Chemistry Assignment Guruh Worksheet

NI 2

ENGR 1540 Worksheet 21 Chapter 5

1. During a collision, automobile air bags are inflated by the N2 gas formed by the explosive decomposition of sodium azide, NaN3: 2NaN3→2Na+3N2 What mass of sodium azide would be needed to inflate a 30.0-L bag to a pressure of 1.40 atm at 25℃?

2. You want to store 165 g of CO2 gas in a 12.5-L tank at room temperature (25℃). Calculate the pressure the gas would have using
a. the ideal gas law
b. the van der Waals equation
(For CO2, a=3.59 atm L2/mol2 and b=0.0427 L/mol.)

3. Liquid oxygen for use as a rocket fuel can be produced by cooling dry air to -183℃, where the O2 condenses. How many liters of dry air at 25℃ and 750 torr would need to be processed to produce 150 L of liquid O2 at -183℃? (The mole fraction of oxygen in dry air is 0.21, and the density of liquid oxygen is 1.14 g/mL.)

4. A number of compounds containing the heavier noble gases, and especially xenon, have been prepared. One of these is xenon hexafluoride (XeF6), which can be prepared by heating a mixture of xenon and fluorine gases. XeF6 is a white crystalline solid at room temperature and melts at about 325 K. A mixture of 0.0600 g of Xe and 0.0304 g of F2 is sealed into a 100.0-mL bulb. (The bulb contains no air or other gases.) The bulb is heated, and the reaction goes to completion. Then the sealed bulb is cooled back to 20.0℃. What will be the final pressure in the bulb, expressed in torr?

5. You work in a semiconductor production plant that relies on several chlorofluorocarbons in its manufacturing process. One day, you find an unlabeled gas cylinder, and you are assigned to figure out what is in the tank. First, you fill a 1.000-L flask with the gas. At a pressure of 250.0 torr and a temperature of 25.00℃, you determine that the mass of the gas in the flask is 2.2980 g. Then, you send the flask to an outside lab for elemental analysis, and they report that the gas contains 14.05% C, 44.46% F, and 41.48% Cl by mass. Find the molecular formula of this gas.

6. A 0.2500-g sample of an Al-Zn alloy reacts with HCl to form hydrogen gas:
2Al(s)+6H+(aq)→Al3+(aq)+3H2(g)
Zn(s)+2H+(aq)→Zn2+(aq)+H2(g)
The hydrogen produced has a volume of 0.1447 L at 25℃ and 755 mm Hg. What is the percentage of zinc in the alloy?

7. A mixture of Ar (0.40 mol), O2 (0.50 mol), and CH4 (0.30 mol) exerts a pressure of 740 mm Hg. If the methane and oxygen are ignited and complete combustion occurs, what is the final pressure of Ar, CO2, H2O, and the remainder of the excess reactant? What is the total pressure of the system?
8. The complete combustion of octane can be used as a model for the burning of gasoline: 2C8H18+25O2→16CO2+18H2O Assuming that this equation provides a reasonable model of the actual combustion process, what volume of air at 1.0 atm and 25℃ must be taken into an engine to burn 1 gallon of gasoline? (The partial pressure of oxygen in air is 0.21 atm, and the density of liquid octane is 0.70 g/mL.)

9. Mining engineers often have to deal with gases when planning for the excavation of coal. Some of these gases, including methane, can be captured and used as fuel to support the mining operation. For a particular mine, 2.4 g of CH4 is present for every 100.0 g of coal that is extracted. If 4 5.6% of the methane can be captured and the daily production of the mine is 580 metric tons of coal, how many moles of methane could be obtained per day?

10. Some engineering designs call for the use of compressed air for underground work. If water containing iron(II) ions is present, oxygen in the compressed air may react according to the following unbalanced net ionic equation: Fe2++H++O2→Fe3++H2O
a. Write the balanced net ionic equation. Remember that the amounts of each substance and the charges must balance.
b. Assume all of the oxygen from 650 L of compressed air at 15℃ and 6.5 atm is lost by this reaction. What mass of water would be produced? (The mole fraction of oxygen in air is about 0.21.)
c. What will be the final pressure after the loss of the oxygen?

Place your order
(550 words)

Approximate price: $22

Calculate the price of your order

550 words
We'll send you the first draft for approval by September 11, 2018 at 10:52 AM
Total price:
$26
The price is based on these factors:
Academic level
Number of pages
Urgency
Basic features
  • Free title page and bibliography
  • Unlimited revisions
  • Plagiarism-free guarantee
  • Money-back guarantee
  • 24/7 support
On-demand options
  • Writer’s samples
  • Part-by-part delivery
  • Overnight delivery
  • Copies of used sources
  • Expert Proofreading
Paper format
  • 275 words per page
  • 12 pt Arial/Times New Roman
  • Double line spacing
  • Any citation style (APA, MLA, Chicago/Turabian, Harvard)

Our guarantees

Delivering a high-quality product at a reasonable price is not enough anymore.
That’s why we have developed 5 beneficial guarantees that will make your experience with our service enjoyable, easy, and safe.

Money-back guarantee

You have to be 100% sure of the quality of your product to give a money-back guarantee. This describes us perfectly. Make sure that this guarantee is totally transparent.

Read more

Zero-plagiarism guarantee

Each paper is composed from scratch, according to your instructions. It is then checked by our plagiarism-detection software. There is no gap where plagiarism could squeeze in.

Read more

Free-revision policy

Thanks to our free revisions, there is no way for you to be unsatisfied. We will work on your paper until you are completely happy with the result.

Read more

Privacy policy

Your email is safe, as we store it according to international data protection rules. Your bank details are secure, as we use only reliable payment systems.

Read more

Fair-cooperation guarantee

By sending us your money, you buy the service we provide. Check out our terms and conditions if you prefer business talks to be laid out in official language.

Read more
error: Content is protected !!
Open chat
1
You can contact our live agent via WhatsApp! Via + 1 929 473-0077

Feel free to ask questions, clarifications, or discounts available when placing an order.

Order your essay today and save 30% with the discount code GURUH