Chemistry concepts and calculations

45) using ideal gas equation , PV= nRT V=25L , P=702mmHg = 702/760 atm, T=22.5 o

45) using ideal gas equation , PV= nRT V=25L , P=702mmHg = 702/760 atm, T=22.5oC = 295.5K R, gas constant =0.0821Latm/mol/K n =( 702 *25)/ (760*0.0821*295.5) = 0.95mol 46) Accordi…

45. (2 pts. Show your work) A solution of acetic acid, CH,CO.H, is prepared by d

45. (2 pts. Show your work) A solution of acetic acid, CH,CO.H, is prepared by dissolving 30.0 mL of acetic acid in enough water to give a total volume of 150.0 ml. What is the pe…

45. Consider these three compounds Which are isomers? A. I and Il only B. II and

45. Consider these three compounds Which are isomers? A. I and Il only B. II and III only C. land only D· I,II, and III 46 Sulfur dioxide, the primary product of salfur combustion…

45. Explain why the molar enthalpies of vaporization of the following substances

45. Explain why the molar enthalpies of vaporization of the following substances increases in the order CH4 < C2H6 < C3H8, even though all three substances experience the sa…

45. For a particular reaction. the rate constant doubles %hen the temperature is

45. For a particular reaction. the rate constant doubles %hen the temperature is raised from 300 K to 310 K. What is the activation energy (in kJ mol5 ^-1)? (A) -0.0596 kJ mol^-l …

45. For the reaction: 2N05 + 2Mn(OH)2 N20 + 2MnOz + H20 + 20H- The oxidation sta

45. For the reaction: 2N05 + 2Mn(OH)2 N20 + 2MnOz + H20 + 20H- The oxidation state of manganese changes from what to what? How many electrons are transferred in the reaction? a. b…

45. If the concentration of Off in an aqueous solution is 1.4 X 10-7 M. concentr

45. If the concentration of Off in an aqueous solution is 1.4 X 10-7 M. concentration of H30 is B) 1.0× 10-7M O 1.4 x 10-7 M D)7.1x10-8M. E) 1.3 10-8 46, Which solution is basic? …

45. Refer to the following heating curve (temperature vs. heat input) for a part

45. Refer to the following heating curve (temperature vs. heat input) for a particul f oints) the curve: (8 points) where the arrows relate specific temperatures to specific point…

45. The oxidation half-reaction for the standard hydrogen electrode is: a. H 2 (

45. The oxidation half-reaction for the standard hydrogen electrode is: a. H2 (g) 2H+ (aq) + 2e- b. 2H+ (aq) + 2OH- (aq) H2O (l) c. Pt2+(aq) + 2e- à Pt(s) d. 2H+(aq) + 2e- H2 (g) …

45. Which of the following is an implementation of the system? a. Specification

45. Which of the following is an implementation of the system? a. Specification model b. Analysis model c. Design model d. Code model 46. Which of the following(s) describe(s) the…

45.0 14) Calculate the constant external pressure of 1.5 mmtL·m-101 a. +5.3 1J b

45.0 14) Calculate the constant external pressure of 1.5 mmtL·m-101 a. +5.3 1J b. +3.0 kJ work eneny, w, gained or lost by the system 5.3 15) Ir 4.89 g of ZaCl2 is dissolved solut…

45.0 14) Caleulate the work energy, w, gained or lost by the sytmwhen a s consta

45.0 14) Caleulate the work energy, w, gained or lost by the sytmwhen a s constant extemal pressore of 1.3 am +5.3 b. +3.0N 5.3 g of2aCi i disolved in enough water to give otal vo…

45.0 mL of a 0.10-M formic acid (HCHO2, Ka=1.7x10^-4) solution was titrated with

45.0 mL of a 0.10-M formic acid (HCHO2, Ka=1.7x10^-4) solution was titrated with a 0.20-M NaOH solution. What is the equivalent volume? Calculate which is in excess. 6. What is th…

45.8 g of NaCl is dissolved in 500. mL of a water (d = 1.00 g/mL) and is placed

45.8 g of NaCl is dissolved in 500. mL of a water (d = 1.00 g/mL) and is placed in the freezer at -1 °C overnight. Which statement best describes what would happen to the solution…

45g of Calcium carbonate is added to a 1.5L solution of hydrochloric acid with a

45g of Calcium carbonate is added to a 1.5L solution of hydrochloric acid with a density of 1.13 gHCl/mL. Assuming volume remains constant, what will the molar concentration of HC…

46 9 mL of 0.749 M hydrobromic acid is added lo 37.8 mL of calcium hydroxide, an

46 9 mL of 0.749 M hydrobromic acid is added lo 37.8 mL of calcium hydroxide, and the resulting solution is found to be acidic. 19.0 mL of 0.547 M barium hydroxide is required to …

