A CI is desired for the true average stray-load loss μ (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with σ = 2.3. (Round your answers to two decimal places.)

(a) Compute a 95% CI for μ when n = 25 and x = 54.6.
(____, ____) watts

(b) Compute a 95% CI for μ when n = 100 and x = 54.6.
(____, ____) watts

(c) Compute a 99% CI for μ when n = 100 and x = 54.6.
(____, ____) watts

(d) Compute an 82% CI for μ when n = 100 and x = 54.6.
(____, ____) watts

(e) How large must n be if the width of the 99% interval for μ is to be 1.0? (Round your answer up to the nearest whole number.)
n = ___

Assume that Samsung of South Korea obtains all inputs  from South Korean suppliers whose costs are denominated in won. Also assume that the company has the cost structure shown in the table below to manufacture cell phones. If the won appreciates from ₩1,200/$ to ₩1,000/$ what is the new dollar cost of a Samsung phone?

If wheat costs $4 per bushel in the United States and 2 British pounds per bushel in Great Britain, then in the presence of purchasing-power parity the exchange rate should be:

In Chapter 6I of Analytical Chemistry 2.1, the author shows two beakers in Figure 6.15 on pg. 242: One is filled with a relatively dark orange iron (III) thiocyanate complex, and one with added supporting electrolyte, resulting in a lighter colored iron (III) thiocyanate complex. The determination of the equilibrium constant for the formation of the iron (III) thiocyanate complex, often performed in general chemistry lab, is shown in the following reaction:

Fe³⁺_(aq) + SCN^–_(aq) ↔ FeSCN²⁺_(aq)

The concentration-based formation constant for this reaction (μ = 1.0 M) has been reported to be 113. Determine the thermodynamic formation constant for the iron (III) thiocyanate complex and support your answer by relating it to the experimental observation in Figure 6.15 on page 242. Assume that the hydrated ion diameter for FeSCN²⁺ is 0.20 nm.

Analytical Chemistry 2.1

http://dpuadweb.depauw.edu/harvey_web/eTextProject/version_2.1.html

A buffer solution is made from partially neutralizing hypochlorous acid with sodium hydroxide; the K_a of HClO is 3.5 x 10^-8. use the Henderson-Hasselbalch equation.

A). if 50 mL of 1.0 M HClO is used to make the buffer, what volume of .50 M NaOH is needed for the final pH of the buffer to be equal to the pK_a of the acid?

B). Assuming no density change upon mixing, what are the concentrations of the weak acid (HClO) and its conjugate base (ClO^-) of this buffer.

C) if 20 mL of the buffer solution made in (a) is diluted to a new volume of 200 mL, what will be the new pH? explain why.

D) Comparing the two buffer solutions made in (a) and (c), which has higher buffing capacity if equal volumes of each are used? explain why.

E). Calculate the pH of a buffer made using 30 mL of the acid and 10 mL of the base.

A CI is desired for the true average stray-load loss μ (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with σ = 2.3. (Round your answers to two decimal places.)

(a) Compute a 95% CI for μ when n = 25 and x = 59.6.

  ,

watts

(b) Compute a 95% CI for μ when n = 100 and x = 59.6.

  ,

watts

(c) Compute a 99% CI for μ when n = 100 and x = 59.6.

  ,

watts

(d) Compute an 82% CI for μ when n = 100 and x = 59.6.

  ,

watts

(e) How large must n be if the width of the 99% interval for μ is to be 1.0? (Round your answer up to the nearest whole number.)
n =

A CI is desired for the true average stray-load loss μ (watts) for a certain type of induction motor when the line current is held at 10 amps for a speed of 1500 rpm. Assume that stray-load loss is normally distributed with σ = 2.2. (Round your answers to two decimal places.)

(a) Compute a 95% CI for μ when n = 25 and x = 53.8.

  ,

watts

(b) Compute a 95% CI for μ when n = 100 and x = 53.8.

  ,

watts

(c) Compute a 99% CI for μ when n = 100 and x = 53.8.

  ,

watts

(d) Compute an 82% CI for μ when n = 100 and x = 53.8.

watts

(e) How large must n be if the width of the 99% interval for μ is to be 1.0? (Round your answer up to the nearest whole number.)
n =

A chemist decomposes several samples of water into hydrogen and oxygen gas and determines the mass of the hydrogen and oxygen obtained.

Sample Number    Grams of Hydrogen        Grams of Oxygen

1                                 1.5                                      12.0

2                                  2.0                                      16.0

3                                  2.5                                      20.0

Summarize these observations in a short statement.

Next the chemist decomposes several samples of carbon dioxide into carbon and oxygen. Again, she determines the mass of each gas produced.

Sample Number    Grams of Carbon    Grams of Oxygen    Ratio (C to O)

1                                 0.5                              1.3                               0.385

2                                 1.0                              2.7                               0.37

3                               1.5                              4.0                               0.375

b.      Summarize these observations in a short statement.

c.       Formulate a law from the observations in (a) and (b).

d.    Formulate a theory that might explain your law in (c).

d.    Formulate a theory that might explain your law in (c).

For a diatomic molecule with a rotational constant B=1.656x10¹¹ s^-1 and a reduced mass µ=4.00x10^-27 kg, the equilibrium bond length, R_e, can be calculated to be (in Å or 10^-10 m):

1.28

2.26

3.39

1.13

2.56

If two molecules A-B and C-D have the same force constant and the reduced mass of A-B is 4 times that of C-D, the vibrational frequency of C-D should be __X__time that of A-B:

1/2

1

1/4

2

4

For a chemical reaction starting with only one reactant A producing product P , the half-life t_1/2 is found to be 0.10 s and the rate constant k was found to be 5.0 M/s for an initial concentration [A]₀=1.0 M. This means that the reaction is:

not possible to determine

second order

first order

zeroth order

A ball of clay with a mass of 4.0 kg, starting from rest, falls from a height of 0.20 m above a block with mass 1.0 kg that rests on top of a spring with spring constant 90 N/m. The block then sticks to the block and the system undergoes simple harmonic motion. Please submit your answers to the following questions on a separate sheet of paper (or multiple sheets of paper).

i. Write the formulas for the position, velocity, and acceleration as functions of time, with t = 0 corresponding to the moment that the ball hits the spring. Sketch graphs for each quantity over the first three cycles of the oscillations. Pay careful attention to where in the cycle the system’s oscillation starts.

ii. Write formulas for the kinetic energy and the total mechanical energy of the system as functions of time. Sketch graphs for each quantity over the first three cycles of the oscillations.

Use data from the table below to calculate the equilibrium constants at 25 ∘C for each reaction.

Standard Thermodynamic Quantities for Selected Substances
at 25∘C

Part A

2NO2(g)⇌N2O4(g)

Find K

Part B

Br2(g)+Cl2(g)⇌2BrCl(g)
ΔG∘f for BrCl(g) is -1.0 kJ/mol

Find K