: (kA 0.12 s) (kB...
The following reaction mechanisms we have discussed to some degree during class: (kA 0.12 s) (kB 1.98x10-16 cm3 molecule1 s') (kc 3.23x10-17 cm3 molecule1 s-1) (kD 1.00x10-12 cm3 molecule s1) (A) HNO3 OH NO2 (B) СО + О СО2 (C) NO2+ O3 NO3O2 (D) 2NO2 N2O4 (E) 2NO H2 N20 + H2O 1. 2NO N2O2 (k1,f= 1.00x10-14 cm3 molecule1 s-1) (ki,r 1.00x10-2 s1) (k2 1.00x10-16 cm3 molecule s1) (kF 0.001 s1 2. N2O2 H2 N20H20 (F) O3 hv O2 +...
The rate law for a general reaction involving reactant A is given by the equation rate...
The rate law for a general reaction involving reactant A is given by the equation rate = k[A]?, where rate is the rate of the reaction, k is the rate constant, [A] is the concentration of reactant A, and the exponent 2 is the order of reaction for reactant A. What is the rate constant, k, if the reaction rate at 450.°C is 1.23x10-1 mol/L.s when the concentration of A is 0.220 mol/L? 1/Mos When heated to 75°C, 1 mole...
2. For reaction (E), write the expression for the steady-state concentration of N2O2, [N2O2]ss. What is...
2. For reaction (E), write the expression for the steady-state concentration of N2O2, [N2O2]ss. What is the steady-state concentration of N2O2 given a concentration of [NO] = 1 ppb and [H2] = 500 ppb? Solve for the production rate (molecules cms-1) of N20. Assume the number density of air molecules is 2.5x1019 molecules cm3. The following reaction mechanisms we have discussed to some degree during class: (A) HNO3 → OH + NO2 (ka = 0.12 s-1) (B) CO+O → CO2...
To understand how elementary steps make up a mechanism and how the rate law for an...
To understand how elementary steps make up a mechanism and how the rate law for an elementary step can be determined. Very often, a reaction does not tell us the whole story. For instance, the reaction NO2(g)+CO(g)→NO(g)+CO2(g)NO2(g)+CO(g)→NO(g)+CO2(g) does not involve a collision between an NO2NO2 molecule and a COCO molecule. Based on experimental data at moderate temperatures, this reaction is thought to occur in the following two steps: NO2(g)+NO2(g)→NO3(g)+NO(g)NO2(g)+NO2(g)→NO3(g)+NO(g) NO3(g)+CO(g)→CO2(g)+NO2(g)NO3(g)+CO(g)→CO2(g)+NO2(g) Each individual step is called an elementary step. Together, these...
The gas-phase reaction of NO with F2 to form NOF and F has an activation energy...
The gas-phase reaction of NO with F2 to form NOF and F has an activation energy of Ea = 6.30 kJ/mol and a frequency factor of A = 6.00×108 M−1⋅s−1 . The reaction is believed to be bimolecular: NO(g)+F2(g)→NOF(g)+F(g) Part A What is the rate constant at 641 ∘C ? Express your answer to three significant digits with the appropriate units. For compound units, place a multiplication dot between units (e.g. J⋅mol−1⋅K−1). Which of the following statements reasonably explains why...
9. CH3Br reacts with OH with a room temperature rate constant of 2.9 x 10-14 cm3 molecule-1 s-1. (a) What is the lifetime of methyl bromide with respect to reaction with OH at a global mean concen tration of 5 x 105 molecules cm-3? (b) Colman et al. (1998) report an atmospheric lifetime of 0.8 0.1 years for methyl bromide. Since it is also taken up by soils and oceans, what must the lifetime with respect to uptake by soils...
