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A La grand Guerre(D1) > Computation > Flashcards

Computation Flashcards

1
Q

17.1 Phychem
consider moist air at SATP and relative humidity is 85%
1. what is the mole fraction of water vapor
2. what is the molar mass of moist air

A
  1. 0.027

2. 28.547 g/mol

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2
Q 
17.2 Phychem
calculate the following given the following vapor pressure at different temperatures
42.5 deg C - 73.24 cm Hg
52.5 deg C - 74.53 cm Hg
58.5 deg C - 74.93 cm Hg
1. what is the experimental enthalpy of vaporization (kJ/mol)
A. -1.27 
B. 1.27
C. -5.08
D. 5.08
2. what is the normal boiling point of the liquid in degrees celsius ?
A. 68
B. 76 
C. 341
D. 349 
3. what is the experimental enthalpy of vaporization (kj/mol) if the vapor behaves as a real gas Z=0.95 
A. -1.21
B. 1.21 
C. -1.34 
D. 1.34
A

B
A
B

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3
Q 
17.3 Phychem
liquids 2-pentanone and 3-pentanone are mixed in 2:3 ratios. what is the pressure mmHg of the solution and fraction of 3-pentanone in the vapor phase at 25 degrees celsius
A. 36.03, 0.34 
B. 36.03, 0.61 
C. 36.60, 0.34 
D. 36.60, 0.61
A

D

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4
Q 
17.4 Phychem
at 3000 K and 1 Atm CO2 is 40% dissociated to CO and O2. according to the reaction to CO2(g) <=>CO(g) + O2(g) it's percentage dissociation when the pressure is increased to 2 atm is
A. 0.35
B. 0.335
C. 0.425
D. 0.375
A

B.

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5
Q 
17.5 Phychem
PCl5(g) dissociates into PCl3(g) and Cl2(g) when heated at 250 °C and 1 atm. if the density of the gas mixture at equilibrium is 4.4 g/L the fraction of PCl5(g) dissociated is
A. 0.103
B. 0.3 28
C. 0.725
D. 0.209
A

A

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6
Q 
17.6 Phychem
the dissociation constant for liquid water into hydrogen oxygen gas at 1227 °C is 1.9 x 10^-11 and it is 3.9 x 10^-19 power at 727 °C. the heat of reaction of the following reaction H2(g) + 1/2O2(g) <=> H2O(l) is 
A. -442 (kJ/mol)
B. -221 (kJ/mol)
C. 221 (kJ/mol)
D. 442 (kJ/mol)
A

A

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7
Q 
17.7 Phychem
Fe crystallizes in a body-centered cubic lattice. the density of iron is 7.86 g/cm^3 calculate the atomic radius of iron in angstrom 
A. 1.24
B. 2.48
C. 0.62
D. 2.02
A

A

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8
Q 
1.1 GenInorgChem
tungsten has a work function of 4.52 eV. what is the kinetic energy (j) of an ejected electron if the metal surface is irradiated by a 200 nm light?
A. 2.70E-19
B. 1.68E-19
C. 3.88E-19
D. 4.05E-19
A

A

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9
Q 
1.2 GenInorgChem
what is the activity (Ci) of a 5.0 mg radioactive Sr-90 with a half-life of 28.8 years?
A. 0.17
B. 0.31 
C. 0.69
D. 0.83
A

C

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10
Q

1.3 GenInorgChem
Convert the 0.01 M aqueous solution of soda niter to the following
1. Percentage weight
2. Molality

A
  1. 85

0. 01

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11
Q

1.4 GenInorgChem
Consider the endothermic reaction A(g) <=>B(g) +C(g). The Kc value is 0.68 and the initial concentrations of B and C are 0.5 M and 1.0 M, respectively at 25 °C.

