What is the potential of a cell made up of Zn|Zn²⁺ and Cu|Cu²⁺ half-cells at 25^o C if [Zn²⁺] = 0.25 M and [Cu²⁺] = 0.15 M?

(Answer should be E = +1.09 V but I need to know how to get to that)

0.560 g He, 20.482 g F₂, and 13.960 g Ar are placed in a 18.4-L container at 25 ^oC. What are the molar concentrations and partial pressures of the gases?
(All values to the nearest 0.0001)

What is the total pressure in the container?

P = atm

which one is more nucleophilic: hydroxide ion (OH) , or ammonia (NH3)? Explain why

A sample mixture of ethyl benzoate (bp 212 C) and dodecane (bp 216.2 C) is injected on two GC columns. Column A has DC710 silicone oil as the stationary phase, and column B uses polyethylene glycol as the stationary phase. Which substance would be certain to elute first from column A and would the same material be expected to elute first from column B? Which column, A or B, would be expected to give the better separation of these two substances?

A particular uncatalyzed reaction proceeds 200 times faster at 45 degrees celcius than at 0 degrees celsius

A. Calculate the activation energy for the reaction

B. when the reaction at 45 degrees celsius is catalyzed, the reaction rate increases by a factor or 500. calculate the activation energy for the catalyzed reaction?

A gaseous sample of a certain compound follows the postulates of the kinetic molecular theory and has a most probable speed pf 264.13 m/s at a certain temperature.

A) The molecules in this sample are a binary compound of sulfur and nitrogen that is 30.4 mass percent nitrogen. The molar mass of this compound is between one hundred fifty and two hundred g/mole. Determine the molecular formula of this compound and the temperature of this sample in degrees Celsius.

B) This gaseous sample, at the above temperature, is in a 5.00 L container at a pressure of 280 torr. Determine the collision frequency of these molecules with a 2.00 mm² area of the container wall. Express your answer in moles/second.

Carbonyl fluoride, COF2, is an important intermediate used in the production of fluorine-containing compounds. For instance, it is used to make the refrigerant carbon tetrafluoride, CF4 via the reaction

2COF2(g)⇌CO2(g)+CF4(g),    Kc=7.40

If only COF2 is present initially at a concentration of 2.00 M, what concentration of COF2 remains at equilibrium?

Where I get stuck is figuring out how to multiply (x)(x)/ (2.00-2x)^2 I know this is easy math but can you please work it out step for step so that I can see exactly how you go the answer.

The reaction between silver nitrate and zinc chloride is 95% effective. If 250 g of silver nitrate reacts with 250 g of zinc chloride, what will be the actual yield of the products?


THANKS SO MUCH FOR YOUR HELP.

PLEASE SHOW ALL WORK. I WILL RATE

The center of a cubic hole is found ________

A semipermeable membrane separates two aqueous solutions at 37 °C. For each of the following cases, name the solution into which a net flow of water (if any) will occur.

Net flow is toward solution a; Net flow is toward solution B; no net flow

choices to be labeled under the 3 categories above:

- Solution A= 0.10M NaCl (aq) Solution B=0.01 M NaCl (aq)

-Solution A=0.20 M KCl (aq) Solution B= 0.20 M NaCl (aq)

-Solution A= 0.10 M NaHCO3 (aq) Solution B= 0.20 M NaHCO3 (aq)

particles undergoing diffusion move a few millimeters per hour. In reality, particles are traveling around 500 m/s. The slow overall movement is because they collide with other particles very frequently. (density of water =1000 kg/m^3, Avogadro's # = 6.022x10^23 particles/mole, mass of the earth =5.97 x10^24 kg) using Xrms = sqrt(2Dt)

a. Estimate how far a water molecule travels before colliding with another water molecule.

b. How much time is in between each collision?

c. How many collisions occur for a molecule that diffuses 1 mm in 1 hour? d. Use your estimates from a, b, and c to figure out how many times a water molecule moves away from its starting point and how many times it moves towards it to end up 1 mm away after 1 hour.

Assuming ideal behavior, which of the following aqueous solutions would be expected to exhibit the largest freezing-point lowering?

a. 0.1 m CaCl2

b. 0.05 m CH3COOH

c. 0.05 m Al2(SO4)3

d.0.1 m RbCl

The answer key I have says the answer is A, is that correct?

Calculate the diffusion coefficient of N₂ at 100 Pa, 100 kPa an 20 MPa (temperature T = 20 degrees celsius).

1.What will happen when you add ammonium hydroxide to sodium hydroxide?

2.Explain why acetic acid and sodium acetate can exist in an equilibrium but hydrochloric acid and sodium hydroxide cannot.

3.How will cobalts equilibrium with 1M HCL differ from its equilibrium with concentrated H2SO4?

Suppose two blocks of iron, each having 1 mol of iron atoms, are at differing temperatures and are then brought together in an otherwise isolated system. One of the blocks is at 273.15 K and the other is at 373.15 K and the process is carried out at 1 bar pressure.

a.) Would you expect ∆Ssys < 0, ∆Ssys = 0, ∆Ssys > 0 ?

b.) Using common sense and high school physics (and perhaps the First Law), what is the common final temperature of the two blocks?

c.) Calculate ∆Ssys for the process (use Table 4.1 for any needed molar heat capacities needed, and assume that the molar heat capacities are independent of T).

d.) What is q for the isolated system? How does this value of q and the result of part C relate to the Clausius inequality: final initial d q S T − ∆ ≥ ∫ ?

e.) Interpret this change in entropy in terms of the ordering-disordering effects involved in the transfer of given amount of heat from a block at higher temperature to one at a lower temperature (i.e. the disordering effect of adding a given q to the cooler block vs the ordering effect of removing the same q from the hotter block).

Molar heat capacity of Fe(s) ==> Cp,m (J / mol*K) = 25.1