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
What causes the Moon to revolve around Earth?
Mama L [17]

Answer:

A, Earth Gravity

Explanation:

7 0
2 years ago
Read 2 more answers
Comparison between alkyl nucleophilic substitution with acyl nucleophilic substitution
S_A_V [24]

Answer:

in both nucleophil attach the c and leaving group leave but in acyl nu. subsituation c of carbonyl because of double bond with o have bigger positive charge and is better electrophil so do it faster,also alkyl nu. subsituation can have rearangment if going from sn1 and in sn2 sterichemistry of molecule change , acyl nu. subsituation most of time is better

4 0
3 years ago
Which metal will more easily lose an electron sodium or potassium?
sergey [27]
<span>The metal that would more easily lose an electron would be potassium. It is more reactive than sodium. Also, looking on the periodic table, </span><span>from top to bottom for groups 1 and 2, reactivity increases. So, it should be potassium. Hope this answers the question. Have a nice day.</span>
7 0
3 years ago
In the reaction N2 + 3H2 → 2NH3, what is the mole ratio of hydrogen to nitrogen?
uranmaximum [27]

Answer: The mole ratio of hydrogen to nitrogen is 3 mole: 1 mole, 3:1

Explanation:

•Mole ratios are determined using the coefficients of the substances in the balanced chemical equation. •Each coefficient represents the number of mole of each substance in the chemical reaction.

•The mole ratio can be determined by first writing out a balanced chemical equation for the reaction.

For this reaction the balanced chemical equation is

N2(g) + 3H2(g) ----> 2NH3(g)

1mol:3mol : 2mol

From the equation we can see that 1 mole of N2(g) reacts with 3 moles of H2(g) or 3 moles of H2(g) react with 1 mole of N2(g) to produce 2 moles of NH3(g).

Therefore, the mole ratio of hydrogen to nitrogen is 3 mole: 1 mole, 3:1

7 0
3 years ago
Boron is to the immediate left of carbon in the same row in the periodic table. Which of the following statements compares the r
natita [175]

Answer:

Boron has a larger radius and the protons in carbon exert more pull.

Explanation:

Remember than elements have greater radius as they are closer to the bottom left corner, so boron would have the larger radius here. Carbon has a smaller radius, which makes it easier for the protons in carbon to exert more pull.

7 0
3 years ago
Read 2 more answers
Other questions:
  • Because the light rays never meet, a concave lens can produce
    6·1 answer
  • Calculate the m/m% of casein in the milk sample:​
    9·1 answer
  • The empirical formula for two compounds that have very different properties (one tastes very sour and the other very sweet) is c
    12·2 answers
  • Who established atomic numbers as the basis for organizing the periodic table?
    6·1 answer
  • . When it comes to calculating slope, what does this image represent?
    15·1 answer
  • What is the importance of a chemical symbol?
    10·2 answers
  • How many moles of Mg(OH)2(aq) would be required to neutralize 6.0 mol HCl(aq)?
    9·1 answer
  • An atom has 19 protons and 20 neutrons. what is the atomic number with steps​
    5·2 answers
  • What does not add co2 to the atmosphere
    11·1 answer
  • The diagram below shows three types of earthquake waves, labeled A, B, and C at different time intervals.
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!