Chemistry concepts and calculations

1) Calculate Delta Srxn for 2Mg( s )+O2( g )?2MgO( s ) (Please show work) 2) Fir

1) Calculate Delta Srxn for 2Mg(s)+O2(g)?2MgO(s) (Please show work) 2) Firefly luciferase is the enzyme that allows fireflies to illuminate their abdomens. Because this light gene…

1) Calculate [H3O+] in each aqueous solution at 25C, and classify each solution

1) Calculate [H3O+] in each aqueous solution at 25C, and classify each solution as acidic or basic. Part A [OH]= 5.2×104 M Express your answer using two significant figures. Part …

1) Calculate each of the following quantities. (a) mass in kilograms of 3.9 1020

1) Calculate each of the following quantities. (a) mass in kilograms of 3.9 1020 molecules of NO2 - kg (b) moles of Cl atoms in 0.0379 g C2H4Cl2 - mol (c) number of H - ions in 3.…

1) Calculate for the electrochemical cell below, Pb(s) |PbSO4(s) | Pb2+(aq) Ag+(

1)Calculate for the electrochemical cell below, Pb(s) |PbSO4(s) | Pb2+(aq) Ag+(aq) | Ag(s) given the following standard reduction potentials. Ag+(aq) + e- ->Ag(s) E° = +0.799 V…

1) Calculate how many moles of KOOCH would be needed to create 1.00 L of a pH =

1) Calculate how many moles of KOOCH would be needed to create 1.00 L of a pH = 9.069 solution. Assume the volume does not change as the solution is formed. 2) A 0.029 mol sample …

1) Calculate how many moles of KOOCH would be needed to create 1.00 L of a pH =

1) Calculate how many moles of KOOCH would be needed to create 1.00 L of a pH = 9.069 solution. Assume the volume does not change as the solution is formed. 2) A 0.029 mol sample …

1) Calculate how many moles of NH3 form when each quantity of reactant completel

1) Calculate how many moles of NH3 form when each quantity of reactant completely reacts according to the equation: 3N2H4(l)4NH3(g)+N2(g) A) 35.3 g N2H4 - Express your answer usin…

1) Calculate of pH of each of the following strong acid solutions: (a) 8.5 x 10^

1) Calculate of pH of each of the following strong acid solutions: (a) 8.5 x 10^-3 M HBr, (b) 1.52 g of HNO3 in 575 mL of solution, (c) 5.00 mL of 0.250 M HClO4 diluted to 50.0 mL…

1) Calculate the E cell of: Al(s) + Cu 2+ (aq)(0.010M) ? Al 3+ (aq)(1.0M) + Cu(s

1) Calculate the Ecellof: Al(s) + Cu2+(aq)(0.010M) ? Al3+(aq)(1.0M) + Cu(s) (is this balanced?) A) 2.06 B) 1.94 C) -2.06 2) Calculate the Eocell for: Fe(s) + Br2(g) ? Fe2+(aq) +Br…

1) Calculate the amount of energy (in kJ) necessary to convert 357 g of liquid w

1) Calculate the amount of energy (in kJ) necessary to convert 357 g of liquid water from 0*C to water vapor at 172*C. The molar heat of vaporization of water is 40.79 kJ/mol. The…

1) Calculate the calorimeter constant, Ccal. Assume that 1.0 mL of water has a m

1) Calculate the calorimeter constant, Ccal. Assume that 1.0 mL of water has a mass of 1.0 g. The specific heat for water is 4.184 J / C-g. We placed 2 styrofoam cups together as …

1) Calculate the calorimeter constant, Ccal. Assume that 1.0 mL of water has a m

1) Calculate the calorimeter constant, Ccal. Assume that 1.0 mL of water has a mass of 1.0 g. The specific heat for water is 4.184 J / C-g. We placed 2 styrofoam cups together as …

1) Calculate the change in the entropy of the system, the surroundings, and the

1) Calculate the change in the entropy of the system, the surroundings, and the universe, when 1 L of an ideal gas at 298 K and 2 bar is expanded to 2 L at the same temperature vi…

1) Calculate the concentration of hydrogen ions, OH ions andph of 0.0014M HCL? 2

1) Calculate the concentration of hydrogen ions, OH ions andph of 0.0014M HCL? 2)How much NaOH (in mg) is needed to prepare 546 mL ofsolution with a pH of 10.00? 4) calculate the …

1) Calculate the degree of unsaturation for C1HeCIBro. SHOW CALCULUATION FOR FUL

1) Calculate the degree of unsaturation for C1HeCIBro. SHOW CALCULUATION FOR FULL CREDIT 2) Which one of the following compounds is consistent with the mass spectrum below? A) (CH…

