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Demonstrate your work. Remember to use the given letters to index your answers.

a) Hydrogen has a molar mass of 2.0 g/mol; oxygen has a molar mass of 32.0 g/mol. What is the ratio of their diffusion rates?

b) A mixture of oxygen, carbon dioxide, and nitrogen has a total pressure of 1.55 atm. What is the partial pressure of O2 if the partial pressure of CO2 is 0.70 and the partial pressure of N2 is 0.12 atm?

1. Solution A has [OH–] = 2.5 × 10–3. Solution B has [H3O+] = 3.5 × 10–4. In reference to the pH scale, which solution is more acidic?

5) NAU has 25,230 students. The New Student Association surveyed 400 incoming freshmen to find out more about their first semester schedules. 120 freshmen are enrolled in math, 220 are enrolled in English, and 55 are enrolled in both. Draw a Venn diagram to represent these results.

6) P( English)

7) P(Math English)

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lim (3 sec x - 3 tan x)

x->pi/2

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The number of visits to a website is known to have a Poisson distribution with a mean of 10 visits per minute.

(a) What is the probability distribution for x, the number of visits per minute? p(x) =       

(b) What is the probability that the number of visits per minute is less than or equal to 11? (Round your answer to three decimal places.)

(c) What is the probability that the number of visits per minute is greater than 15? (Round your answer to three decimal places.)

(d) Within what limits does Tchebysheff's Theorem suggest you would expect the number of visits to this website to lie at least 89% of the time? (Round your answer up to the nearest whole number.) 0 to  visits

According to a study conducted by a university, children who are injured seven or more times tend to sustain these injuries during a relatively limited time, usually 1 year or less. Let the average number of injuries per year for school-age children be seven.

(a) Calculate the mean and standard deviation for x, the number of injuries per year sustained by a school-age child. (Round your answers to three decimal places.) 𝜇=  injuries 𝜎=  injuries

(b) According to Tchebysheff's Theorem, within what limits would you expect the number of injuries per year to fall at least three-quarters of the time? (Round your answer up to the nearest whole number.) 1  injury to   injuries

The increased number of small commuter planes in major airports has heightened concern over air safety. An eastern airport has recorded a monthly average of nine near misses on landings and takeoffs in the past 5 years. (Round your answers to three decimal places.)

(a) Find the probability that during a given month there are no near misses on landings and takeoffs at the airport . 

(b) Find the probability that during a given month there are three near misses.

(c) Find the probability that there are at least three near misses during a particular month.

For the past several years, Emily Page has operated a part-time consulting business from her home. As of June 1, 2010, Emily decided to move to rented quarters and tooperate the business, which was to be known as Bottom Line Consulting, on a full-timebasis. Bottom Line Consulting entered into the following transactions during June:
June 1. The following assets were received from Emily Page: cash, $20,000; accounts receivable, $4,500; supplies, $2,000; and office equipment, $11,500. There were no liabilities received.
1. Paid three months’ rent on a lease rental contract, $6,000.
2. Paid the premiums on property and casualty insurance policies, $2,400.
4. Received cash from clients as an advance payment for services to be provided and recorded it as 
unearned fees, $2,700.
5. Purchased additional office equipment on account from Office Depot Co., $3,500.
6. Received cash from clients on account, $3,000.
10. Paid cash for a newspaper advertisement, $200.
12. Paid Office Depot Co. for part of the debt incurred on June 5, $750.
12. Recorded services provided on account for the period June 1–12, $5,100.
14. Paid part-time receptionist for two weeks’ salary, $1,100.
17. Recorded cash from cash clients for fees earned during the period June 1–16, $6,500.
18. Paid cash for supplies, $750.
20. Recorded services provided on account for the period June 13–20, $3,100.
24. Recorded cash from cash clients for fees earned for the period June 17–24, $5,150.
26. Received cash from clients on account, $6,900.
27. Paid part-time receptionist for two weeks’ salary, $1,100.
29. Paid telephone bill for June, $150.
30. Paid electricity bill for June, $400.
30. Recorded cash from cash clients for fees earned for the period June 25–30, $2,500.
30. Recorded services provided on account for the remainder of June, $1,000.
30. Emily withdrew $5,000 for personal use.



Instructions
1. Journalize each transaction in a two-column journal, referring to the following chartof accounts in selecting the accounts to be debited and credited. (Do not insert theaccount numbers in the journal at this time.)
11 Cash    31 Emily Page, Capital
12 Accounts Receivable   32 Emily Page, Drawing
14 Supplies     41 Fees Earned
15 Prepaid Rent    51 Salary Expense
16 Prepaid Insurance    52 Rent Expense
18 Office Equipment    53 Supplies Expense
19 Accumulated Depreciation   54 Depreciation Expense
21 Accounts Payable    55 Insurance Expense
22 Salaries Payable    59 Miscellaneous Expense
23 Unearned Fees

2. Post the journal to a ledger of four-column accounts.
3. Prepare an unadjusted trial balance.
4. At the end of June, the following adjustment data were assembled. Analyze and use these data to 
complete parts (5) and (6).
a. Insurance expired during June is $200.
b. Supplies on hand on June 30 are $650.
c. Depreciation of office equipment for June is $250.
d. Accrued receptionist salary on June 30 is $220.
e. Rent expired during June is $2,000.
f. Unearned fees on June 30 are $1,875.
5. Journalize and post the adjusting entries.
6. Prepare an adjusted trial balance.
7. Prepare an income statement, a statement of owner’s equity, and a balance sheet.
8. Prepare and post the closing entries. (Income Summary is account #33 in the chart of accounts.) 
Indicate closed accounts by inserting a line in both the Balance columns opposite the closing entry.
9. Prepare a post-closing trial balance.

What functions do carbohydrates perform in living organisms?

A mixture of 45 mole % n-hexane and 55 mole % n-heptane is subjected to continuous fraction in a tray column at 1 atm total pressure. The distillate contains 90% n-hexane and the residue contains 10% n-hexane. The feed is saturated vapour. The relative volatility of n-hexane in mixture is 2.56. Determine the minimum reflux ratio for this separation.

What is Arrays in Data Structure , Declaration, Initialization & Memory representation?

Explain structure of eye

1. Highlight or underline details on page 2 that describe the differences between Yousafzai’s work and that of the Taliban.

1. Mark or highlight details that demonstrate Yousafzais belief in the power of education to do good.

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When would a person need to be solicitous

in a farm there is 30 heads and 86 feets how many cows and chicken is in a farm

Who is John Milton?

Do you think society forces us to assimilate into mainstream American culture ?

Do you think society forces us to assimilate into mainstream American culture? Explain why

1. Jane has written fourteen articles for the newspaper in the past year. Would you say that she has been prolific in her output?

Do outside influences identify who you are ?

Subject-civics

Petition Project: You belong to an imaginary territory that is part of the land mass you know as "The Northwest Territories." (you can think up your own name). Your territory desires to be admitted into the United States of America.

• You must create a petition in a Word document requesting admittance to the Union based upon the requirements described in the Northwest Ordinance (1787)--see link above. In that petition, you must explain to Congress how your territory has satisfied all the requirements (for instance: how did you come up with the population number? don't just say you've reached that magical figure.)

• Part of that petition is a draft of your state's future constitution. You only need create the "preamble." Below are links to the preambles of the listed states' original constitution. Your preamble should resemble them in tone and language.

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What is Artificial intelligence