Chemistry concepts and calculations

1. Calculate [Ag + ] for the following electrochemical cell if E cell = 0.67 V P

1. Calculate [Ag+] for the following electrochemical cell if Ecell = 0.67 V Pt | H2(g), (1.00 atm), H+ (1.00 M) || Ag+ (? M) | Ag 2. How many grams of cadmium are deposited from a…

1. Calculate and report the average mass of the polyethylene disk and flask. Inc

1. Calculate and report the average mass of the polyethylene disk and flask. Include theabsolute error in your reported values, that is, report your results as the avg. mass ± abs…

1. Calculate delta S at 27*c: 2CH4 (g) --> C2H6 (g)+ H2 (g) 2. Calculate delta S

1. Calculate delta S at 27*c: 2CH4 (g) --> C2H6 (g)+ H2 (g) 2. Calculate delta S at 27*c: 2NH3 (g) --> N2H4 (g) + H2 (g) 3. If delta H (+) and delta S (-) is it spontaneous?…

1. Calculate n(H2) obtained from 1.000 gram of Al. Also, calculate n(H2) obtaine

1. Calculate n(H2) obtained from 1.000 gram of Al. Also, calculate n(H2) obtained from 1.000 gram of Zn. 2. Prepare a graph for a 1.000 gram sample of alloy with n(H2) on the vert…

1. Calculate the % ionic bonding character in the three compounds below and then

1. Calculate the % ionic bonding character in the three compounds below and then when appropriate use ionic charge and ionic radii, predict crystal structures for the following ma…

1. Calculate the Concentration of [Fe(H2O)5SCN)]^2+ after equilibrium was reache

1. Calculate the Concentration of [Fe(H2O)5SCN)]^2+ after equilibrium was reached in one of the standard solutions. 25mL of 0.2M Fe(NO3)3 added to 5 flasks. Then following amount …

1. Calculate the Ka for an unknown monoprotic acid HX, given that a solution of

1. Calculate the Ka for an unknown monoprotic acid HX, given that a solution of 1.20 M LiX has a pH of 8.90. 4.40 9.60 4.00 4.80 None of these choices are correct. 2. Ka for benzo…

1. Calculate the activation energy of a reaction whose rate constant 4.22 * 10^-

1. Calculate the activation energy of a reaction whose rate constant 4.22 * 10^-4 s^-1 at -25 degrees C and 4.54 * 10^-4 s^-1 at 95 degrees C. Please show work for credit. 2. In t…

1. Calculate the amount of 0.1 M sucrose solution and the amount of dH2O needed

1. Calculate the amount of 0.1 M sucrose solution and the amount of dH2O needed to prepare 100 mL of unbuffered 20 mM sucrose.[Hint: use the formula c1v1 = c2v2 to calculate the a…

1. Calculate the amount of Na2HPO47H2O (in grams) needed to make 50 mL of a 0.40

1. Calculate the amount of Na2HPO47H2O (in grams) needed to make 50 mL of a 0.40 M solution. (It isn't 5.36g) 2. Calculate the amounts of Na2HPO2 and NaH2PO4 (in grams) needed to …

1. Calculate the amount of Na2HPO47H2O (in grams) needed to make 50 mL of a 0.40

1. Calculate the amount of Na2HPO47H2O (in grams) needed to make 50 mL of a 0.40 M solution. (It isn't 5.36g) 2. Calculate the amounts of Na2HPO2 and NaH2PO4 (in grams) needed to …

1. Calculate the amount of heat (in calories) absorbed when 50.0g of water at 20

1. Calculate the amount of heat (in calories) absorbed when 50.0g of water at 20degC spreads over your skin and warms to body temperature, 37degC. 2. A 102.5g sample of metal bead…

1. Calculate the amount of heat (q) produced by the combustion of 4.05 g CH4 (Hc

1. Calculate the amount of heat (q) produced by the combustion of 4.05 g CH4 (Hcomb = -890.4 kJ/mol). 2. Construct a table listing all the data and values you will need to record …

1. Calculate the amount of heat necessary to raise the temperature of 135.0 g of

1. Calculate the amount of heat necessary to raise the temperature of 135.0 g of water from 50.4 degrees Farenheit to 85.0 degrees Farenheit. The specific heat of water = 4.184 J/…

1. Calculate the anticipated pH for each of the solutions that resulted when you

1. Calculate the anticipated pH for each of the solutions that resulted when you added HCl or NaOH to the "water" beaker (a beaker containing 50 mL of DI water and chemical indica…

1. Calculate the approximate pH of the following aqueous solutions at 25C. (Note

1. Calculate the approximate pH of the following aqueous solutions at 25C. (Note: consider one decimal place for the pH answer.) a) H3PO4 (0.20 M), (pKa1=2.15, pKa2=7.15, pKa3=12.…

