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
Crank
3 years ago
13

At 1 atm pressure, the heat of sublimation of gallium is 277 kj/mol and the heat of vaporization is 271 kj/mol. to the correct n

umber of significant figures, how much heat is required to melt 4.50 mol of gallium at 1 atm pressure?
Physics
1 answer:
Andreyy893 years ago
7 0
Below are the choices that can be found elsewhere:

 a. 268 kJ 
<span>b. 271 kJ </span>
<span>c. 9 kJ </span>
<span>d. 6 kJ
</span>
So the key thing to realize here is what the information given to you actually means. Sublimation is going from a sold to a gas. Vaporization is going from a liquid to a gas. Hence you can create two equations from the information that you have: 

<span>Ga (s) --> Ga (g) delta H = 277 kJ/mol </span>

<span>Ga (l) --> Ga (g) delta H = 271 kJ/mol </span>

<span>From these two equations, you can then infer how to get the melting equation be simply finding the difference between the sublimation (two steps) and vaporization (one step). </span>

<span>Ga (s) --> Ga (l) delta H = 6 kJ/mol </span>

<span>At this point, all you need to do is a bit of stoichiometry. You start with 1.50 mol and multiply by the amount of energy per mole (6 kJ/mol). </span>

<span>*ANSWER* </span>
<span>9 kJ/mol (C)</span>
You might be interested in
200 pages about string thirory
joja [24]

Answer:

do not know the answer

Explanation:

7 0
3 years ago
Read 2 more answers
Which student is doing work?
Vilka [71]

Answer:

d

hope this helps

Explanation:

8 0
3 years ago
Read 2 more answers
Your oven has a power rating of 5000 watt...
romanna [79]
A). 1,000 watts = 1 kilowatt
5,000 watts = 5 kilowatts

b). (5 kilowatts) x (2 hours) = 10 kilowatt-hours (kWh)

c). (10 kWh) x (15 cents/kWh) = $1.50
4 0
3 years ago
Describe the importance of conservative forces to conservation of energy.
qwelly [4]
Not sure but just coming to say good luck and take your time
6 0
3 years ago
Who is responsible of refraction light 1/3 in eye
alexandr1967 [171]

The cornea is  responsible of refraction light 1/3 in eye.

<h3>What is the function of the cornea?</h3>

In addition to the protective function, it plays a fundamental role in the formation of vision. Transparent, it works like a lens over the iris, focusing light from the pupil towards the retina.

Normally, the cornea and lens deflect (refract) incoming light rays, focusing them on the retina. The shape of the cornea is fixed, but the lens changes shape to focus on objects at different distances from the eye.

See more about cornea at brainly.com/question/2297282

#SPJ12

3 0
2 years ago
Other questions:
  • When a steady current flows through a resistor, the resistor heats up. We say that "electrical energy is dissipated" by the resi
    12·1 answer
  • A student is given an assignment to demonstrate diffraction. He takes a photograph of a straw in a glass of water. The straw app
    15·2 answers
  • How are hypertension, heart disease, and stroke related?
    14·1 answer
  • A bicycle pedal is pushed straight downwards by a foot with a 16 Newton force. The shaft of the pedal is 20 cm long. If the shaf
    6·1 answer
  • With no difference in temperatures and 100% humidity, will it rain?
    9·1 answer
  • The Bugatti Veyron requires 2.40 s to accelerate from 0 to 60.0 mi/h. Calculate the distance that the car would travel in the ti
    11·1 answer
  • What is the measure of disorder in a system called? A. efficiency B. Enthalpy C. Work D. Entropy
    5·2 answers
  • Radioactive iodine (radioiodine) is given to patients with some forms of thyroid cancer in order to destroy the cancer cells. 13
    5·1 answer
  • PLEASE HELP!!! I have an electromagnet. If I detach the two wires from the battery and reattach them to the opposite terminals,
    6·1 answer
  • According to the "Law of Increasing Opportunity Costs," what would be the opportunity cost of a student who is staying up all ni
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!