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
luda_lava [24]
3 years ago
15

A total of 2.00 mol of a compound is allowed to react with water in a foam coffee cup and the reaction produces 126 g of solutio

n. The reaction caused the temperature of the solution to rise from 21.00 to 24.70 ∘C. What is the enthalpy of this reaction? Assume that no heat is lost to the surroundings or to the coffee cup itself and that the specific heat of the solution is the same as that of pure water. Enter your answer in kilojoules per mole of compound to three significant figures.
Chemistry
1 answer:
Karo-lina-s [1.5K]3 years ago
4 0

Answer:

  • <u>0.976 kJ/mol</u>

Explanation:

A foam coffe cup is considered a perfectly insulated system: heat energy is not exchanged with the surroundings.

Under that assumption, the heat released by the chemical reaction is equal to the heat absorbed by the system.

1. Heat absorbed by the system:

Use the equation Heat = Q = m × C × ΔT, with:

  • m = 126 g (the amount of solution produced)
  • C = specific heat of pure water = 4.186 J/gºC
  • ΔT = increase of temperature = 24.70 ºC - 21.00ºC = 3.70ºC

Q = 126g × 4.186J/gºC × 3.70ºC = 1,951.5J

<em><u></u></em>

<em><u>2. Enthalpy of the reaction</u></em>

The enthalpy must be reported in kJ/mol.

Then, convert juoles to kilojoules, dividing by 1,000; and divide by 2.00 moles, which is the amount of compound that reacted:

  • ΔHrxn = 1,951.5J × (1kJ / 1,000J) × (1 / 2mol) ≈ 0.9758 kJ/mol

Round to <em>3 significant figures</em>: 0.976 kJ/mol

You might be interested in
At 9 a.m. on May 21, a body is discovered near a path in a park. The body is 10 feet from a tree beside the path. The body is pa
katrin2010 [14]

I'm pretty sure its D, Time of discovery of the body. Let me know (:

4 0
3 years ago
Read 2 more answers
Atomic mass is typically expressed in
Andre45 [30]

Answer:

amu

Explanation:

Please mark as brainleist

8 0
2 years ago
Read 2 more answers
1. How do aquatic animals obtain oxygen?
Ilya [14]

Answer:

the second one filter for dissolved

Explanation:

3 0
3 years ago
Diagram of Krebs cycle. ​
Dmitry [639]

Answer:

The drawing is this . Cannot you draw yourself

6 0
2 years ago
How are minute and seconds are related to degrees
jekas [21]

These minutes are further divided into sixty parts called seconds. The words minute and second used in this context have no immediate connection to how those words are usually used as amounts of time. In a full circle there are 360 degrees. Each degree is split up into 60 parts, each part being 1/60 of a degree.

No then contact me about that

5 0
3 years ago
Read 2 more answers
Other questions:
  • Please Help, will give 30 points! The following data was collected when a reaction was performed experimentally in the laborator
    13·1 answer
  • When a substance burns, a chemical reaction is taking place.<br><br> True<br><br> False
    7·2 answers
  • A dilute solution of bromine in carbon tetrachloride behaves as an ideal-dilute solution. The vapour pressure of pure CCl4 is 33
    14·1 answer
  • An experiment has been set up to determine if different types of insulation wrap will affect the temperature of water in a conta
    10·1 answer
  • What volume of 6.58M HCI is needed to make 500. mL of 3.00M HCI?
    6·1 answer
  • A bird building a nest for its young is a reproductive strategy. Based on this example, what do you think the term “reproductive
    6·2 answers
  • If a balloon containing 1,200 L of gas at 25°C and 760 mmHg pressure ascends to an altitude where the pressure is 380 mmHg and t
    7·1 answer
  • Why is alchemy not considered a science
    11·1 answer
  • Please help I really need it ill give brainliest
    13·1 answer
  • Which statement is true about a reaction represented by a chemical equation that shows energy as a reactant?
    9·2 answers
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!