1) Calculate the degree of unsaturation for CuiHgCIBrO . SHOW CALCULUATION FOR F

1) Calculate the degree of unsaturation for CuiHgCIBrO . SHOW CALCULUATION FOR FULL CREDIT 2) Which one of the following compounds is consistent with the mass spectrum be low? 100…

1) Calculate the enthalpy change, H , for the process in which 16.7 g of water i

1) Calculate the enthalpy change, H, for the process in which 16.7 g of water is converted from liquid at 13.3 C to vapor at 25.0 C . For water, Hvap = 44.0 kJ/mol at 25.0 C and C…

1) Calculate the formula weight for the compounds of the formula [(Cu(NH3)x)]SO4

1) Calculate the formula weight for the compounds of the formula [(Cu(NH3)x)]SO4*H20, where x=1^-6 2) Assuming x=1, how much CuSO4*5H20 would you need to prepare 6g of copper ammi…

1) Calculate the freezing point depression expected for an aqueous solution made

1) Calculate the freezing point depression expected for an aqueous solution made by mixing 185.0 grams of glycerol, C3H8O3, with 8.00*102 grams of water. Show your work with corre…

1) Calculate the freezing point of a solution that contains 5.37 g of glucose, a

1) Calculate the freezing point of a solution that contains 5.37 g of glucose, a non electrolyte, dissolved in 118 of water. (Please show work) 2) If 5.33 g of Ethylene Glycol are…

1) Calculate the freezing point of the following solutions, assuming complete di

1) Calculate the freezing point of the following solutions, assuming complete dissociation.          c. 5.2% NaNO3 by mass (in water)          d. Calculate the boiling point of th…

1) Calculate the heat transferred to the system when 1.00 mol of a perfect gas e

1) Calculate the heat transferred to the system when 1.00 mol of a perfect gas expands reversibly at a constant temperature of 25°C so that its volume doubles. 2) The constant pre…

1) Calculate the mass defect (in amu) for bismuth-209 if the exact mass of this

1) Calculate the mass defect (in amu) for bismuth-209 if the exact mass of this atom is 208.980383 amu? The exact mass of a proton is 1.007276467 amu and the exact mass of a neutr…

1) Calculate the masses of Ca(NO 3 ) 2 x4H 2 O (s) and KIO 3(s) required tomake

1) Calculate the masses of Ca(NO3)2 x4H2O(s) and KIO3(s) required tomake 10 g of Ca(IO3)2(s). Calculate theamount of Ca(NO3)2 x4H2O(s) needed so that the Ca2+ isin excess of the i…

1) Calculate the molar mass of a compound if a solution of 12.0g dissolved in 80

1) Calculate the molar mass of a compound if a solution of 12.0g dissolved in 80.0g of water freezes at -1.94 C. (Kf water= 1.86 C/m) Answer is supposed to be 144g/mol but how do …

1) Calculate the molarity of each of the following solutions. Part A 0.30 mol of

1) Calculate the molarity of each of the following solutions. Part A 0.30 mol of LiNO3 in 6.32 L of solution Express your answer using two significant figures. Part B 71.8 g C2H6O…

1) Calculate the molarity of the solution. (Assume a density of 1.05 g/mL for th

1) Calculate the molarity of the solution. (Assume a density of 1.05 g/mL for the solution. (Assume a density of 1.05 g/mL for the solution.) Calculate the molarity, molality and …

1) Calculate the momentum of an electron traveling 46.9% the speed of light. Rep

1) Calculate the momentum of an electron traveling 46.9% the speed of light. Report answer in kg(m/s) to 3 significant digits. Do not put units in answer box. 2)Which quantum numb…

1) Calculate the number of grams of oxalic acid dihydrate, H 2 C 2 O 4 .2H 2 O,

1) Calculate the number of grams of oxalic acid dihydrate, H2C2O4.2H2O, that are needed to prepare 250.0 mL of 0.15N solution. (When the crystals are dissolved, the water in the h…

1) Calculate the pH and find the fraction of dissociation of 0.5 M benzoic acid.

1) Calculate the pH and find the fraction of dissociation of 0.5 M benzoic acid. 2) Find the pH and the fraction of association of a 0.02 M 4-methoxyaniline solution. 3) Find the …

1) Calculate the pH of a 2.4 L buffer solution that contains 0.300 M of a weak a

1) Calculate the pH of a 2.4 L buffer solution that contains 0.300 M of a weak acid HA and 0.220 M of its conjugate base, A. The Ka of HA is 5.5x10 2) Assume 0.270 moles of HCl is…

1) Calculate the pH of a buffer solution which is 0.36 M in HNO 2 and 0.39 M in

1) Calculate the pH of a buffer solution which is 0.36 M in HNO2 and 0.39 M in NaNO2. Ka of HNO2 = 4.6x10-4 at 25oC 2) An acetic acid/sodium acetate buffer is made that is 0.45 M …

