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
disa [49]
3 years ago
9

How many kilojoules are released when 8.2 g of water condenses at 100 °c and cools to 15 °c?

Chemistry
1 answer:
MrRa [10]3 years ago
3 0

Answer:- 2.92 kJ of heat is released.

Solution:- We have water at 100 degree C and it's going to be cool to 15 degree C.

So, change in temperature, \Delta T = 15 - 100 = -85 degree C

mass of water, m = 8.2 g

specific heat of water, c = 4.184\frac{J}{^0C.g}

The equation used for solving this type of problems is:

q=mc\Delta T

Let's plug in the values in the equation and solve it for q which is the heat energy:

q = (8.2)(4.184)(-85)

q = -2916.248 J

They want answer in kJ. So, let's convert J to kJ and for this we divide by 1000.

q=-2916.248J(\frac{1kJ}{1000J})

q = -2.92 kJ

Negative sign indicates the heat is released. So, in the above process of coiling of water, 2.92 kJ of heat is released.

You might be interested in
Which of the following giant covalent structures does not have a high melting and boiling
iogann1982 [59]

Answer:

Polythene has the lowest melting/boiling point from all the other covalent structures mentioned in this question.

6 0
3 years ago
Read 2 more answers
Will name brainliest
aliina [53]
<h3>Answer:</h3>

c=54

Explanation:

6•c/6= 6•9

c=6•9

c=54

6 0
3 years ago
Read 2 more answers
Identify whether each reaction represents a chemical reaction or a nuclear reaction by filling in the blank with the word ‘chemi
valkas [14]
A chemical reaction is defined as the reaction between two or more substances that produces new substances/compounds.

On the other hand, a nuclear reaction is a reaction that alters the nucleus of a certain atom. This can be done either by splitting the nucleus or by joining this nucleus with another one.

Reaction 1:
Cl₂ + H₂ ............> 2 HCl
This is the combination of two elements to produce a new compound.
Therefore, this reaction is a chemical reaction

Reaction 2:
²₁H + ³₁H .........> ⁴₂H + ¹₀n
This is an alteration in the nucleus of a hydrogen atom by bonding it with another nucleus.
Therefore, this reaction is a nuclear reaction

Hope this helps :)

5 0
3 years ago
Read 2 more answers
The reaction below demonstrates which characteristic of a base?
svlad2 [7]

Answer: option D. the ability of a base to react with a soluble metal salt.


Justification:


NaOH is a strong base, which means that in water it will dissociate according to this reaction:


  • NaOH(aq) → Na⁺ (aq) + OH⁻ (aq)

On the other hand, CuSO₄ is a soluble ionic salt which in water will dissociate into its ions according to this other reaction:

  • CuSO₄(aq) → Cu²⁺ + SO₄²⁻

Hence, in solution, the sodium ion (Na⁺) will  react with the metal salt in a double replacement reaction, where the highly reactive sodium ion (Na⁺) will substitute the Cu²⁺ in the CuSO₄ to form the sodium sulfate salt, Na₂SO₄ (water soluble), and the copper(II) hydroxide, Cu(OH)₂ (insoluble).


That is what the given reaction represents:


  CuSO₄ (aq)     +     2NaOH(aq)    →    Cu(OH)₂(s)       +     Na₂SO₄(aq)

         ↑                                ↑                         ↑                            ↑

soluble metal salt       strong base       insoluble base       solube salt



5 0
3 years ago
Read 2 more answers
Calculate the mass percent composition of carbon in C4F8
Anon25 [30]
My work to your question

4 0
3 years ago
Other questions:
  • Which statement describes a change that occurs during a chemical reaction? A. Atoms in the original substances are arranged in a
    14·2 answers
  • Explain the process on how the conditions for lightning to strike occurs?
    15·1 answer
  • If you were told an atom was an ion, you would know the atom must have a neutral charge. charge. negative charge. positive charg
    15·2 answers
  • How can describe electromagnetic waves with mechanical waves?
    11·1 answer
  • A soild reactant is placed in to a beaker of warm water. The liquid vigorously bubbles as the solid dissolves into the solution.
    7·1 answer
  • Why is the scientific process a flexible process? Please help I need to know this for finals.
    12·1 answer
  • A gas is collected at 30 Celsius and has a pressure of 200 kPa. What pressure would it exert if the temperature changed to 40 Ce
    14·1 answer
  • Which of the following Noble Gases has only 2 valence electrons because it only has 1 energy level?
    15·1 answer
  • Which statement best describes a mechanical wave?
    13·1 answer
  • How many molecules are in 4.50 mol of Na2Co3?​
    6·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!