46 Calculate the mass percent composition of oxygen in Li,PO 47. Choose the corr

46 Calculate the mass percent composition of oxygen in Li,PO 47. Choose the correct halanced squation that shows the reaction of gaseous ethane with C.26.76 % A.30.72 % D. 55.27% …

46) If the calibration unit of a buret is 0.1 ml, to what precision can you meas

46) If the calibration unit of a buret is 0.1 ml, to what precision can you measure this buret? A. to the nearest 1 ml B. to the nearest 0.1 mL C. to the nearest 0.01 mL D. to the…

46) Where is NADPH produced and where is it used in cell metabolism? A) NADPH is

46) Where is NADPH produced and where is it used in cell metabolism? A) NADPH is produced during glycolysis and used for pyruvate and oxaloacetate synthesis B) NADPH is produced d…

46, which of the following relatonships sinoorect? metric d 1 kilogram 10 gram b

46, which of the following relatonships sinoorect? metric d 1 kilogram 10 gram b) 1 megagram 10 gram cl 1 millimeter 10 meter 47. Which set of compounds belowisa erin schal member…

46. Of the following, which is the best method to prepare t-butyl methyl ether?

46. Of the following, which is the best method to prepare t-butyl methyl ether? a. CH OH+ Na; then (CH) CCI b. (CHs) COH +Na; then CHyl c. CHyBr+Mg; then (CH) COH d. CH OH +(CHs)h…

46. Torsional strain is caused by a. the deviation of bond angles from the expec

46. Torsional strain is caused by a. the deviation of bond angles from the expected 109.5 degreein carbon compounds b. the repulsive action of bulky groups c. repulsive opposite c…

46. Torsional strain is caused by a. the deviation of bond angles from the expec

46. Torsional strain is caused by a. the deviation of bond angles from the expected 109.5 degreein carbon compounds b. the repulsive action of bulky groups c. repulsive opposite c…

46. Which of the following ionic compounds is most likely to be insoluble in wat

46. Which of the following ionic compounds is most likely to be insoluble in water? Cas b) Ca (NO3)2 c) Naso. d) KI e) NaOH 47. When a hot-pack is activated, a chemical reaction o…

46.9mL of 0.749 M hydrobromic acid is added to 37.8 mL of calcium hydroxide, and

46.9mL of 0.749 M hydrobromic acid is added to 37.8 mL of calcium hydroxide, and the resulting solution is found to be acidic. 19.0 mL of 0.547 M barium hydroxide is required to r…

47) What is the mass, in grams, of one mole of CI atoms? 48) What is the form R

47) What is the mass, in grams, of one mole of CI atoms? 48) What is the form R HERE-gc,4yumr- PLACE ANSWER HERE 254. au MUST SHOW YOUR WORK ON ATTACHED SHEETS PLACE ANSWER HERE 4…

47) Write the name for SnS. 47) A) tin sulfide B) stannous sulfide C) stannous s

47) Write the name for SnS. 47) A) tin sulfide B) stannous sulfide C) stannous sulfate D) stannic sulfide E) stannic sulfate 48) What is the volume (in cm3) of a 43.6 g piece of m…

47. At high temperatures carbon dioxide reacts with hydrogen CO2(g) + H2(g)CO(g)

47. At high temperatures carbon dioxide reacts with hydrogen CO2(g) + H2(g)CO(g) + H2O(g) Kp = 1.4 at 1 100 K At 1100 K. the initial pressures of carbon dioxide and hydrogen are b…

47. At high temperatures carbon dioxide reacts with hydrogen CO2(g) + H2(g)CO(g)

47. At high temperatures carbon dioxide reacts with hydrogen CO2(g) + H2(g)CO(g) + H2O(g) Kp = 1.4 at 1 100 K At 1100 K. the initial pressures of carbon dioxide and hydrogen are b…

47. During exercise, body temperature is regulated by making adjustments in a. t

47. During exercise, body temperature is regulated by making adjustments in a. the amount of heat produced. b. the resting metabolic rate. c. the amount of heat lost. d. none of t…

47. During exercise, body temperature is regulated by making adjustments in a. t

47. During exercise, body temperature is regulated by making adjustments in a. the amount of heat produced. b. the resting metabolic rate. c. the amount of heat lost. d. none of t…

47. For the photochemically driven reaction of H2 with 12, a possible mechanism

47. For the photochemically driven reaction of H2 with 12, a possible mechanism is 2 h21 With this mechanism the number of HI molccules produced per photon absorbed is (A) greater…

47. If the de Broglie wavelength of an electron is 44 nm, what is its velocity?

47. If the de Broglie wavelength of an electron is 44 nm, what is its velocity? The mas of am electron is 911 10 k a. 6.0 x 10m's b.1.203m/s c.1.7×104 m/s d. 3.1 x 101 ms e. 4.8 1…

