Does the spacing between the vibronic peaks in the fluorescence emission spectra have to be the same as those in absorption spectra? why?

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The equilibrium constant Kc for the Reaction:

H2(g) + CO2(g) <--> H2O(g) + CO(g) is 4.2 at 1650 C. Initially 0.87 mol H2 and 0.87 mol CO2 are injected into a 4.9 L flask. Calculate the concentraion of each species at equilibrium

Equilibrium concentration of H2: ____ M

Equilibrium concentraion of CO2: ___ M

Equilibrium concentraion of H2O: _____M

Equilibrium concentration of CO: ______M

A 350.0 −mL buffer solution is 0.170 M in HFand 0.170 M in NaF.

A) What mass of NaOH could this buffer neutralize before the pHrises above 4.00?

B) If the same volume of the buffer was 0.360 M in HF and 0.360 M in NaF, what mass of NaOH could be handled before the pH rises above 4.00?

Sodium fluoride is added to many municipal water supplies to reduce tooth decay. Calculate the pH of a 0.00307 M solution of NaF, given that the K_a of HF= 6.80 x 10^-4 at 25 degree celcius.

What is the effect of the following changes in the O2 affinity of hemoglobin? (a) A drop in the pH of blood plasma from 7.4 to 7.2. (b) A decrease in the partial pressure of CO2 in the lungs from 6 kPa (holding one’s breath) to 2 kPa (normal). (c) An increase in the BPG level from 5 mM (normal altitudes) to 8 mM (high altitudes). (d) An increase in CO from 1.0 part per million (ppm) in a normal indoor atmosphere to 30 ppm in a home that has a malfunctioning or leaking furnace.

An HNO3(aq) solution has a pH of 1.61. What is the molar concentration of the HNO3(aq) solution?

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Ethanol (C₂H₅OH) and gasoline (assumed to be all octane, C₈H₁₈) are both used as automobile fuel. If gasoline is selling for $3.19/gal, what would the price of ethanol have to be in order to provide the same amount of heat per dollar? The density and ΔH

of octane are 0.7025 g/mL and −249.9 kJ/mol and the density and ΔH

of ethanol are 0.7894 g/mL and −277.0 kJ/mol, respectively. Assume that the products of combustion are CO₂(g) and H₂O(l). (1 gal = 3.785 L)

When 0.653 L of Ar at 1.20 atm and 227°C is mixed with 0.278 L of O2 at 501 torr and 127°C in a 400. mL flask at 27°C, what is the pressure in the flask?

How many grams of each of the following per kilogram of water in your car radiator are needed to give equal protection against freezing down to -10.0 Degrees Celcius.

A: Methy Alchohol ( CH3OH) Boiling point = 64.6 C
B Ethyele glycol C2H4 )oh)2 Boiling point 197.2 C

C: In spite of the higer cost, what advantage does ethylene glycol possses over metyhly alchol as a winter antifreeze and/or suimmer coolant? Hint conisder the physical properties of each.

The B4O5(OH)4^2- ion, present in 5.0-Ml of a saturated Na2B4O5(OH)4 solution at a measured temperature, is titrated to the bromocresol endpoint with 3.25 mL of 0.291 M HCl.

a) How many moles of B4O5(OH)4^2- are present in the sample?

b) What is the molar concentration of B4O5(OH)4^2- in the sample?

c) Calculate the Ksp for Na2B4O5(OH)4 from this data.

d) What is the free energy change for the dissolution of Na2B4O5(OH)4 at this temperature?

a)Determine the limiting reagent in aspirin synthesis given 3g of salicylic acid. b)Based on your answer, calculate the maximum weight of aspirin that you could prepare. c)As is true for most "organic" reactions the synthesis you do here is an equilibrium reaction. What steps could you take to improve the yield. d)The solubility of aspirin in ethanol is approximately 40g/100 mL at room temperature. If you had a 100% yield, how many milliliters of ethanol would you need to dissolve your product for the recrystallization step?

Construct the titration curve, for the titration of 50.0 mL of 0.125 M trimethylamine with 0.175 M HCL(aq). Please draw a graph and show all work.

a) Calculate the initial pH of the solution in the flask?

b) Calculate the pH of solution mixture after 15 mL of titrant is added?

c) Calculate the pH at the equivalence volume?

d) Calculate the pH at of the mixture after 45 mL of titrant is added?

e) Calculate the pH of the mixture after 60 mL of titrant is added?

Please help.. this is problem from my review sheet for the exam and I have no idea how to do it. Please show full work so I can understand it.

You need to prepare an acetate buffer of pH 5.87 from a 0.841 M acetic acid solution and a 2.92 M KOH solution. If you have 975 mL of the acetic acid solution, how many milliliters of the KOH solution do you need to add to make a bufer of pH 5.87? The pKa of acetic acid is 4.76.

the standard free energy change for the decomposition of two moles of hydrogen peroxide at 25^​o​ C is -224 kJ.

2H_​2O_​2(l) -> 2 H_​2O(l) + O_​2 (g)           delta G^​o = -224kJ

a.      Calculate the equilibrium constant for the reaction

b.      What is the chemical significance of the value of the equilibrium constant?

c.       The standard enthalpy change, delta H^​o , for decomposition of hydrogen peroxide is + 196.1 kJ. Determine the standard entropy change, delta S^_​​o, for the reaction at 25^o ​C?

d.      i) what is the significance of the standard free energy change?

         ii) What is the significance of the standard enthalpy change?

         iii) What is the significance of the standard entropy change?