18) Freon-134a (C2F4H2) is a compound used as a refrigerant & in products such /12) as "Dust-Off. It reacts with OH very slowly with a rate constant (koH) of 4.60x 10-15 cm3 molecule s1 at 298K a) If you assume [OH] -1.00x106 molecules cm3, what is the lifetime of CFC-11 in years? (Find in seconds and then convert to years using 1 year 365 days)
Methane is a greenhouse gas and it is predicted to have a large global warming impact. Methane is primarily removed by reaction with hydroxyl radical (OH). OH + CH4 → H2O + CH3 Its activation energy is determined to be 27.2 kJ/mole and rate constant for kch4= 4.75x10-14 molecule cm sec1 at 0.00 °C. Assuming typical OH concentration in troposphere is 1.0x106 molecules cm A. Determine the atmospheric lifetime of CH4 at 0 °C B. Determine the rate constant at...
6.11. Stripping of VOCs from groundwater with air. Groundwater at a rate of 1,500 gpm, containing three volatile organic compounds (VOCs), is to be stripped in a trayed tower witlh air to produce drinking water that will meet EPA standards. Rele- vant data are given below. Determine the minimum air flow rate in scfm (60°F, 1 atm) and the number of equilibrium stages required if an air flow rate of twice the minimum is used and the tower operates at...
The following reaction mechanisms we have discussed to some degree during class: (kA 0.12 s) (kB 1.98x10-16 cm3 molecule1 s') (kc 3.23x10-17 cm3 molecule1 s-1) (kD 1.00x10-12 cm3 molecule s1) (A) HNO3 OH NO2 (B) СО + О СО2 (C) NO2+ O3 NO3O2 (D) 2NO2 N2O4 (E) 2NO H2 N20 + H2O 1. 2NO N2O2 (k1,f= 1.00x10-14 cm3 molecule1 s-1) (ki,r 1.00x10-2 s1) (k2 1.00x10-16 cm3 molecule s1) (kF 0.001 s1 2. N2O2 H2 N20H20 (F) O3 hv O2 +...
The rate law for a general reaction involving reactant A is given by the equation rate = k[A]?, where rate is the rate of the reaction, k is the rate constant, [A] is the concentration of reactant A, and the exponent 2 is the order of reaction for reactant A. What is the rate constant, k, if the reaction rate at 450.°C is 1.23x10-1 mol/L.s when the concentration of A is 0.220 mol/L? 1/Mos When heated to 75°C, 1 mole...
2. For reaction (E), write the expression for the steady-state concentration of N2O2, [N2O2]ss. What is the steady-state concentration of N2O2 given a concentration of [NO] = 1 ppb and [H2] = 500 ppb? Solve for the production rate (molecules cms-1) of N20. Assume the number density of air molecules is 2.5x1019 molecules cm3. The following reaction mechanisms we have discussed to some degree during class: (A) HNO3 → OH + NO2 (ka = 0.12 s-1) (B) CO+O → CO2...
Most questions answered within 3 hours.
-
Where is the error in this code sequence?
String s1 = "Hello";
String s2 = "ello";...
asked 10 months ago -
Financial data for Joel de Paris, Inc., for last year
follow:
Joel de Paris, Inc.
Balance...
asked 10 months ago -
Consider this reaction:
Al2(SO4)3 (aq)+ BaCl3
(aq) Al2Cl6 (aq)- +
3BaSO4(s) . What is the...
asked 10 months ago -
Suppose that Savneet is considering increasing her
recent random sample from 20 car rentals to 40...
asked 10 months ago -
Trucks arrive at an unloading terminal at an average rate of 120
per hour.
Trucks arrive...
asked 10 months ago -
Why are methanol and ethanol completely soluble in water while
octanol is not very little soluble....
asked 10 months ago -
A facilities manager at a university reads in a research report
that the mean amount of...
asked 10 months ago -
When the CuSO4 is rehydrated by adding water to the anhydrous
compound, is this an endothermic...
asked 10 months ago -
A ray of sunlight is passing from diamond into crown glass; the
angle of incidence is...
asked 10 months ago -
A block of mass 0.249 kg is placed on top of a light, vertical
spring of...
asked 10 months ago -
how do the kidneys compensate in the presences of acidosis
a) trigger hyperventilate
b) reserve acid...
asked 10 months ago -
Question 501 pts
The rental rate of capital to the firm increases. Which of the
following...
asked 10 months ago