1. Calculate the approximate volume of HCl you will use in the back titration st

1. Calculate the approximate volume of HCl you will use in the back titration step if the mass of ASA is 325 mg per tablet. (The procedure is as described in the experiment below …

1. Calculate the atomic 87Rb/86Sr ratio of a rock sample containing Rb = 125 mg/

1. Calculate the atomic 87Rb/86Sr ratio of a rock sample containing Rb = 125 mg/g and Sr = 275 mg/g. Atomic weights: Rb = 85.46, Sr = 87.62; isotopic abun- dances: 87Rb = 27.83%, …

1. Calculate the average translational kinetic energy (sometimes just called ave

1. Calculate the average translational kinetic energy (sometimes just called average kinetic energy)... a. for one mole of gas at 365 K. Answer:  E(k)=_____J/mol b. for a single g…

1. Calculate the boiling point elevation of .100kg of water containing .010 mol

1. Calculate the boiling point elevation of .100kg of water containing .010 mol of NaCl, 0.02 mol of Na2SO4 and .03 mol of MgCL2 assuming complete dissociation of electrolytes (Kb…

1. Calculate the boiling point elevation of .100kg of water containing .010 mol

1.      Calculate the boiling point elevation of .100kg of water containing .010 mol of NaCl, 0.02 mol of Na2SO4 and .03 mol of MgCL2 assuming complete dissociation of electrolyte…

1. Calculate the cell potential for the following reaction as written at 25.00 o

1. Calculate the cell potential for the following reaction as written at 25.00 oC, given that [Zn2+ ] = 0.864 M and [Fe2+] = 0.0140 M. Zn(s)+Fe2+(aq) ? Zn2+(aq)+Fe(s) 2. For the f…

1. Calculate the change in entropy when 27 kJ of energy is transferred reversibl

1. Calculate the change in entropy when 27 kJ of energy is transferred reversibly and isothermally as heat to a large block of iron at (a) 10°C, (b) 50°C. 2. Calculate S (for the …

1. Calculate the change in the internal energy of the following systems and then

1. Calculate the change in the internal energy of the following systems and then determine whether the processes are endothermic or exothermic: (a) 25 J of work is performed by th…

1. Calculate the concentration of hydronium ion of both buffer solutions at thei

1. Calculate the concentration of hydronium ion of both buffer solutions at their starting pHs. Calculate the moles of hydronium ion present in 20.0 mL of each buffer. Buffer A Ma…

1. Calculate the concentration of the 25mL of phosphoric acid Which is neutraliz

1. Calculate the concentration of the 25mL of phosphoric acid Which is neutralized with 7.8 mL of 0.2M NaOH? 2. In a solution of NH3, the concentration of NH3 is 0.01 M, Kb is 1.8…

1. Calculate the concentrations of OH - and the pH of each basic solution. Since

1. Calculate the concentrations of OH- and the pH of each basic solution. Since NaOH donates one OH- ion for each NaOH molecule, the OH- concentration is equivalent to the NaOH mo…

1. Calculate the correlation energy for He using the results in the table above

1. Calculate the correlation energy for He using the results in the table above in eV 2. Calculate the ratio of the correlation energy to the total energy for He using the results…

1. Calculate the energy of an electron of the hydrogen atom when it is in the en

1. Calculate the energy of an electron of the hydrogen atom when it is in the energy levels indicated: a) n = 3 b) n = 6 c) n = infinity 2. Using Bohr's Equation calculate the ene…

1. Calculate the enthalpy of reaction for the reaction of nitrogen dioxide with

1. Calculate the enthalpy of reaction for the reaction of nitrogen dioxide with water represented by the following equation: 3 NO2(g) + H2O(l) ?2 HNO3(aq) + NO(g)    ?rH=? Use the…

1. Calculate the equilibrium pH of the following solutions: a.0.250 M H 2 CrO 4

1. Calculate the equilibrium pH of the following solutions: a.0.250 M H2CrO4 b. 0.250 M NaHS c. Write charge balance and mass balance equations for the solution in part b. d. Desi…

1. Calculate the final temperature of the system: A 50.0 gram sample of water in

1. Calculate the final temperature of the system: A 50.0 gram sample of water initially at 100 °C and a 100 gram sample initially at 4.57 °C are mixed. The specific heat of water …

1. Calculate the following for the given aqueous solutions at 25 degrees celsius

1. Calculate the following for the given aqueous solutions at 25 degrees celsius a. the [OH-] concentration of a Sr(OH)2 solution whose pH is 13.55 b. the pH of a 2.225 M Ba(OH)2 …