1. What is the Kp value?
A. 0.028
B. 0.056
C. 17
D. 407
2. What is the equilibrium concentration of B (M)?
A. 0.24
B. 0.26
C. 0.43
D. 0.74
A

C

A

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12
Q 
1.5 GenInorgChem
what is the percentage of oxygen in vanadium oxide
A. 36
B. 40 
C. 44
D. 48
A

C

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13
Q 
1.6 GenInorgChem
a compound was subjected to analysis. it has been found that it is composed of 57.14% C, 6.16% H, 9.52 % N, and 27.18%  O. what is the empirical formula of the compound?
A. C7H9NO2
B. C7H9NO3
C. C14H18N2O5
D. C28H36N4O10
A

C

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14
Q 
1.7 GenInorgChem
Calculate the series limits for the Bracket series (m=4).
A. 4389 cm^-1
B. 27434 cm^-1
C. 12193 cm^-1
D. 6859 cm^-1
A

D. 6859 cm^-1

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15
Q 
1.8 GenInorgChem
What is the speed of an electron being emitted by Rb (WF=2.16 eV) when 350 nm of light shined on the metal in the vacuum?
A. 1.87(10)^5 m/s
B. 4.6(10)^5 m/s
C. 7(10)^5 m/s
D. 9.94(10)^5 m/s
A

C. 7(10)^5 m/s

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16
Q 
1.9 GenInorgChem
What is the freezing point of a 30%wt urea, (NH2)2CO solution in water?
A. -13.29 degC
B. -16.45 degC
C. -9.18 degC
D. -11.77 degC
A

A. -13.29 degC

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17
Q 
1.10 GenInorgChem
What would be the freezing point of a 0.205 molal solution with respect to urea (60 g/mol) when 200 grams of this solution is diluted with 250 grams water?
A. -0.168 degC
B. -0.172 degC
C. -0.174 degC
D. -0.176 degC
A

A. -0.168 degC

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18
Q 
1.11 GenInorgChem
What is the binding energy per nucleon for C-13 (13.003355 amu) in MeV?
A. 4.5 
B. 5.5 
C. 6.5 
D. 7.5
A

D. 7.5

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19
Q 
1.12 GenInorgChem
Starting with 1.000 gram of Sr-90, 0.953 gram will remain after 2 years. Calculate the initial activity of Sr-90 in Ci? 1 Curie (Ci) = 3.70(10)^10 disinteg/sec
A. 70 
B. 140 
C. 210 
D. 280
A

B. 140

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20
Q 
1.13 GenInorgChem
Radium 226, which undergoes alpha decay, has a half-life of 1600 years. How many alpha particles are emitted in 10 min by 10 mg sample of radium-226? 1 yr = 365 days
A. 1.1(10)^11
B. 2.2(10)^11
C. 3.3(10)^11
D. 4.4(10)^11
A

B. 2.2(10)^11

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21
Q 
8.1 Analytical Chem
What proportion by weight of Na2C2O4(134) to that of KHC2O4*H2C2O4(218.2) that must be mixed in a solution so that the normality  of the resulting solution as a reducing agent is three times the normality as an acid?
A. 3.07
B. 1.54
C. 0.65
D. 0.33
A

B. 1.54

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22
Q 
8.2 Analytical Chem
What volume of water must be added to concentrated HCl solution to prepare 100 mL 0.955 M HCl solution?
A. 7.9 mL
B. 15.8 mL
c. 46.0 mL
d. 92.1 mL
A

d. 92.1 mL

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23
Q 
8.3 Analytical Chem
What is the extent of ionization of the second proton of 0.5 M H2SO4 at 25 degC?
A. 1%
B. 2%
C. 4%
D. 8%
A

B. 2%

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24
Q

8.4 Analytical Chem
Which of the following solutions at 25 degC will have the lowest pH value?
a. 0.15 M Na2SO4 (Ka2 of H2SO4 = 1.2x10^-2)
b. 5.2E-8 M HCl
c. 0.05 M NaCN (Ka of HCN = 6.2E-10)
d. 0.01 M NH4Cl (Ka of NH4+ = 5.6E-10)

A

d. 0.01 M NH4Cl (Ka of NH4+ = 5.6E-10)

