Carbonyl fluoride, COF 2 , is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF 4 via the reaction 2COF 2 (g)⇌CO 2 (g)+CF 4 (g), K c =9.00 If only COF 2 is present initially at a concentration of 2.00 M , what concentration of COF 2 remains at equilibrium? Thanks! ( I keep getting .1 but that is incorrect)

What is the wavelength in meters of 91.0 kJ/mol

A solution contains 0.026 M  Hg2+2 and 0.019 M Pb2+. If you add Cl−, Hg2Cl2 and PbCl2 will begin to precipitate.

A) What is the concentration of Cl− required, in molarity, when Hg2Cl2 precipitation begins?

B) What is the concentration of Cl− required, in molarity, when Hg2Cl2 precipitation is 99.99% complete?

C) What is the concentration of Cl− required, in molarity, when PbCl2 precipitation begins?

D) What is the concentration of Cl− required, in molarity, when PbCl2 precipitation is 99.99% complete?

Finally, give the Cl− concentration range in which Hg2+2 can be completely separated from Pb2+ by precipitation.

E) Give the lowest Cl− concentration for the separation of Hg2+2 from Pb2+

F) Give the highest Cl− concentration for the separation of Hg2+2 from Pb2+.

Lactic acid, C3H6O3, occurs in sour milk as a result of the metabolism of certain bacteria. Calculate the pH of a solution of 56 mg lactic acid in 250.0 mL water. Ka for D-lactic acid is 1.4 × 10-4.

I mostly need help with solving the quadratic formula portion of this problem

Calculate the pH of the solution that results from each of the following mixtures.

1. 160.0 mL of 0.27 M HF with 230.0 mL of 0.32 M NaF

2. 185.0 mL of 0.10 M C2H5NH2 with 275.0 mL of 0.22 M C2H5NH3Cl

Please show work! Thanks!

Ka of hydrofluoric acid is 6.8 x 10−4.

What volume of a 12.0 M KOH solution needs to be diluted to produce 475 mL of 3.10 M KOH solution?

Chemistry

1. In a Diels-Alder reaction, electron-withdrawing groups in the dienophile end up preferentially in

the _________ position, and the diene must be in the ____________ conformation.

A) Endo; s-cis C) Exo; s-trans

B) Endo; s-trans D) Exo; s-cis

2.What is the hybridization of the central carbon of allene (1,2-propadiene)? A) sp B) sp2 C) sp3 D) p

3.Which of the following corresponds to the COC bond angle in diethyl ether? A) 60o B) 110o C) 120o D) 180o

4.Which of the following terms best describes the reactive nature of an organolithium reagent?

A) Carbocation B) free radical C) electrophile D) nucleophile E) carbene

Calculate the concentration of all species (H₂SO₃),(HSO₃),(H₃O⁺),(SO₃^-2),(OH-), pH and pOH in a 1.41M Na₂SO₃ (sodium sulfite) solution. The ionization constant for sulfurous acid are

H₂SO₃+H₂O->HSO₃^-+H₃O⁺   Ka1=1.4x10^-2

HSO₃^-+H₂O->SO₃^-2+H₃O⁺ Ka2=6.3x10^-8

Answer the following questions (a through f) based upon a peptide sequence with the following amino acids (one-letter symbols are given): EHSGLR

(a) What are the full names and three-letter abbreviations of the amino acids?

(b) At physiological pH, what is the best description of the chemical properties of the side chains(R groups)? (Hint: Select between nonpolar, polar uncharged, positively charged, negatively charged)

(c) Draw the structure of this peptide at pH 7.0.

(d) What is the net charge of the molecule at pH 3, 8, and 11? (Use pKa values for side chains and terminal amino and carboxyl groups as given in Table 3–1.)

(e) Estimate the pI for this peptide.

(f) What type of intermolecular force could the side chains form with water? (Note that these are interactions are with water, not with other amino acids.)

Why ice is less dense as a solid than as a liquid?

why is this property so important for the fish and other wildlife that live in the lakes and ponds of indiana

Which of the following statements are correct?

a) HCFCs are used as the replacement of CFCs because they do not reach the Stratosphere.

b) HFCs are used as the replacement of CFCs (and HCFCs) because do not contain chlorine and so do not have the ozone depletion potential associated with the well-established chlorine catalytic cycles.

c) Climate projections indicate that the ozone layer will return to 1980 levels within the next 20 years.

In a chemical reaction, exactly 2 mol of substance A react to produce exactly 3 mol of substance B.

2A = 3B

How many molecules of substance B are produced when 28.2 g of substance A reacts? The molar mass of substance A is 17.9 g/mol.

Step 1. Convert the mass of A to moles.

__________________________________mol A

Step 2. Convert the number of moles of A to the number of moles of B.

___________________________________mol B

Step 3. Convert the number of moles of B to molecules of B.

___________________________________molecules of B.

1)Determine the pH of each solution.

Part A

0.20 M KCHO2

Express your answer to two decimal places.

Part B

0.21 M CH3NH3I

Express your answer to two decimal places.

Part C

0.22 M KI

Express your answer to two decimal places.

2)

Part A

Rank the following compounds in order of decreasing acid strength using periodic trends.

Rank the acids from strongest to weakest. To rank items as equivalent, overlap them.

LiH, H2O, HCl, HBr

Information regarding the question:

Concentration of NaOH=0.05138 M

Concentration of Crystal Violet Dye Solution=0.001 M

Room Temperature=25 degree Celcius

Absorbance from the device- spectrovis(spectrophotometer)

Time: Trial 1 Trial 2

0 0.089 0.430

30 0.106    0.323

60 0.121    0.248

90 0.106    0.187

120 0.063 0.141

150 0.045 0.109

180 0.028 0.082

210 0.023 0.060

240 0.014 0.045

270 0.010 0.036

300 0.005 0.027

330 0.003 0.017

360 0.000 0.015

390 -0.001 0.008

420 -0.002 0.006

450 -0.002 0.007

The following calculations must be handwritten in your notebook. – Conversion of %Transmittance to Absorbance ■ Only one handwritten sample is necessary ■ However, all of your %Transmittance values must be converted to Absorbance in your Data Table

–The steps you took to determine the order with respect to the Crystal Violet Dye (X in the example)

– The steps you took to determine the order with respect to the NaOH (Y in the example)

– The steps you took to determine k – The overall, Modified Rate Law ■ With your values for X, Y, and k inserted into the equation

– Solve the Rate Law ■ Insert in all values necessary Result