1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Inga [223]
3 years ago
5

Using the Ideal Gas Law or any of the equations you found in questions A-­‐D, answer the following questions about gases. Assume

ideal behavior! Be sure to put all values into the SI units (pressure in atm, the temperature in K, volume in L).
Useful Conversion Factors and the Gas Constant:
Quantity

Pressure
1 atm = 760 torr
1 atm = 101 kPa
1 mmHg= 1 torr
Gas Constant R=0.0821 L*atm/mol*K

1. A rigid container (25 mL) filled with oxygen gas has a pressure of 699 torr at a temperature of 25oC. How many moles of oxygen are in the container?

2. A 57.8-­‐mL sample of gas in a cylinder is warmed from 20oC to 120oC. What is the volume at the final temperature?

Part II. Stoichiometry with Gaseous Reactants/Products
We now have a new way to find the moles of a compound! If a chemical is in the gaseous state, it is pretty hard (read: impossible) to measure the mass of the gas on a balance. Therefore, to determine the number of moles of a gaseous reactant (or product) in a chemical reaction, scientists measure the temperature, pressure, and volume of the gas. Using PV=nRT allows us to calculate the number of moles-­‐ now ‘n’ can be used just like we always use it!

1. How many grams of Li3N can form when the following chemicals are allowed to react according to the reaction below? Excess solid Li reacts with 50 mL of nitrogen gas (1.23 atm, 293 K).

6 Li (s) + N2 (g) --> 2 Li3N (s)
Chemistry
2 answers:
Licemer1 [7]3 years ago
8 0
Step by step equation
nadya68 [22]3 years ago
7 0

Answer:

1. <u>0.000940 moles oxygen</u>

<u>2.  </u>The new volume is 77.5 mL

3. 17.83 grams Li3N

Explanation:

1. A rigid container (25 mL) filled with oxygen gas has a pressure of 699 torr at a temperature of 25oC. How many moles of oxygen are in the container?

p*V = n*R*T

n = (p*V)/R*T

⇒with n = the number of moles oxygen = TO BE DETERMINED

⇒with p = the pressure of gas = 699 torr = 699/760 atm = 0.919737 atm

⇒with V = the volume of gas = 25 mL = 0.025 L

⇒with R = the gas constant = 0.08206 L*atm /mol*K

⇒with T = the temperature = 25 °C = 298 K

n = (0.919737*0,025)/(0.08206*298)

n = <u>0.000940 moles oxygen</u>

<u />

<u />

<u />

A 57.8-­‐mL sample of gas in a cylinder is warmed from 20oC to 120oC. What is the volume at the final temperature?

V1/T1 = V2/T2

⇒with V1 = the initial volume = 57.8 mL = 0.0578 L

⇒with T1 = the initial temperature = 20°C = 293 K

⇒with V2 = the final volume = TO BE DETERMINED

⇒with T2 = the final temperature = 393 K

0.0578 L / 293 K = V2 / 393 K

V2 = (0.0578 / 293) * 393

V2 = 0.0775 L = 77.5 mL

The new volume is 77.5 mL

How many grams of Li3N can form when the following chemicals are allowed to react according to the reaction below? Excess solid Li reacts with 50 mL of nitrogen gas (1.23 atm, 293 K).

6 Li (s) + N2 (g) --> 2 Li3N (s)

p*V = n*R*T

n = (p*V)/(R*T)

⇒with n = the moles of nitrogen gas = TO BE DETERMINED

⇒with p= the pressure of nitrogen gas = 1.23 atm

⇒with V = the volume of nitrogen gas = 0.050 L

⇒with R = the gas constant = 0.08206 L*atm/mol*K

⇒with T = the temperature = 293 K

Moles nitrogen gas = (1.23 * 0.050) / (0.08206*293)

Moles nitrogen gas (N2) = 0.00256 moles

For 6 moles of Li we need 1 mol N2 to produce 2 moles Li3N

For 0.00256 moles N2 we'll have 2*0.00256 = 0.00512 moles Li3N

Mass Li3N = moles Li3N * molar mass Li3N

Mass Li3N = 0.00512 moles * 34.83 g/mol

Mass Li3N = 17.83 grams Li3N

You might be interested in
Heroin was originally going to be called "wunderlich", a German word for wonderful, since one chemist thought the substance made
Zarrin [17]

Answer:

heroic

Explanation:

Bayer, a German pharmaceutical company, named the substance it synthesized "heroin", probably from the word heroisch, German for heroic, because in field studies people using the medicine felt "heroic".

BTW, I found this information on this wedsite: https://www.answers.com/Q/Where_did_heroin_get_its_name

Also, if you want some more history about this drug, you can visit this article: https://www.narconon.org/drug-information/heroin-history.html

5 0
3 years ago
Matthew has been collecting quarters in a jar. He has 176 quarters. What is the value of the coins in his jar?
AURORKA [14]

Answer:

The correct answer is : 44 dollars.

Explanation:

A quarter is one fourth of a dollar that is the reason it is known as quarter. A quarter is 25 cents or 0.25 dollar in value. If Matthew has 176 quarters in his jar than the value of the total coins would be:

1 quarter = 0.25 dollar

1 quarter = 1/4 dollar.

4 quarter = 1 dollar

then, 176 / 4 = x dollar

 = 44 dollar

Thus, The correct answer is : 44 dollars.

3 0
3 years ago
What is primarily responsible for holding two nitrogen atoms together in a molecule of nitrogen gas?
kotykmax [81]

The answer is B Nitrogen atoms will form three covalent bonds (also called triple covalent) between two atoms of nitrogen because each nitrogen atom needs three electrons to fill its outermost shell. Another example of a nonpolar covalent bond is found in the methane (CH4) molecule.

7 0
3 years ago
Read 2 more answers
What is monochromatic light
Alecsey [184]
Monochromatic light literally means Light of one color.
8 0
3 years ago
Read 2 more answers
What is the energy of the photons of a laser with a frequency of 5.75 x 10^12 Hz? (Hint: Remember to round your answer to the lo
Simora [160]

Answer:

E = 3.81×10 ⁻²¹ J

Explanation:

Given data:

Frequency of photon = 5.75 ×10¹² Hz

Plancks constant = 6.626 ×10⁻³⁴ Js

Energy of photon = ?

Solution:

E = h×f

E = 6.626 ×10⁻³⁴ Js ×  5.75 ×10¹² s⁻¹

E = 38.1×10 ⁻²² J

E = 3.81×10 ⁻²¹ J

8 0
2 years ago
Other questions:
  • How many co2 molecules are generated from each pyruvate molecule that enters the mitochondrial matrix?
    13·1 answer
  • How do the ions in metals behave?
    11·1 answer
  • Fill in the blank:<br><br> Aspirin is a ____ of materials.
    15·1 answer
  • When a cell divides in asexual reproduction what type of cell division is it? *
    8·2 answers
  • In the electron cloud model, the electron cloud is denser in some locations than in others. What do the denser areas represent?
    6·2 answers
  • Classify each element. Note that another term for main group is representative, another term for semimetal is metalloid, and the
    10·1 answer
  • What are some ways to prevent heat energy loss in matter?
    12·2 answers
  • Cho biết độ tan của NH4Cl trong nước ở 20oC và 70oC lần lượt là 37,2 g/100 gam nước và 60,2 gam/100 g nước. Hòa tan 166,8 gam NH
    15·1 answer
  • Is industry pool or flux
    14·1 answer
  • A 250 mL sample of gas is collected over water at 35°C and at a total pressure of 735 mm Hg. If the vapor pressure of water at 3
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!