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25
Q 
8.5 Analytical Chem
What volume of 0.1025 M HCl must be added to 15.64 mL of 0.0956 M NH3 to produce a solution of pH = 9.00?
a. 5.3 mL
b. 7.3 mL
c. 9.3 mL
d. 11.3 mL
A

c. 9.3 mL

26
Q 
8.6 Analytical Chem
Approximately how many grams of NH4Cl (53.45) should be dissolved in a liter of 0.125 F NH3 to reduce the concentration of hydroxide ions to one-thousandth of its original value?
A. 79.1 g
B. 62.5 g
C. 11.7 g
D. 7.91 g
A

A

27
Q

8.7 Analytical Chem
A 0.2055 g sample of calcite (impure CaCO3) is treated with 27.18 mL of 0.0712 N HCl and the excess is found to require 5.44 mL of 0.0869 N NaOH for back titration. Calculate the percentage purity of calcite in terms of %wt/wt CaCO3 (100).

A

35.6%

28
Q 
8.8 Analytical Chem
A 500-mg sample of each mixture was analyzed for its alkaline content using 0.1025 M HCl via double indicater method.
Mixture/V_0-Ph(mL)/V_0-MR(mL)
1/4.27/10.18
2/0.01/6.19
3/5.12/10.24
4/6.37/6.38
5/5.63/9.04
  1. Which mixture contains NaHCO3
    a. 2 and 4
    b. 4 and 5
    c. 3 and 4
    d. 1 and 2
  2. Calculate the purity of the sample containing NaHCO3 only.
  3. What is the %wt NaOH for the sample containing a mixture of NaOH-Na2CO3?
A

D

  1. 64%
  2. 82%
29
Q 
8.9 Analytical Chem
A 7.279 g sample of meat was analyzed for its nitrogen content using Kjeldahl Method. Upon digestion, the ammonia liberated was collected in 250 mL of 0.855 M H3BO3. The resulting solution was titrated with 37.25 mL of 0.3122 M HCl using mixed indicator. Determine the % protein in the sample using 6.25 as factor for meat products.
A. 13.98%
B. 2.24%
C. 19.69%
D. 3.14%
A

A. 13.98%

30
Q

8.10 Analytical Chem
A mixture of LiBr(86.845) and BaBr2(297.22) weighing 800 mg is treated with 50.00 mL of 0.1879 M AgNO3 and the excess is found to require 8.76 mL of 0.3179 M KSCN for back titration, using ferric alum as indicator. What is the percentage of BaBr2 in the sample?

A

67.95%

31
Q 
8.11 Analytical Chem
A 500-mg sample containing NaCN required 23.50 mL of 0.1255 M AgNO3, to obtain a permanent faint turbidity. Express the result of this analysis as % CN-.
A. 15.34%
B. 23.01%
C. 17.25%
D. 30.67%
A

D

32
Q

8.12 Analytical Chem
A 750.25 mg alloy of nickel was dissolved and treated to remove the impurities.It’s ammoniacal solution was treated with 50 mL of 0.1075 M KCN and the excess cyanide required 2.25 mL of 0.00925 M AgNO3. Determine % Ni(58.69) in the alloy.

A

10.53%

33
Q

8.13 Analytical Chem
A 10.00 gram sample of cooked-ham was pureed with 200 mL of water, filtered and the resulting solution containing dissolved potassium nitrite was acidified. This solution was treated with 25.00 mL of 0.00514 M KMnO4 and was back titrated with 14.97 mL of 0.01678 M FeSO4. Calculate the amount of Nitrite (46.01) in ppm.

