1.Calculate the pH of a buffer solution that is 0.249 M in HCN and 0.175 M in KCN. For HCN, Ka = 4.9×10⁻¹⁰ (pKa = 9.31).

2.Calculate the pH of a buffer solution that is 0.210 M in HC2H3O2 and 0.200 M in NaC2H3O2. (Ka for HC2H3O2 is 1.8×10−5.)

3.Consider a buffer solution that is 0.50 M in NH3and 0.20 M in NH4Cl. For ammonia, pKb=4.75. Calculate the pH of 1.0 L of the original buffer, upon addition of 0.020 mol of solid NaOH.

4.A 1.0-L buffer solution contains 0.100 mol HC2H3O2 and 0.100 mol NaC2H3O2. The value of Ka for HC2H3O2 is 1.8×10−5.

Calculate the pH of the solution, upon addition of 0.065 mol of NaOH to the original buffer.

5.Calculate the pH of the buffer that results from mixing 56.3 mL of a 0.292 M solution of HCHO2 and 20.0 mL of a 0.734 M solution of NaCHO2. The Ka value for HCHO2 is 1.8×10−4.

6.Consider a buffer solution that is 0.50 M in NH3and 0.20 M in NH4Cl. For ammonia, pKb=4.75. Calculate the pH of 1.0 L of the solution, upon addition of 10.00 mL of 1.0 MHCl.

7.A 1.0-L buffer solution contains 0.100 molHC2H3O2 and 0.100 molNaC2H3O2. The value of Ka for HC2H3O2 is 1.8×10−5. Calculate the pH of the solution upon addition of 78.9 mL of 1.00 MHCl to the original buffer.

The dataset in the file Lab11data.xlsx contains data on Crimini mushrooms. The factor variable is the weight of the mushroom in grams and the response variable is the total copper content in mg. 1. Plot Copper vs. Weight and describe. 2. Find least squares regression line and interpret slope in the words of the problem. 3. Find the coefficient of determination (R2) and interpret in context. 4. Find the correlation coefficient (R) and interpret in context. 5. Find and interpret a 95% Confidence Interval for the true slope. 6. Find the predicted values for Weights of 12.1, 15.8, 19.7. 7. Find the residuals values for Weights of 12.1, 15.8, 19.7. 8. Graph the standardized residuals vs. predicted values (x-axis). Describe and comment. 9. Graph the predicted values vs. the actual accuracy values (x-axis). Describe and comment.

Why are astronomical distances not measured with standard referent units of distance such as kilometers or miles?

What is Miles & Snow’s typology? Apply this concept to an Omani company of your choice?

One of the major problems with front office accounting at the Royal Crest Hotel is monitoring guest and non-guest accounts using their manual system. Management has always extended local businesses and government officials charge privileges, the idea being that, with the convenience of deferred payments, local patrons would be more likely to dine and/or host clients at the hotel. This program has proved to be highly successful. The volume of purchases charged to such non-guest accounts now approximates the level of sales incurred by registered guests. Unsure if this is a good or bad situation, Mr. Osei, the front office manager, requests the front office accounting staff to study the problem and to report its findings at next week's front office meeting. At the weekly front office meeting, the hotel's accountant, Ms. Pokua, reports that there are at least three problems related to the hotel's non- guest charge purchasing policies: its impact on the daily hotel audit, the billing procedures to collect payment, and the number of applications for additional non-guest accounts. When asked to be more specific, she begins with a review of the daily hotel audit. She states that since the front office receives charge vouchers from the hotel's revenue centers, it is the front desk agent's responsibility to separate guest from non-guest accounts. Since registered guest charges are posted by room number, one would think it easy to sort those charges from the others. Unfortunately, both the hotel's guest account numbers and the non-guest account numbers are three digits, thereby making the sorting more time-consuming. Mr. Osei asks if it is really necessary to separate the charges. Ms. Pokua explains that it is, since the hotel must maintain accurate guest folio Page 2 of 1 G. N. Baah balances. She further states that the non-guest vouchers are accumulated and posted on Saturday afternoons, when the hotel's business is less hectic. The billing procedures to collect non-guest account balances are tricky, Ms. Pokua said. Since the hotel bills non-guest accounts on the last day of each month, some charges occurring in a particular month may not be posted in time to appear on that month's bill. In addition, non-guest accounts usually are not paid in time. In fact, 47 percent of last month's non-guest account balances remain unpaid and tomorrow is the date of the next billing cycle. Mr. Osei explains that the local customers are important to the hotel and suggests that maybe Ms. Pokua is over-sensitive to the billing problems. Lastly, Ms. Pokua relates the fact that there are at least ten new applications for non-guest accounts. She has instructed her staff not to authorize any new non-guest accounts without her written approval. She further states that she is reluctant to authorize any additional non-guest accounts, and looks to Mr. Osei for advice. Convinced of the positive aspects of such business, Mr. Osei directs her to approve the requests and to assign account numbers effective the first day of next month. Ms. Pokua so instructs her staff. a. What ideas (any two) would you suggest to facilitate a more effective processing of guest and non- guest charge vouchers? b. How might the daily audit be aided by such changes? c. Is the accumulated-postings routine for non-guest accounts an effective plan? Explain your response. d. What could be done to improve the hotel's billing of non-guest accounts? e. What could be done to improve collection of outstanding balances? State any four (4). f. What are the two (2) advantages and two (2) disadvantages to having a high volume of non- guest accounts? NOTE; PLEASE I NEED DIFFERENT ANSWERS.

1. Consider a city in which urban density averages five housing units per acre. The city is fully circular with the CBD at the center. The distance between CBD and the city border is 30 miles. Land at 10 miles from CBD costs $500,000 per acre and land at 20 mile from CBD costs $300,000. Calculate annual transportation cost per mile assuming the city is currently neither growing nor shrinking.

he following table gives the frequency distribution of the total miles
driven during 2015 by a sample of 92 car owners.
Miles Driven (in thousand) Frequency
0 to less than 5 7
5 to less than 10 26
10 to less than 15 59
(a) (3 points) Write down the columns that show the values for m, mf
and m2
f. Then compute the sample mean and the sample standard
deviation for the given data.

As we discussed in our class the notion of organizational culture, structure and styles of management from the perspectives of Handy’s (1976) and Miles & Snow (1978). These authors provided their frameworks that are different from each other’s. What you have to do: Take an organization with which you are familiar or imaginary organization and evaluate & relate or apply Handy’s and Miles & Snow’s typologies (scientific/logical classification/steps of organizational culture, structure and styles) that they provided in their approaches or framework.