Show the cationic poymerization of tetrahydrofuran, using phosphorous pentafluiride/water as catalyst.Prove, based on the mechanism, that phosphorous pentafluride/water is indeed a catalyst and not an initiator.

In the reaction MnO4- + 8H+ + 5e- Mn2+ + 4H20, the manganese in 3.95 grams of KMnO4 is reduced to Mn2+. How many coulombs of charge must have been transferred to the permanganate ion

Calculate the equilibrium constant for each of the reactions at 25 ∘C .

A.) 2Fe³⁺(aq)+3Sn(s)→2Fe(s)+3Sn²⁺(aq)

B.) O₂(g)+2H₂O(l)+2Cu(s)→4OH⁻(aq)+2Cu²⁺(aq)

C.) Br₂(l)+2I⁻(aq)→2Br⁻(aq)+I₂(s)

A rigid tank contains 61.5 g of chlorine gas (Cl₂) at a temperature of 77°C and an absolute pressure of 6.00 × 10⁵ Pa. Later, the temperature of the tank has dropped to 34°C and, due to a leak, the pressure has dropped to 3.90 × 10⁵ Pa. How many grams of chlorine gas have leaked out of the tank? (The mass per mole of Cl₂ is 70.9 g/mol.)

Suppose you made a copper-nickel cell where the copper was the cathode and the nickel was the anode. You add a 0.5000 M solution of copper nitrate on the cathode side and a 3.000 M solution of nickel nitrate on the anode side. What is the voltage of the cell under these conditions? The units are volts and use at least 4 significant digits in the answer. The error interval is 0.02 V.

ice at 0.0 degree C is used to cool water. What is the minimum mass of ice required to cool 325 g of water from 30.5 degree C to 4.0 degree C? (Heat of fusion= 333 J/g; specific heat capacities: ice= 2.06 J/g.K, liquid water= 4.184 J/g.K)

a. 108g b. 125g c. 325g d. 605g e. 1.75x10^4

Show me the full work.

How many grams of dipotassium succinate trihydrate (K2C4H4O4·3H2O, MW = 248.32 g/mol) must be added to 780.0 mL of a 0.0348 M succinic acid solution to produce a pH of 5.921? Succinic acid has pKa values of 4.207 (pKa1) and 5.636 (pKa2).

Succinic acid (H2C4H4O4) is a diprotic acid and the succinate ion (C2H4O42–) is the completely deprotonated form of succinic acid. The addition of the succinate ion to the solution results in a buffer. Since the desired pH of the solution is greater than pKa2 for succinic acid, we know that the solution contains a mixture of the succinate ion and the monoprotonated intermediate species (HC2H4O4–).

Use the following data on ethanol-chloroform solutions at 35°C to calculate the activity coefficients of ethanol and chloroform based on the deviations from Raoult’s Law. Explain the meaning of your answers.

Can someone help me with this please!? Thank you!!

Using 2-bromobutane as your starting material, write a generic equation for each condition indicating the expected products and show the two possible mechanisms for nucleophilic substitutions.

1-bromobutane (n-butyl bromide)

1-chlorobutane

3-bromopropene (allyl bromide)

2-chlorobutane

2-bromobutane (sec-butyl bromide)

2-chloro-2-methylpropane

2-bromo-2-methylpropane (t-butyl-bromide)

chlorobenzene

For each reaction below, calculate the minimum amount of reactant needed to make the reaction go to completion. Identify each of the reaction below as precipitation, acid/base, or redox.

Start with 0.200g of Cu. 1. Cu(s) + 4HNO3(aq)  Cu(NO3)2(aq) + 2NO2(g) + 2H2O(l) 0.200g Cu + x mL of 15.8M HNO3

2. Cu(NO3)2(aq) + 2NaOH(aq)  Cu(OH)2(s) + 2NaNO3(aq) x mL of 6.00M NaOH

3. Cu(OH)2(s) + H2SO4(aq)  CuSO4(aq) + 2H2O(l) x mL of 2.00M H2SO4

4. CuSO4(aq) + Mg(s)  Cu(s) + MgSO4 x g of Mg

After reaction 4 is complete there may be some Mg left over. Hydrochloric acid will be added to the solution.  Write the reaction for magnesium reacting with hydrochloric acid.  What kind of reaction is this?  Why does the HCl not react with the copper? (hint: activity series)

i. A two-level system has a ground level with four degenerate states and an excited level with two degenerate states at 450 cm−1 above the ground level. Please plot the ratio of the number of particles occupying the excited level to the number of particles occupying the ground level as function of temperature (Make sure that the end points and curvature are accurate but anything else can be qualitative).

How do i need more Info? This is all given to me

A 1.9450 g sample containing only Na₂CO₃ and NaHCO₃ is titrated with 35.31 mL of 0.8724 M HCl. Calculate the percentage sodium carbonate and sodium bicarbonate.

29).

A 50.00-mL sample of 0.100 M KOH is titrated with 0.100 M HNO₃. Calculate the pH of the solution after 52.00 mL of HNO₃ is added.

1.29

2.71

11.29

12.71

None of these choices are correct.

As a chemist for an agricultural products company, you have just developed a new herbicide,"Herbigon," that you think has the potential to kill weeds effectively. A sparingly soluble salt, Herbigon is dissolved in 1 M acetic acid for technical reasons having to do with its production. You have determined that the solubility product Ksp of Herbigon is 8.00×10⁻⁶.

Although the formula of this new chemical is a trade secret, it can be revealed that the formula for Herbigon is X-acetate (XCH3COO, where "X" represents the top-secret cation of the salt). It is this cation that kills weeds. Since it is critical to have Herbigon dissolved (it won't kill weeds as a suspension), you are working on adjusting the pH so Herbigon will be soluble at the concentration needed to kill weeds. What pH must the solution have to yield a solution in which the concentration of X+ is 4.50×10⁻³M ? The pKa of acetic acid is 4.76.