47. In this structure determination technique, a spectrum is obtained by plottin

47. In this structure determination technique, a spectrum is obtained by plotting Absorbance or %Transmittance vs. wavelength or wave number. a. UV b. Vis c. mass sped d. NMR e. I…

47. Nitrous acid, HNO2(aq), has a Ka of 4.5x 10-4 at 25°C. What is the pH of a s

47. Nitrous acid, HNO2(aq), has a Ka of 4.5x 10-4 at 25°C. What is the pH of a solution that contains 1.0 M KNO2(aq) and 0.50 M HNO2(aq)? (A) 0.183 (B) 3.05 (C) 3.35 CD) 3.65 48. …

47. One mole of CO2 at STP will occupy A) 22.4 L B) 1.0 L C) 245 L D 44 L 44 48.

47. One mole of CO2 at STP will occupy A) 22.4 L B) 1.0 L C) 245 L D 44 L 44 48. A chemist needs 225 ml. of 2.4 M HCI. What volume of 12 M HCI must be dissolved in water to form t…

47. The elements X, Y, and Z form these compounds: XCl4, XZ2, and YO. What formu

47. The elements X, Y, and Z form these compounds: XCl4, XZ2, and YO. What formula would you predict for the compound formed between Y and Z? (Assume normal oxidation states of Cl…

47. When the following equation is balanced with the smallest inmegral O: is ? C

47. When the following equation is balanced with the smallest inmegral O: is ? CaHnO (l) + 02 (g) 4 CO (g) + 5110 (g) A. 1 B. C. 3 D. 4 coefficients, the coefficient of the 2 s Ss…

47. Which of the following factors is important in a theoretical description of

47. Which of the following factors is important in a theoretical description of chromatógraphic behavior? (A) longitudinal (molecular) diffusion (B) flow characteristics of the mo…

47. You have isolated an octapeptide from a rare fungus that prevents baldness a

47. You have isolated an octapeptide from a rare fungus that prevents baldness and you are interested in its commercial possibilities. Analysis gives the amino acid composition of…

4791 12017-2018 1a Part 1 -Short Answer: (46 points) Place your anwer in e space

4791 12017-2018 1a Part 1 -Short Answer: (46 points) Place your anwer in e space gien Show work 1) In the space provided, provide the conjugate acid or bose for each of the ulowin…

48 Identify the ions that exist in each aqueous solution, and specify the concen

48 Identify the ions that exist in each aqueous solution, and specify the concentration of each ion. (a) 0.25 M (NH_4)_2 SO_4 (b) 0.123 M Na_2 CO_3 (c) 0.056 M HNo_3 Identify the …

48. Consider a buffer solution containing HCN and NaCN where the concentration o

48. Consider a buffer solution containing HCN and NaCN where the concentration of HCN is double the concentration of NaCN. Which statement about the buffer solution is true The pH…

48. For a certain reaction, the mechanism has been proposed. A(g) + B(g) X(g) [f

48. For a certain reaction, the mechanism has been proposed. A(g) + B(g) X(g) [fast] X(g) + C(g) right arrow Y(g) [slow] Y(g) right arrow D(g) [fast] Which statement is correct? (…

48. In Engineering Heat transfer studies, the experimental approach has the adva

48. In Engineering Heat transfer studies, the experimental approach has the advantage that we deal with the actual physical system, and the desired quantity is determined by measu…

48. The heat of fusion of ice is 333 J/g (meaning 333 J is absorbed when 1 gram

48. The heat of fusion of ice is 333 J/g (meaning 333 J is absorbed when 1 gram of ice melts). The heat of vaporization of liquid water at 100 °C is 2257 1/g. Calculate the change…

48. What is the final temperature (in o C) of a 37.9 g sample of aluminum (speci

48. What is the final temperature (in oC) of a 37.9 g sample of aluminum (specific heat = 0.900 J/(g K)) which absorbs 86.2 kJ of heat when it warms from 71oC? 49. A new substance…

48. Which of the following increases the solubility of a gas in solution? Decrea

48. Which of the following increases the solubility of a gas in solution? Decreasing gas pressure and increasing temp Decreasing gas pressure and decreasing temp Increasing gas pr…

48. Which statement is not correct? a. the aqueous hydrogen ion (H degree ) is t

48. Which statement is not correct? a. the aqueous hydrogen ion (H degree ) is the only species for which delta H? degree S degree , and delta G degree f each have a value of zero…

48. Which statement is not correct? a. the aqueous hydrogen ion (H*) is the only

48. Which statement is not correct? a. the aqueous hydrogen ion (H*) is the only species for which delta H degree f, S degree, and delta G degree f each have a value of zero at 25…