A

900

34
Q 
8.14 Analytical Chem
A 100 mL water sample was analyzed by Winkler Method. If 7.52 mL of 0.0124 M Na2S2O3 was used for titration, determine the ppm of O2 in the water sample.
A. 2.8
B. 3.5
C. 6.4
D. 7.5
A

D

35
Q 
8.15 Analytical Chem
A 500 mg sample of a solution containing cobalt (58.93) and nickel (58.69) was dissolved and diluted  to 500 mL. A 25 mL aliquot was treated with a complexing agent to produce a colored complex and the volume was adjusted to 50 mL. The following data were obtained using a 1.00 cm cell:
I. 510 nm wavelength
Co (a = 36400 M^-1-cm^-1)
Ni (a = 5520 M^-1-cm^-1)
Absorbance = 0.815
II. 656 nm wavelength
Co (a=1240 M^-1-cm^-1)
Ni (a=17500 M^-1-cm^-1)
Absorbance = 0.314
Calculate the concentration of Co in the solution in ppm.
A. 1172 ppm
B. 1940 ppm
C. 2142 ppm
D. 2343 ppm
A

D

36
Q

27.1 Envi
Following tests were performed using a sample size of 50 mL. All weights are in grams:
Tare mass of evaporating dish: 53.5433
Mass of evap dish plus residue after evap: 53.5793
Mass of evap dish plus residue after ignition: 53.5772
Tare mass of Filter: 1.5433
Residue on Filter after drying: 1.5553
Residue of filter after ignition: 1.5531

  1. Determine the concentration of total solids
  2. Determine the concentration of total suspended solids
  3. Determine the concentration of volatile suspended solids
A

720 mg/L
240 mg/L
44 mg/L

37
Q 
27.2 Envi
A 15 mL wastewater sample is placed in a standard 300 mL BOD bottle and the bottle is filled  with dilution water. The bottle had an initial dissolved oxygen concentration of 10 mg/L and a final dissolved oxygen concentration of 2.5 mg/L. A blank (a BOD bottle filled with dilution water) run in parallel showed no change in dissolved oxygen over the 5 day incubation period. Calculate the 5-day (BOD5) of the wastewater.
A. 7.5 mg/L
B. 75 mg/L
C. 150 mg/L
D. 1050 mg/L
If the BOD3 of a waste is 75 mg/L and the K is 0.150/day, what is the ultimate BOD?
A. 61 mg/L
B. 116 mg/L
C. 161 mg/L
D. 611 mg/L
A

C. 150 mg/L

B. 116 mg/L

38
Q

27.3 Envi
The town of Los Banos discharges 17360 m^3/day of treated wastewater into the Mulawin Creek. The treated wastewater has a BOD5 of 12 mg/L and a k of 0.12 at 20 degC. Mulawin Creek has a flow rate of 0.43 m^3/s and an ultimate BOD of 5.0 mg/L. The DO of the river is 6.5 mg/L and the DO of the wastewater is 1.0 mg/L.

1. Compute the DO after mixing
A. 2.55 mg/L
B. 3.65 mg/L
C. 4.75 mg/L
D. 5.85 mg/L
2. Calculate the initial ultimate BOD after mixing
A. 12 mg/L
B. 14 mg/L
C. 16 mg/L
D. 18 mg/L
A

C. 4.75 mg/L

A. 12 mg/L

39
Q 
27.4 Envi
Calculate the ThOD required for 1 mole of glycine
A. 0.5 moles
B. 1.5 moles
C. 2.0 moles
D. 3.5 moles
Calculate the ThOD and ThNOD requried for 1000 L mixture containing 200 g glycine (2 answers)
A. 299 g O2/m^3
B. 171 g O2/m^3
C. 128 g O2/m^3
D. 101 g O2/m^3
A

D. 3.5 moles
ThOD: A. 299 g O2/m^3
ThNOD: B. 171 g O2/m^3

40
Q 
27.5 Envi
Estimate the unit waste generation rate )in lb/capita/day) for a residential area consisting of approximately 1000 homes, each household is comprised of 3.5 people. Observation period is one week.
No. of Compactor Truck loads = 10
Average Size of Compactor = 20 yd^3
Unit weight of waste = 350 lb/yd^3
A. 1.53
B. 2.86
C. 3.69
D. 4.32
A

