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
Ksivusya [100]
3 years ago
12

Ammonia, NH3, is used as a refrigerant. At its boiling point of –33 oC, the standard enthalpy of vaporization of ammonia is 23.3

kJ/mol. How much heat is released when 50.0 g of ammonia is condensed at –33 oC?–0.466 kJ–7.94 kJ–36.6 kJ–68.4 kJ–1.17 x 103 kJ
Chemistry
1 answer:
mario62 [17]3 years ago
4 0

Answer:

-68.4 kJ

Explanation:

<u>The standard enthalpy of vaporization = 23.3 kJ/mol</u>

<u>which means the energy required to vaporize 1 mole of ammonia at its boiling point (-33 °C).</u>

To calculate heat released when 50.0 g of ammonia is condensed at -33 °C.

This is the opposite of enthalpy of vaporization which means that same magnitude of heat is released.

<u>Thus,  Q = -23.3 kJ/mol</u>

<u>Where negative sign signifies release of heat</u>

Given: mass of 50.0 g

Molar mass of ammonia = 17.034 g/mol

Moles of ammonia = 50.0 /17.034 moles = 2.9353 moles

Also,

1 mole of ammonia when condenses at -33 °C releases 23.3 kJ

2.9412 moles of ammonia when condenses at -33 °C releases 23.3×2.9353 kJ

<u>Thus, amount of heat released when 50 g of ammonia condensed at -33 °C= -68.4 kJ, where negative sign signifies release of heat.</u>

You might be interested in
In the hospital, 35 babies were born. If 22 were boys, what percentage was boys. Express your answer in places
Hunter-Best [27]
62.857% of the babies were boys
3 0
3 years ago
How many atoms are in a sample of 0.75 moles of carbon atoms
vova2212 [387]

Answer: 4.5165 *10^-23 moles Carbon

Explanation:

There are 6.022*10^23 atoms in a mole.

Therefore, there would be 6.022*10^-23*0.75 atoms in 0.75 moles of Carbon.

= 4.5165 *10^-23 moles Carbon

8 0
3 years ago
Read 2 more answers
Un vehículo inicia su recorrido desde el reposo, al cabo de 30 segundos tiene una velocidad de 120 m/s. ¿Cuál es la aceleración
BARSIC [14]

Explanation:

KTLDÖDUÖOQO5SKDXBBCMCNXYLZD

8 0
3 years ago
A mole equals 6.02 x 10^23 . Answer these questions below.
siniylev [52]

Answer:

1. 1.25 mol ants x 6.02*10^23 ants/1 mol ants = 7.53*10^23 ants

2. 4.92*10^26 pencils x 1 mol pencils/6.02*10^23 pencils = 817 mol pencils

3. 0.26 mol molecules x 6.02*10^23 molecules/1 mol molecules = 1.6*10^23 molecules

4. 3.46*10^19 molecules x 1 mol molecules/6.02*10^23 molecules = 5.75*10^-5 mol molecules

5. 5.3*10^20 atoms x 1 mol atoms/6.02*10^23 atoms = 8.8 mol atoms

6. 0.11 mol atoms x 6.02*10^23 atoms/1 mol atoms = 6.6*10^22 atoms

I would suggest looking into "dimensional analysis" for help with this type of material. Dimensional analysis will stick with you all throughout chemistry, so picking it up will be extremely beneficial.

7 0
3 years ago
What type of spectrum is produced when electromagnetic radiation is emitted or absorbed as electrons change energy levels in an
mina [271]

When electrons in atom interaction with light or photons one of the two process takes place:

1) they can absorb photons of a characteristic wavelength (which depends on the energy difference between two interacting atomic levels) and get excited to a higher energy level

2) or they can jump to a lower energy level and emit photons of the corresponding wavelength.

The type of spectrum produced when electrons in an atom undergo transitions to various levels by absorbing or emitting photons is termed as atomic spectrum.

5 0
3 years ago
Read 2 more answers
Other questions:
  • Twenty-seven milliliters of an acid with an unknown concentration are titrated with a base that has a concentration of 0.55 M. T
    10·2 answers
  • What is a claim?
    12·2 answers
  • A mass of 100.0 g of NaCl is added to 100.0 mL of water, but not all of it dissolves. A mass of 59.5 grams of NaCl solid remains
    11·2 answers
  • What did Ernest Rutherford s gold foil experiment demonstrate about atoms?
    14·1 answer
  • 1. If 100 mL of a gas, originally at 760 torr, is compressed to a pressure of 120 kPa
    9·1 answer
  • In a college there are exactly 3000 students, exactly 60% are male. What is the number of female students
    15·1 answer
  • Lactic acid results from which of the following?
    9·2 answers
  • The Statue of Liberty changing from Copper to Green is an example of...
    10·1 answer
  • Which of these statements accurately describes monomers?
    9·2 answers
  • Do bases react with metals the same way that acids do?.
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!