The hypothetical molecular square H4 is in the D4h point group. (a) Use the 4 1s-orbitals on the H’s involved in s-bonding with the metal as a basis for generating a reducible representation to produce the symmetry-adapted molecular orbital combinations of the H4 square. (b) Reduce the representation to its irreducible components. (c) Sketch the resulting symmetry-adapted molecular orbitals and properly label each of them. Use the projection operator method. (d) Sketch the molecular orbital diagram showing the relative energies of the resultant molecular orbitals. The relative energies can be estimated using the number of nodes present in each SALC.
In: Chemistry
Temperature: 96.8 oC Concentration of HCl solution: 0.04998 M
|
Trial 1 |
Trial 2 |
Trial 3 |
|
|
Initial volume of HCl (mL) |
0.00 |
0.00 |
0.00 |
|
Final volume of HCl (mL) |
3.15 |
3.84 |
3.37 |
|
Volume of HCl used (mL) |
|||
|
*Moles of Ca(OH)2 (mol) |
|||
|
Volume of Ca(OH)2 titrated (mL) |
10.00 |
10.00 |
10.00 |
|
*Molar solubility of Ca(OH)2 (M) |
|||
|
*[Ca2+] (M) |
|||
|
*[OH-] (M) |
|||
|
*Ksp |
|||
|
*Experimental average Ksp |
|||
I have to find the answers to those with * next to them and unsure how to do those calculations.
In: Chemistry
How can you apply the knowledge of molecular orbitals to explain bonding between "hybridization" orbitals, especially sp3 ? in words.. thank you!
In: Chemistry
A beaker with 1.00×102 mL of an acetic acid buffer with a pH of 5.000 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.100 M. A student adds 4.70 mL of a 0.300 M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.740.
In: Chemistry
Hypoiodous acid, HIO, has an acid dissociation constant of Ka = 2.3 x 10-11 .
a) What is the useful pH range of a buffer prepared from hypoiodous acid and its conjugate base, hypoiodite?
b) Determine the pH of a solution prepared by mixing 25.0 mL of 0.212 M hypoiodous acid with 30.0 mL of 0.126 M NaOH (you may assume that the volumes of the solutions are additive).
c) What mass of HCl(g) can be added to the solution in part (b) before it is no longer a buffer? Ka (HCl) = 4.5x10^-7
In: Chemistry
a) From the list below, pick an acid, along with its conjugate base, that can be used to make a pH 7.40 buffer.
H3PO4 Ka = 6.9 x 10-3 H2PO4- Ka = 6.4 x 10-8 HPO42- Ka = 4.8 x 10-13
b) If you have 0.100 M solutions of the acid and the conjugate base in the system that you picked and there was 20.0 mL of the base, how many mL of the acid would you need to make this buffer of pH 7.40?
In: Chemistry
76
What is the total sample size (in grams) for a sample of ethanol (CH3CH2OH) which contains 2.51 g of oxygen?
77.
What is the total sample size (in grams) for a sample of sodium nitrite which contains 3.54 g of oxygen?
In: Chemistry
What is the pH at the equivalence point in the titration of a 22.6 mL sample of a 0.371 M aqueous acetic acid solution with a 0.353 M aqueous barium hydroxide solution?
pH =
In: Chemistry
If a solution of NaOH has a 20% mass percent of NaOH and a density of 1.22 g/ml, what is the molarity of this solution ?
In: Chemistry
Draw a schematic diagram for a Perkin Elmer ultraviolet-visible spectrophotometer, clearly and specifically identifying each important part.
b. Draw a schematic diagram for a Shimadzu spectro-fluorometer, clearly and specifically identifying each important part.
c. Compare a PM tube, a PDA, and a thermocouple with respect to two different aspects.
In: Chemistry
Use your calculated value of Ksp (1.35 x 10^-7) and Kf (1140) to explain why CdC2O4 is dissolved by ammonia.
How would the formation constant for [Cd(NH3)4 +2] be affected (increase, decrease, or no change) if not all of the CdC2O4 precipitate reacted with NH3?
In: Chemistry
Thanks in advance!!!
In: Chemistry
The decomposition of XY is second order in XY and has a rate constant of 6.94×10−3 M−1⋅s−1 at a certain temperature.
If the initial concentration of XY is 0.160 M , how long will it take for the concentration to decrease to 6.00×10−2 M ? Express your answer using two significant figures.
If the initial concentration of XYXY is 0.050 MM, what is the concentration of XYXY after 500 ss ?
Express your answer using two significant figures.
In: Chemistry
Reaction enthalpy for ethanol oxidation, C2H5OH+3O2 -> 2CO2 + 3H2O is 1257 kJ/mole.
Energy content per mol fuel ______kJ Energy content per gram fuel = ____________ kJ
Energy released per mol CO2 formed ________ kJ Energy released per mol O2 consumed= ______ kJ
Moles of CO2 formed per 1000 kJ energy released ___________
In: Chemistry
a) Explain oxidative addition and carbonyl insertion reactions in organometallic chemistry with
appropriate examples.
b) Explain pictorially the σ- and π-bonding in metal-carbonyl compounds and comment on the synergistic effect.
c) What are the experimental evidences and how they support synergistic effect in metal carbonyl bonding?
In: Chemistry