B. 2.86

41
Q 
27.6 Envi
Calculate the volumetric flow rate of leachate through a compacted clay liner if the area of the landfill is 15 ha and the liner thickness is 1 m. The hydraulic conductivity is 7.5(10)^-10 m/s. Assume that the head water is 0.6 m.
A. 7.65(10)^-10 m^3/s
B. 7.65(10)^-5 m^3/s
C. 6.75(10)^-10 m^3/s
D. 6.75(10)^-5 m^3/s
A

D. 6.75(10)^-5 m^3/s

42
Q 
33.1 Orgchem
considering substituted cycloalkyl only and ignoring stereoisomers how many C6H12 constitutional isomers are possible?
A. 6
B. 9
C. 11
D.  13
A

C

43
Q 
33.2 Orgchem
which of the following alkanes will require 5 moles of oxygen per mole for complete combustion?
A. propane
B. butane
C. pentane
D. hexane
A

A

44
Q 
33.3 Orgchem
given the compounds below which is the correct order in terms of increasing reactivity towards EAS?
1. Benzene
2. phenol
3. toluene
4. Nitrobenzene
A

4<1<3<2

45
Q 
8.16 Analytical Chem
What mass of AgI (234.77 g/mol) can be produced from a 0.512 g sample that assays 20.1% Aluminum iodide (407.68 g/mol)? 
A. 0.871 g
B. 0.178 g
C. 0.718 g
D. 0.817 g
A

B

46
Q 
8.17 Analytical Chem
A 10.231-g sample of window cleaner containing ammonia was diluted with 39.466 g of water. Then 4.373 g of solution were titrated with 14.22 mL of 0.1063 M HCl to reach a bromocresol green end point. Find the weight percent of NH3 ( 17.031 g/mol) in the cleaner.
A. 0.151
B. 2.859
C. 2.574
D. 1.100
A

B. 2.859

47
Q 
8.18 Analytical Chem
The alkalinity of natural waters is usually controlled by OH-, HCO3-, CO3 2-, present singularly or in combination. Titratin a 100.0 mL sample to a pH of 8.3 requires 18.67 mL of 0.02812 M HCl. A second 100.0-mL aliquot requires 48.12-mL of the same titrant to reach a pH of 4.5. Identify the source(s) of alkalinity in the water sample.
A. OH- only
B. HCO3- only
C. OH- and CO3 2- 
D. HCO3- and CO3 2-
A

D. HCO3- and CO3 2-

48
Q 
8.19 Analytical Chem
The purity of a sample of Na2C2O4 is determined by titrating with a standard solution of KMnO4. If a 0.5116-g sample requires 35.62-mL of 0.0400 M KMnO4 to reach the titration's end point, what is the %w/w Na2C2O4 (134g/mol) in the sample.
A. 37.3
B. 74.6
C. 93.3
D. 97.5
A

C. 93.3

49
Q 
8.20 Analytical Chem
Find the percentage by weight of MnO2 (86.94 g/mol) in a mineral specimen if the iodine liberated by a 0.1267-g sample in the net reaction below required 29.62-mL of 0.08041 N Na2S2O3.
MnO2(s) + 4H+ + 2 I- ----- Mn2+ I2 +2H2O
A. 20.43
B. 40.86
C. 61.19
D. 81.72
A

D. 81.72

50
Q 
8.21 Analytical Chem
A 3.026-g portion of a copper (II) salt was dissolved in a 250-mL volumetric flask. A 50.0-mL aliquot was analyzed by adding 1g of KI and titrating the liberated iodine with 23.33 mL of 0.04668 N Na2S2O3. Find the weight percent of Cu (63.55 g/mol) in the salt.
A. 5.72
B. 11.4
C. 17.2
D. 22.9
A

B. 11.4

51
Q 
13.1 BioChE
an amount of 1 gram of bacteria was found to utilize a substrate at a rate of 40 grams/day when the substrate concentration is high. another experiment found that the same mass of bacteria can utilize the substrate at a rate of 20 grams per day when the substrate concentration is 28 mg/ liter. what is the rate of consumption in grams/ day by 2 grams of bacteria if the substrate concentration is set at 10 mg/ liter 
A. 10.53
B. 20
C. 21.05 
D. 14.21
A