1) Calculate the pH of a buffer solution which is 0.36 M in HNO 2 and 0.39 M in

1) Calculate the pH of a buffer solution which is 0.36 M in HNO2 and 0.39 M in NaNO2. Ka of HNO2 = 4.6x10-4 at 25oC 2) An acetic acid/sodium acetate buffer is made that is 0.45 M …

1) Calculate the pH of a solution that contains 7.8 x 10-6 MOH A) 1.28 B) 5.11 C

1) Calculate the pH of a solution that contains 7.8 x 10-6 MOH A) 1.28 B) 5.11 C) 12.72 D) 8.89 E) 9.64 2) Which of the following acids is the WEAKEST? The acid is followed by its…

1) Calculate the percent composition by mass (to 4 significant figure) of all th

1) Calculate the percent composition by mass (to 4 significant figure) of all the elements in calcium phosphate [Ca3(PO4)2], a major component of bone %Ca? %P? %O? 2) Menthol is a…

1) Calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH

1) Calculate the ratio of CH3NH2 to CH3NH3Cl required to create a buffer with pH=10.26 Part A: What is the pH of a buffer prepared by adding 0.405mol of the weak acid HA to 0.608m…

1) Calculate the standard electrode potential difference (E°) of the Daniell cel

1) Calculate the standard electrode potential difference (E°) of the Daniell cell (at 25 °C) if pressure is 500 MPa. a) 1.099 b) 1.102 V c) 1.080 V correct answer 1.099 2) Using C…

1) Calculate the standard entropy change for the following reaction. 2N 2 (g) +

1) Calculate the standard entropy change for the following reaction. 2N2(g) + 6H2(g) ? 4NH3(g) 191.5 130.6 192.3 794.8 J/K?mol-rxn –129.8 J/K?mol-rxn –794.8 J/K?mol-rxn –737.2 J/K…

1) Calculate the standard free-energy change at 25 ?C for the following reaction

1) Calculate the standard free-energy change at 25 ?C for the following reaction using the table in the introduction: Mg(s)+Fe^2+(aq)?Mg^2+(aq)+Fe(s) Answer should be in J 2) Calc…

1) Calculate the volume of 0.100 M HCl that is required to react with 50.0 mL of

1) Calculate the volume of 0.100 M HCl that is required to react with 50.0 mL of 0.100 M ammonia to form a mixture that has the desired pH. Hint: think of this as a titration prob…

1) Calculate the volume of 0.100 M HCl that is required to react with 50.0 mL of

1) Calculate the volume of 0.100 M HCl that is required to react with 50.0 mL of 0.100 M ammonia to form a mixture that has the desired pH. Hint: think of this as a titration prob…

1) Calculate the work, w , gained or lost by the system when a gas expands from

1) Calculate the work, w, gained or lost by the system when a gas expands from 15 L to 40 L against a constant external pressure of 1.5 atm. 1 L atm = 101 J 2)When 20.00 moles of …

1) Can 2-butanol be made from butanoic acid? Why or why not? 2) Starting with on

1) Can 2-butanol be made from butanoic acid? Why or why not? 2) Starting with only 1-propanol as your ONLY organic starting material, come up with a reaction scheme to produce: O …

1) Carbon dioxide and water combined typically make up 1-3% of our atmosphere, a

1) Carbon dioxide and water combined typically make up 1-3% of our atmosphere, and yet, we are constantly monitoring the atmospheric content of CO2 and H2O. Why? Explain why they …

1) Carbonyl fluorideCOF2 is an important intermediate used in the production of

1) Carbonyl fluorideCOF2 is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluorid…

1) Carbonyl fluorideCOF2 is an important intermediate used in the production of

1) Carbonyl fluorideCOF2 is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluorid…

1) Cation exchange chromatography, more specifically, uses a negatively charged

1) Cation exchange chromatography, more specifically, uses a negatively charged ion exchange resin with an affinity for molecules having net positive surface charges. therefore, a…

1) Certain popular antacids are dissolved in water (with much fizzing) and are t

1) Certain popular antacids are dissolved in water (with much fizzing) and are taken in the form of a solution. When the antacid and water are mixed, what kind of change occurs? a…

1) Chemicals in the environment can cause mutations. A rather low level of mutat

1) Chemicals in the environment can cause mutations. A rather low level of mutation is caused by chemical "A"; the mutation rate is 0.007 mutants generated per nmol chemical "A" i…

1) Choose all of the statements from below which correctly describe issues perta

1) Choose all of the statements from below which correctly describe issues pertaining to the relationship between the emf of a reaction and its Gibbs free energy change. a) The Gi…