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
Oxana [17]
2 years ago
8

A student weighs an empty flask and stopper and finds the mass to be 55.844 g. She then adds about 5 mL of an unknown liquid and

heats the flask in a boiling water bath at 99.7 degrees C. After all the liquid is vaporized, she removes the flask from the bath, stoppers it, and lets it i s cool. After it is cool, she momentarily removes the stopper, then replaces it and weighs the flask and condensed vapor, obtaining a mass of 56.101 g. The volume of the flask is known to be 248.1 mL. The barometric pressure in the laboratory 752 mm. Hg. a. What was the pressure of the vapor in the flask atm? P = ______ amt b. What was the temperature of the vapor in K? the volume of the flask in liters? T =______K, V=______ L c. What was the mass of vapor that was present in the flask? g = ___________grams d. How many moles of vapor are present? n =___________grams e. What is the mass of one mole of vapor? MM=___________g/mole
Chemistry
1 answer:
Oduvanchick [21]2 years ago
8 0

Answer :

(a) The pressure of the vapor in the flask in atm is, 0.989 atm

(b) The temperature of the vapor in the flask in Kelvin is, 372.7 K

    The volume of the flask in liters is, 0.2481 L

(c) The mass of vapor present in the flask was, 0.257 g

(d) The number of moles of vapor present are 0.00802 mole.

(e) The mass of one mole of vapor is 32.0 g/mole

Explanation : Given,

Mass of empty flask and stopper = 55.844 g

Volume of liquid = 5 mL

Temperature = 99.7^oC

Mass of flask and condensed vapor = 56.101 g

Volume of flask = 248.1 mL

Barometric pressure in the laboratory = 752 mmHg

(a) First we have to determine the pressure of the vapor in the flask in atm.

Pressure of the vapor in the flask = Barometric pressure in the laboratory = 752 mmHg

Conversion used :

1atm=760mmHg

or,

1mmHg=\frac{1}{760}atm

As, 1mmHg=\frac{1}{760}atm

So, 752mmHg=\frac{752mmHg}{1mmHg}\times \frac{1}{760}atm=0.989atm

Thus, the pressure of the vapor in the flask in atm is, 0.989 atm

(b) Now we have to determine the temperature of the vapor in the flask in Kelvin.

Conversion used :

K=273+^oC

As, K=273+^oC

So, K=273+99.7=372.7

Thus, the temperature of the vapor in the flask in Kelvin is, 372.7 K

Now we have to determine the volume of the flask in liters.

Conversion used :

1 L = 1000 mL

or,

1 mL = 0.001 L

As, 1 mL = 0.001 L

So, 248.1 mL = 248.1 × 0.001 L = 0.2481 L

Thus, the volume of the flask in liters is, 0.2481 L

(c) Now we have to determine the mass of vapor that was present in the flask.

Mass of flask and condensed vapor = 56.101 g

Mass of empty flask and stopper = 55.844 g

Mass of vapor in flask = Mass of flask and condensed vapor - Mass of empty flask and stopper

Mass of vapor in flask = 56.101 g - 55.844 g

Mass of vapor in flask = 0.257 g

Thus, the mass of vapor present in the flask was, 0.257 g

(d) Now we have to determine the number of moles of vapor present.

Using ideal gas equation:

PV = nRT

where,

P = Pressure of vapor = 0.989 atm

V = Volume of vapor  = 0.2481 L

n = number of moles of vapor = ?

R = Gas constant = 0.0821 L.atm/mol.K

T = Temperature of vapor = 372.7 K

Putting values in above equation, we get:

(0.989atm)\times 0.2481L=n\times (0.0821L.atm/mol.K)\times 372.7K\\\\n=0.00802mole

Thus, the number of moles of vapor present are 0.00802 mole.

(e) Now we have to determine the mass of one mole of vapor.

\text{Mass of one mole of vapor}=\frac{\text{Mass of vapor}}{\text{Moles of vapor}}

\text{Mass of one mole of vapor}=\frac{0.257g}{0.00802mole}=32.0g/mole

Thus, the mass of one mole of vapor is 32.0 g/mole

You might be interested in
If an atom has 17 protons and 18 neutrons, what is the charge of the atom's nucleus?​
seraphim [82]

dont need time cause time waiting on nobody

6 0
3 years ago
Which are precautions to take when working with heat and fire? Check all that apply.
Oduvanchick [21]
Wear face mask and holy the conical flask or test tube away from your face and body and dont put it on directly on fire or it
3 0
3 years ago
How many liters of O2 are required to produce 3.99 miles of CO2?
Elena L [17]

Answer:

A fat choad

Explanation:

2+2=4

6 0
3 years ago
How is dumping our waste different from dilution and dispersion?
ch4aika [34]
Dumping waste is different from dilution and dispersion. Dumping waste is directly disposing your waste and not regulating its effect to the environment. Dilution is done usually before waste water disposal, meaning adding water to the waste to minimize its concentration. 
6 0
2 years ago
Which two elements on the periodic table are in the same period?
emmainna [20.7K]

Answer:

Platinum and Gold ig.

6 0
3 years ago
Other questions:
  • An amount of solid barium chloride, 20.8 g, is dissolved in 100 g water in a coffee-cup calorimeter by the reaction: BaCl2 (s) 
    14·1 answer
  • Which type of compound dissociates?
    13·1 answer
  • How to do it not sure I tried but not sure
    12·1 answer
  • While driving your rental car on your vacation in Europe, you find that you are getting 8.8 km/L of gasoline. What does this val
    14·1 answer
  • A warm front moves into a region. What kind of weather most likely results?
    7·2 answers
  • How many magnesiums, Oxygens and hydrogens does Mg(OH)2 have?
    5·1 answer
  • When can Eric Wu take pictures of the three Moon<br> features?
    13·2 answers
  • Need help answering these questions. Please show all work. Thank you so much.
    5·1 answer
  • Let's Evaluate Complete the table below by giving the solute and the solvent of the given types and examples of solution.
    9·1 answer
  • One of the following represents the greatest mass of chlorine..........
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!