Calculate (using bond energies) the heat of reaction (per mole of CO, in KJ/Mol) for the combustion of CO into CO₂. Balance and do not round final answer

Calculate (using bond energies) the heat of reaction (per mole of C₂H₂ in KJ/Mol) for the combustion of C₂H₂ into CO₂ and water. Balance and do not round final answer

Calculate the pH of the following dilute solutions:

(a) 3.42x10^-8 M hydroiodic acid, HI.

(b) 5.77x10^-9 M KOH.

A buffer solution is made by dissolving 0.230 moles of sodium hypochlorite in 1.00 L of 0.220 M hypochlorous acid (HClO). What is the pH of the solution after 0.0100 moles of sodium hydroxide is added? (The Ka of HClO is 2.9

Using activity coefficients (find them with debye-huckel equation), calculate molar solubility of Zn(OH)₂ in

c) a mixture of 40.0mL of 0.250M KOH with 60.0mL de ZnCl₂ 0.0250M (answer should be 2.8*10^-13)

d) a mixture of 20mL 0.100M KOH and 50.0mL of 0.0250M ZnCl₂

Note: if you attempt this question please solve both parts (a and b) and show your work or else your attempt will be rated as wrong/reported

Show reactions for preparing each of the following compounds by the Grignard method:

3-pentanol                                  

3-methyl-3-pentanol

Hexanoic acid

1-phenyl-1-propanol

Calculate the pressure in cm H2O exerted in the closed end of an apparatus if the atmospheric pressure is 720.0 torr and the height of the water coloumn is 22.3cm.

1.) You are given a sample of an unknown hydrate of CaSO4. The average values of the data collected and recoded in your laboratory notebook where as follows: Mass of empty crucible 31.138 g Mass of crucible and sample before heating 31.457 g Mass of crucible and sample after heating 31.436 g Calculate the formula of the CaSO4 hydrate.

2.) Sodium hydroxide pellets are very hygroscopic. Describe what happens chemically when a cover is left off a bottle of NaOH pellets. (Hint: Carbon dioxide reacts with NaOH.)

3.) A 120.0 mg sample of a lead acetate hydrate, Pb(C2H3O2)2  xH2O was heated to drive off the waters of hydration. The cooled residue weighed 103.0 mg. Calculate the value of x in the acetate formula.

Predict the standard cell potential and calculate the standard reaction Gibbs free energy for galvanic cells having the following cell reactions:

a) 3 Zn(s) +2Bi^3+(aq)--> 3 Zn^2+(aq) + 2Bi(s)

b) 2 H2(g) + O2(g)--> 2 H2O(l) in acidic solution

c)2 H2(g) +O2(g)--> 2 H2O(l) in basic solution

d) 3 Au+(aq) --> 2 Au(s) + Au^3+ (aq)

Achiral compound X has the formula C₈H₁₇Br. Y, C₈H₁₇Cl, is chiral.
X undergoes base-promoted E2 elimination to give a single alkene product Z. Under similar conditions Y produces a mixture of alkenes, including Z.
Catalytic hydrogenation of Z affords 2-methylheptane. Propose structures for X and Y.

1. Which of the following is a fission reaction?

a. ²³⁵U        +     ¹n     ➝     ¹³⁹Ba     +     ⁹⁴Kr      +    3 ¹n

b. ²H       +        ³H      ➝        ⁴He      +        ¹n

c. ²⁰⁹Bi       +       ⁵⁸Fe ➝        ²⁶⁶Mt     +     ¹n

d. ²³⁸U       +      ¹n       ➝        ²³⁹U

e. ¹p        +         e^-1     ➝          ¹n

2. Which of the following is a fusion reaction?

a. ²³⁵U      +     ¹n         ➝     ¹³⁹Ba     +     ⁹⁴Kr      +    3 ¹n

b. ²H       +        ³H      ➝        ⁴He      +        ¹n

c. ¹⁴C                           ➝        ¹⁴N      +          e^-1   

d. ²³⁸U     +      ¹n        ➝        ²³⁹U

e. ¹p         +         e^-1    ➝          ¹n

3. Which of the following atoms are radioactive?

I. Hg-200                   II. S-32           III. Ca-45

IV. C-14                      V. At-210

a. II, III, and IV

b. I and II

c. I, II, and III

d. IV and V

e. III, IV and V

4. Fact: ⁴⁰Sc is unstable and radioactive. Is its n/p ratio too high or too low? In that case, which process could lead to stability?

