Solute A has a distribution coefficient of 9.0 between methylene chloride and water. Show that extracting a solution containing 1.0 mole of A in 100. mL of water is more efficient if two 25 extractions with methylene chloride are performed rather than a single 50. mL extraction with methylene chloride.

steam saturated at 68.9 kPa (10 psia) is condensing on a vertical tube 1.22 m (4.0 ft) long having an OD of 0.0254 m (1.0 in.) and a surface temperature of 86.11 ºC (187 ºF). Calculate the average heat-transfer-coefficient using English and SI units.

Stock                  Amount                       Beta

A                         25,000                         0.2

B                         20,000                         1.0

C                         30,000                         1.8

D                         25,000                         1.6

Risk-free rate is 3% and the market risk premium is 8%.

If stock E with its beta of 0.6 and has an expected return of 8.2% should it be added to the portfolio?

Calculate the free-energy change for ammonia synthesis at 25 ? C(298 K) given the following sets of partial pressures:

a.1.0 atm N2, 3.0 atm H2, 0.020 atm NH3

b. 0.010 atm N2, 0.030 atm H2, 2.0 atm NH3

A buffered solution contains 0.25 M NH3 (Kb = 1.8 x 10-5 ) and 0.40 M NH4Cl.

a. Calculate the pH of this solution.

b. Calculate the pH of the solution that results when 0.20 mole of gaseous HCl is added to 1.0 L of the buffered solution from part a

calculate the pressure in both atm and mmHg exerted if 20.0 mL of 0.10 M HCl reacts with excess magnesium in a 125 mL flask at 298 K. What mass of magnesium reacts? What would be the pressure if 1.0 M HCl is used? Assume the magnesium occupies no volume.

The possible outcomes for the returns on Stock X and the returns on the market portfolio have been estimated as follows:

A) 2.1

B) 0.7

C) 1.0

D) none of the above

One cylinder in the diesel engine of a truck has an initial volume of 600cm3 . Air is admitted to the cylinder at 25?C and a pressure of 1.0 atm. The piston rod then does 300J of work to rapidly compress the air.

Final temperature was calulated to be 610 degree celcius.

What is the final volume?

The Carbondale Hospital is considering the purchase of ambulance. The TheXarbondale Hospital is considering the purchase of ambulance. The decision will rest partly on the anticipated mileage" be driven next year. The miles driven during the past 5
years are as follows:

a) Forecast the mileage for next year using a 2-year moving average.
b) Find the MAD based on the 2-year moving average forecast in part (a), (Hint: You will have only 3 years of matched data.)
c) Use a weighted 2-year moving average with weights of .4 and .6 to forecast next year's mileage. (The weight of .6 is for the most recent year.) What MAD results from using this approach to forecasting? (Hint: You will have only 3 years of matched data.)
d) Compute the forecast for year 6 using exponential smoothing, an initial forecast for year 1 of 3,000 miles, and a = .5.

*****PLEASE SHOW WORK

Round your answers to one decimal place.

1. What is the point estimate of the difference between the mean number of miles that Buffalo residents travel per day and the mean number of miles that Boston residents travel per day?

2. What is the 95% confidence interval for the difference between the two population means?