The compound CF4 (87.97 g/mol) is present in the atmosphere at 78.5 ppt (trillion). Assuming this...
The compound CF4 (87.97 g/mol) is present in the atmosphere at
78.5 ppt (trillion). Assuming this is
a global average, what is the total amount of CF4 (in Tg) in the
atmosphere.
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The compound CF4 (87.97 g/mol) is present in the atmosphere at
78.5 ppt (trillion). Assuming this...
5.3307 g of Na2CrO4 (MW 161.97 g/mol) is dissolved in 1000.0 mL of water. Assuming the...
5.3307 g of Na2CrO4 (MW 161.97 g/mol) is dissolved in 1000.0 mL of water. Assuming the solution has a density of 1.00 g/mL, what is the concentration of Na (MW 22.9898 g/mol) in the solution in units of a) molarity (M)? Number b) parts per thousand (ppt)? Number ppt c) 25.0 mL of the solution is then diluted to a final volume of 500.0 mL. What is the concentration of Na* in the diluted solution in units of parts per...
An unknown amount of a compound with a molecular mass of 274.11 g/mol 274.11 g/mol is...
An unknown amount of a compound with a molecular mass of 274.11 g/mol 274.11 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 325 nm 325 nm is 0.523 0.523 in a 1.000 cm cuvet. The molar absorptivity for this compound at 325 nm 325 nm is ?...
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in...
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 343 nm is 0.456 in a 1.000 cm cuvette. The molar absorptivity for this compound at 343 nm is €343 = 5721 M-?cm-1. What is the concentration...
1 of 2 GEOL 3382/6334 Atmospheric Chemistry Problem Set #2 1. Methane (CH4) is emitted to...
1 of 2 GEOL 3382/6334 Atmospheric Chemistry Problem Set #2 1. Methane (CH4) is emitted to the atmosphere through natural and anthropogenic processes. The following table shows the most current understanding of the sources and sinks of CH4 a. Calculate the atmospheric burden of CHs in Tg (1 Tg 10g) in the troposphere with a global average mixing ratio of 1.782 ppmv. Tropospheric air has an average density of 0.71 kg m3. The Standard Atmosphere Calculator (http://www.digitaldutch.com/atmoscalc/) may be of...
An unknown amount of a compound with a molecular mass of 270.93 g/mol is dissolved in...
An unknown amount of a compound with a molecular mass of 270.93 g/mol is dissolved in a 10-mL volumetric flask. A 1.00-mL aliquot of this solution is transferred to a 25-mL volumetric flask and e water is added to dilute to the mark. The absorbance of this diluted solution at 339 nm is 0.517 in a 1 cm cuvette. The molar absorptivity for this compound at 339 nm is esso- 5835 M-1cm-1 (a) What is the concentration of the compound...
An unknown amount of a compound with a molecular mass of 284.04 g/mol is dissolved in...
An unknown amount of a compound with a molecular mass of 284.04 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 347 nm is 0.472 in a 1.000 cm cuvet. The molar absorptivity for this compound at 347 nm is ?347=6023 M−1cm−1. What is the concentration of the...
An unknown amount of a compound with a molecular mass of 259.45 g/mol is dissolved in...
An unknown amount of a compound with a molecular mass of 259.45 g/mol is dissolved in a 10-mL volumetric flask. A 1,00-mL aliquot of this solution is transferred to a 2 L volumetric flask and o the mark. The absorbance of this diluted solution at 347 nm is 0.468 in a 1 cm cuvette. The molar (a) What is the concentration of the compound in the cuvette? Number b) What is the concentration of the compound in the 10-ml flask?...
Compound Mol. Weight (g) mmol amount (in g or mL) melting point (°C) Density (g/mL) Ref....
Compound
Mol. Weight (g)
mmol
amount
(in g or mL)
melting point (°C)
Density
(g/mL)
Ref.
bromobenzene
157.01
4.00
0.628
n/a
1.491
1
magnesium powder
120.37
4.00
0.097
n/a
n/a
2
ethyl ether
74.12
n/a
5.00
n/a
0.706
3
benzophenone
182.22
3.8
0.692
47-51
n/a
4
triphenylmethanol
260.33
160-163
n/a
5
5% HCl (aq.)
36.46
n/a
2.00
n/a
n/a
6
With this information, what is the theoretical yield of
triphenylmethanol?