5. Very large nuclei tend to be unstable because of the:

6. Fact: ²⁴Na is unstable and radioactive. Is its n/p ratio too high or too low? In that case, which process could lead to stability?

a. Its n/p ratio is too high. It could attain stability by positron emission.

b. Its n/p ratio is too high. It could attain stability by electron capture or positron emission.

c. Its n/p ratio is too high. It could attain stability by beta emission.

d. Its n/p ratio is too low. It could attain stability by electron capture only.

e. Its n/p ratio is too low. It could attain stability by beta emission.

7. What is the mass of an alpha particle?

a. 4 amu

b. 3 amu

c. 2 amu

d. 1 amu

e. 0 amu

8. For most common types of radioactive decay, the order of least penetrating to most penetrating for human tissue is:

a. beta, gamma, alpha

b. gamma, alpha, beta

c. alpha, beta, gamma

d. gamma, alpha, beta

e. gamma, beta, alpha

9. The following reaction is an example of __________.

    ⁴¹Ca    →    ⁴¹K   + unknown particle

The unknown particle is _______________.

10. Complete the equation by writing the symbol of the missing particle.

²¹¹Pb   ➝ _-1b + unknown particle

14. Plutonium-242 is radioactive and unstable. Which reaction correctly represents the decay of this isotope?

a. ²⁴²Pu ➝   ¹n + ²³⁸U

b. ²⁴²Pu +    ⁴He   ➝     ²⁴⁶Cm

c. ²⁴²Pu ➝   ⁴He     + ²³⁸U

d. ²⁴²Pu ➝ ⁴He     + ²³⁶U

e. ²⁴²Pu +    _-1b   ➝     ²⁴²Np

17. Praseodymium-135 is produced by positron emission from what isotope?

a. Pr-136

b. Nd-135

c. Praseodymium-135 is stable.

d. Ce-135

e. Pr-134

A solution is made by dissolving 0.543 mol of nonelectrolyte solute in 817 g of benzene. Calculate the freezing point, Tf, and boiling point, Tb, of the solution. Constants may be found here.

For the reaction

Ti(s)+2F2(g)→TiF4(s)

compute the theoretical yield of the product (in grams) for each of the following initial amounts of reactants.

A) 4.0 g Ti, 4.0 g F2

B) 2.2 g Ti, 1.7 g F2

C) 0.240 g Ti, 0.278 g F2

4. Omit the questions on p. 10-3 of the 262 lab manual. Answer the following questions instead.
a) A research paper describes that a photochemical reaction takes place in a quartz vessel but not in a Pyrex vessel. Rationalize this observation.
b) Why does the benzopinacol precipitate from the reaction mixture even though it is a diol?
c) What is the purpose of washing with 95% ethanol?
d) The acid-catalyzed rearrangement of benzopinacol to benzopinacolone is irreversible. Explain.

A saturated, aqueous solution of a salt having the formula, AX₃, is prepared. The equilibrium that is established is: AX₃(s) <------> A³⁺(aq)+3X^-(aq). At equilibrium, the concentration of X^- is found to be 2.74x10^-7 M.

What is the solubility product constant, K_sp, for AX₃?

What is the solubility of this compound in a solution that is 1.529x10^-2 M NaX (assume that NaX is a completely soluble compound).

What is the theory behind GC and IR analysis?