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
Tom [10]
3 years ago
7

1. How much heat is necessary to vaporize 500 g of water at its boiling point?

Chemistry
1 answer:
GaryK [48]3 years ago
3 0

<span>1.    </span>When water converts to vapor phase from liquid phase, there is no any temperature change. In other words, when a substance changes its phase, the temperature remains constant.

So we can use the formula

Q = mL

Where Q is the heat (J), m is the mass (g) and L is the latent heat (J/g).

 

M = 500 g

L = Latent heat of vaporization = 2230 J/g

 

Hence, Q = 500 g x 2230 J/g = 1115000 J = 1115 kJ

Hence, 1115 kJ of heat is needed to vaporize 500 g of water at its boiling point.

 

<span>2.    </span>Let’s assume that water is at its freezing point (0 ⁰C). Then there is only phase conversion and no any temperature change. Again we can use the formula,

<span> Q = mL</span>

                      

Here, Q is the heat that given off (J), m is the mass (g) and L is the latent heat of fusion (J/g).

 

Q = 5100 J

L = 334 J/g

 

Hence, 5100 J = m x 334 J/g

<span>                    m = 5100 J / 334 J/g</span>

<span>                    m = 15.269 g</span>

Hence, the mass of water is 15.269 g.


3.  When condensing vapor into its liquid again it is only a phase conversion and temperature remains as constant (100 ⁰C).

Hence, we can use the formula,

<span> Q = mL</span>

 

Here, Q is the heat that given off (J), m is the mass of vapor (g) and L is the Latent heat of vaporization (J/g).

 

Q = 57.500 J

L = 2230 J/g

By applying the equation,

<span>          57.500 J = m x 2,230 J/g</span>

<span>                     m =0.0258 g</span>

<span>
</span>

<span>Hence, the mass of steam is 0.0258 g.</span>

 

You might be interested in
Determine the molar solubility for pb3(po4)2 in pure water. ksp for pb3(po4)2 is 1.0 x 10-54.
hoa [83]
Dissociation of Pb₃(PO₄)₂ is;
                       Pb₃(PO₄)₂(s)     ⇆      3Pb²⁺(aq)     +     2PO₄³⁻(aq)
initial                                                    -                          -
change               -X                            +3X                     +2X
Equilibrium                                          3X                        2X

Ksp            =       [Pb²⁺(aq)]³ [PO₄³⁻(aq)]²
1.0 x 10⁻⁵⁴ =         (3X)³ (2X)²
1.0 x 10⁻⁵⁴ =        108X⁵
         X      =        6.21 x 10⁻¹² M

Hence the molar solubility of Pb₃(PO₄)₂ is 6.21 x 10⁻¹² M.
7 0
3 years ago
You have a cup of hot water and you dissolve as much salt in it as possible. You then put the cup into the refrigerator and you
hoa [83]
Some of the salt would settle out. When the water was heated, it was able to absorb more salt than usual. This is known as super saturation. When the water is frozen it cannot hold as much salt, so some of it has to come out.
6 0
3 years ago
Read 2 more answers
When a rock is wrapped in aluminum foil, the radiation detected from the 29
zalisa [80]

Answer:

gamma

Explanation:

5 0
3 years ago
What is the net force of 4N 2N!!
RSB [31]

Answer: 4 N-2 N=2 Nto the left. Change in motion: The box will move to the left. 7.)

Explanation: Please mark branliest.

8 0
3 years ago
Which statement is true about the cells of non-living objects? A. They have prokaryotic cells. B. They have eukaryotic cells. C.
zloy xaker [14]
D, obviously. All living things are made of one or more cells, therefore non-living things aren’t made of cells
8 0
3 years ago
Other questions:
  • To make a table of the elements, dimitri Mendeleev sorted the elements according to their?
    8·2 answers
  • What is the independent variable in the graph?
    8·1 answer
  • The process by which a radioactive isotope loses protons or other materials from its nucleus is called
    8·1 answer
  • Ammonia is produced synthetically by the reaction: 2Fe+3Cl2 --- 2FeCl3
    5·1 answer
  • What electrically neutral atom will have an electron configuration of 1 s 22 s 22 p 4? Use a periodic table.
    14·1 answer
  • The metallurgical process in which a metal is obtained in a fused state is called
    8·2 answers
  • A student followed the procedure of this experiment to determine the solubility product of zinc(II) iodate, Zn(IO3)2. Solutions
    8·1 answer
  • The structural level of a protein least affected by a disruption in hydrogen bonding is the
    11·2 answers
  • he atomic number of fluorine is 9. How many electrons does an ion of fluorine have if it is represented by the symbol shown belo
    11·2 answers
  • What type of rock forms when heat or pressure change an existing rock?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!