1. Calculate the following information about the radioactive isotope of radium,

1. Calculate the following information about the radioactive isotope of radium, Ra-226. The initial concentration of it in the water is 0.3 femtomolar (0.3 x 10^-15 mol/L). a. Wha…

1. Calculate the formula of the following compounds to the nearest 0.1AMU. (4 po

1. Calculate the formula of the following compounds to the nearest 0.1AMU. (4 points) a. MgO b. Al(OH)s c. CJHsO Balance the following chemical equations. (6 points, 2 each) (a) Z…

1. Calculate the formula weight of Al[C9H6ON]3. 2. A solution is prepared by dis

1. Calculate the formula weight of Al[C9H6ON]3. 2. A solution is prepared by dissolving 4.0115 g of a solid unknown in a 250 ml volumetric flask. A 10.00 ml aliquot of this soluti…

1. Calculate the formula weight of Al[C9H6ON]3. 2. A solution is prepared by dis

1. Calculate the formula weight of Al[C9H6ON]3. 2. A solution is prepared by dissolving 4.0115 g of a solid unknown in a 250 ml volumetric flask. A 10.00 ml aliquot of this soluti…

1. Calculate the formula weight of the Al [C9H6ON]3 complex that will be formed

1. Calculate the formula weight of the Al [C9H6ON]3 complex that will be formed in this experiment. 2. A student performed a gravimetric analysis of an unknown solid sample by pre…

1. Calculate the free energy change for glucose entry into cells when the extrac

1. Calculate the free energy change for glucose entry into cells when the extracellular concentration is 4.2 mM and the intracellular concentration is 4.3 mM at 37oC. Express your…

1. Calculate the free energy of transport (Gt) for the movement of sodium ions (

1. Calculate the free energy of transport (Gt) for the movement of sodium ions (Na+ ) from the extracellular space into the cell under the following conditions: [Na+ ]out = 140 mM…

1. Calculate the frequency of light with a wavelength of 2914 nm. What type of e

1. Calculate the frequency of light with a wavelength of 2914 nm. What type of electromagnetic radiation has a wavelength of 2914 nm (i.e. gamma rays, microwaves,etc.) 2. C. Calcu…

1. Calculate the heat (in joules) adsorbed by the system for each of the followi

1. Calculate the heat (in joules) adsorbed by the system for each of the following examples (the system is given in italics). Specify the sign of the heat. (a) 100 g of liquid wat…

1. Calculate the heat required to melt 9.43 g of benzene at its normal melting p

1. Calculate the heat required to melt 9.43 g of benzene at its normal melting point. Heat of fusion (benzene) = 9.92 kJ/mol Heat = _______ kJ 2.Calculate the heat required to vap…

1. Calculate the mass of KH2PO4 required to prepare 100 mL of a solution in whic

1. Calculate the mass of KH2PO4 required to prepare 100 mL of a solution in which the formal concentration of H2PO4- (F(H2PO4-)is 0.20 mol L . 2. Calculate the 2 4 volume of 0.20 …

1. Calculate the mass of oxygen (in mg) dissolved in a 6.00 L bucked of water ex

1. Calculate the mass of oxygen (in mg) dissolved in a 6.00 L bucked of water exposed to a pressure of 1.13 atm of air. Assume the mole fraction of oxygen in air to be 0.32 and th…

1. Calculate the mass of solute that must be dissolved in 50.00 mL of deionized

1. Calculate the mass of solute that must be dissolved in 50.00 mL of deionized water to prepare each of the solutions listed on p. 18 (0.5 m methanol, 0.5 m NaCl, 0.5 m CaCl2). A…

1. Calculate the mass of water produced when 9.11 g of butane reacts with excess

1. Calculate the mass of water produced when 9.11 g of butane reacts with excess oxygen. Express the mass of water numerically in grams. 2. Calculate the mass of butane needed to …

1. Calculate the mass percent (m/m) of a solution prepared by dissolving 51.56g

1. Calculate the mass percent (m/m) of a solution prepared by dissolving 51.56g of NaCl in 172.3g of H2O. Express your answer to four significant figures. 2. Vinegar is a solution…

1. Calculate the mass percent composition of nitrogen in ( N H 4 ) 2 S O 4 . Exp

1.Calculate the mass percent composition of nitrogen in (NH4)2SO4. Express your answer using four significant figures. 2.Write a balanced chemical equation for this reaction. Expr…

1. Calculate the masses of the conjugate acid and base needed to prepare each of

1. Calculate the masses of the conjugate acid and base needed to prepare each of the six buffer solutions listed in the table on the left. (pKa of H2PO 6.70) Assume the availabili…