HO Br Mg MgBr ether ether bromobenzene benzophenone triphenylmethanol
2-Consider the reaction H2(g) + Br2(g)  
2-Consider the reaction H2(g) + Br2(g) 2 HBr (g⇌ ) where ΔHo = -36.4 kJ/mol. In one experiment, equal amounts in moles of H2(g) and Br2(g) were mixed in a 2.00 L chamber at 25 oC exerting a pressure P = 1.0 atm. After mixture reached equilibrium, partial pressure of H2 gas PH2 was measured using high sensitivity HVAC gauge recording, PH2 = 5x10-4 Pa. For this equilibrium reaction, answer the following: (i)Calculate the total amount nT of gases...
9. The density of a gas is 2.2 g/L at 29°C and 0.966 bar. What is...
9. The density of a gas is 2.2 g/L at 29°C and 0.966 bar. What is its molar mass? (1 atm = 1.01325 bar) 10. Nitrox is a gas mixture used in scuba diving that contains a higher-than-normal level of oxygen and a lower-thannormal level of nitrogen. A lower amount of nitrogen reduces the risk of “the bends.” a. What percent of nitrogen and oxygen is present in the given nitrox tank? b. What is the partial pressure of each...
5.3307 g of Na2CrO4 (MW 161.97 g/mol) is dissolved in 1000.0 mL of water. Assuming the solution has a density of 1.00 g/mL, what is the concentration of Na (MW 22.9898 g/mol) in the solution in units of a) molarity (M)? Number b) parts per thousand (ppt)? Number ppt c) 25.0 mL of the solution is then diluted to a final volume of 500.0 mL. What is the concentration of Na* in the diluted solution in units of parts per...
An unknown amount of a compound with a molecular mass of 294.46 g/mol is dissolved in a 10 mL volumetric flask. A 1.00 mL aliquot of this solution is transferred to a 25 mL volumetric flask, and enough water is added to dilute to the mark. The absorbance of this diluted solution at 343 nm is 0.456 in a 1.000 cm cuvette. The molar absorptivity for this compound at 343 nm is €343 = 5721 M-?cm-1. What is the concentration...
1 of 2 GEOL 3382/6334 Atmospheric Chemistry Problem Set #2 1. Methane (CH4) is emitted to the atmosphere through natural and anthropogenic processes. The following table shows the most current understanding of the sources and sinks of CH4 a. Calculate the atmospheric burden of CHs in Tg (1 Tg 10g) in the troposphere with a global average mixing ratio of 1.782 ppmv. Tropospheric air has an average density of 0.71 kg m3. The Standard Atmosphere Calculator (http://www.digitaldutch.com/atmoscalc/) may be of...
An unknown amount of a compound with a molecular mass of 270.93 g/mol is dissolved in a 10-mL volumetric flask. A 1.00-mL aliquot of this solution is transferred to a 25-mL volumetric flask and e water is added to dilute to the mark. The absorbance of this diluted solution at 339 nm is 0.517 in a 1 cm cuvette. The molar absorptivity for this compound at 339 nm is esso- 5835 M-1cm-1 (a) What is the concentration of the compound...
An unknown amount of a compound with a molecular mass of 259.45 g/mol is dissolved in a 10-mL volumetric flask. A 1,00-mL aliquot of this solution is transferred to a 2 L volumetric flask and o the mark. The absorbance of this diluted solution at 347 nm is 0.468 in a 1 cm cuvette. The molar (a) What is the concentration of the compound in the cuvette? Number b) What is the concentration of the compound in the 10-ml flask?...
Compound
Mol. Weight (g)
mmol
amount
(in g or mL)
melting point (°C)
Density
(g/mL)
Ref.
bromobenzene
157.01
4.00
0.628
n/a
1.491
1
magnesium powder
120.37
4.00
0.097
n/a
n/a
2
ethyl ether
74.12
n/a
5.00
n/a
0.706
3
benzophenone
182.22
3.8
0.692
47-51
n/a
4
triphenylmethanol
260.33
160-163
n/a
5
5% HCl (aq.)
36.46
n/a
2.00
n/a
n/a
6
With this information, what is the theoretical yield of
triphenylmethanol?
HO Br Mg MgBr ether ether bromobenzene benzophenone triphenylmethanol
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