C

52
Q 
13.2 BioChE
A 1000-kg mixture containing 23% galactose, 37% glucose, 16% fructose, and 24% non-fermentable residues is fermented by yeast to produce ethanol. How much ethanol is produced if 85% of the substrate is converted to ethanol and 15% is converted to biomass?
A. 760.0 kg
B, 434.4 kg
C. 646.0 kg
D. 330.2 kg
A

D. 330.2 kg

53
Q 
13.3 BioChE
A 4000-L bioreactor operating at a steady flowrate of 850 L/hr is operated to produce 940 mg/L biomass of a microorganism (μ_max=0.8/hr, Ks=50 mg/L). Calculate the yield of biomass per substrate consumed if the initial substrate concentration is 850 mg/L.
A. 0.23
B. 1.11
C. 3.24
D. 1.13
A

D. 1.13

54
Q

27.7 Envi
The concentration of a chemical degrades in water according to first-order kinetics. The degradation constant is 0.2/day. If the initial concentration is 100.0 mg/L, how many days are required for the concentration to reach 0.14 mg/L?

A

32.9 days

55
Q

27.8 Envi
A municipal landfill has available space of 16.2 ha at an average depth of 10 m. Seven hundred sixty-five (765) m^3 of solid waste is dumped at the site 5 days a week. This waste is compacted to twice its delivered density. Draw a mass-balance diagram and estimate the expected life of the landfill in years.

A

16.25, or 16 years

56
Q

27.9 Envi
A powerplant in a college town is burning coal, clear winter morning at 8:00 am, with a wind speed of 2.6 m/s measured at 30 m elevation and an inversion layer with its base at a height of 697 m. The effective stack height is 30 m. Calculate the distance downwind X_L at which the plume released will reach the inversion layer and begin to mix downward.

A

5.8 km

57
Q

27.10 Envi
A hazardous waste incinerator is being fed methylene chloride at a concentration of 5858 mg/L in a aqueous stream at a rate of 40.5 L/min. Calculate the mass flow of the feed in units of grams per minute.

A

237.25 g/min

58
Q

27.11 Envi
A small lake is surrounded by agricultural land. The lake is 150 m long and 120 m wide. The average depth is 30 m. The lake is fed by a small pollution-free stream having an average flow rate of 1/5 m^3/s. A herbicide, Greatcrop, is detected at a concentration of 45.2 microgram/L in the lake. Greatcrop degrades biologically with a rate constant of 0.22/day. Assuming that the lake is at steady-state conditions and completely mixed at the time of sampling, what would have been the mass input of herbicide? Assume that the stream is the only source of water to the lake and that evaporation, precipitation, and seepage can be neglected.

A

11.2 kg/day

59
Q

27.12 Envi
A railroad runs near the Laguna lake river at an average flow rate of 53 cubic meters per second. The railroad maintenance company sprays the track easement land with herbicide resulting in ika herbicide concentration in the river of 65 ug/L. The city of Taguig is 18.5 km downstream. The flow velocity in the stream is 1.24 m/s. If the pesticide degradation is at a rate constant of 0.64 per day, what is the concentration of herbicide in the river near Taguig City?

A

59.13 ug/L

60
Q

27.13 Envi
Methane, carbon dioxide and other trace gases are emitted from a storage lagoon. The gas
emitted is biogas which can be collected by placing a cover over the lagoon. Likewise, the biogas
can be burned to produce heat or electricity which helps offset energy costs in the farm. It also reduces the biogas emissions from the lagoons as the methane gas of GWP 21 is converted to carbon dioxide with GWP of 1. If a lagoon produces 50 mt of gas containing 40% carbon dioxide and 60% methane on a molar basis, by how much metric tons of carbon dioxide equivalent
global warming potential (GWP) are the emissions reduced by burning the biogas?

A 
322.058 metric tons of carbon dioxide equivalent global
warming potential (GWP)

A La grand Guerre(D1) (3 decks)

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