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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 />

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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

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Answer:

D oxide

Explanation:

Hope this helped!

4 0
2 years ago
What causes pressure inside a helium balloon?
kupik [55]

Explanation:

So the gas pressure of a helium balloon arises from the impact of the collisions of the helium atoms between themselves and with the inside surface of the balloon. Of course, the outside atmosphere similarly exerts a pressure on the outside of the balloon.

7 0
3 years ago
Which element has the lowest first ionization energy? (F), (Li), (Fr), (Rb)?
Mariulka [41]

Answer:

Fr

Explanation:

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6 0
3 years ago
Maggie has 4 binders with 30 stamps in each binder. She has 3 binders with 36 baseball cards in each binder. If she gives away 4
Sliva [168]

Answer:

The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183

Explanation:

If Maggie gives 45 stamps to a friend, you must calculate the number of stamps and cards she has left.

You know Maggie has 4 folders with 30 stamps in each folder. So the number of stamps she owns is calculated as:

4 folders*30 stamps in each folder= 120 stamps

If Maggie gives 45 stamps to a friend, then the number of stamps she has left will be calculated as the difference (the subtraction) between the stamps she owned and the ones she gives away:

120 stamps - 45 stamps= 75 stamps

On the other hand, she has 3 binders with 36 baseball cards in each binder. So the number of cards she owns is calculated as:

3 binders * 36 baseball cards in each binders= 108 baseball cards

The number of stamps and cards you have left is calculated as:

75 stamps + 108 baseball cards= 183

<em><u>The number of stamps and cards Maggie has left if she gives 45 stamps to a friend is 183</u></em>

4 0
2 years ago
If I want to lower the volume (loudness) I can do which of the following. Select all that apply.
nirvana33 [79]

Sound travels in waves and the height of the wave is the loudness of the sound.

To decrease sound, you need to make the waves not so high, so you can

- decrease the amplitude

- decrease the height of the crest   (lower the top of the wave down)

- increase the height of the trough  (bring the bottom of the wave up)

It's all about getting the wave to be closer to the center, to not be so high and low, but to be flatter.

(picture taken from sound . eduation website)

6 0
3 years ago
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