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
Help me i could fail this
Alina [70]

Answer:

1231231234124

Explanation:

3213+123124124

5 0
3 years ago
Read 2 more answers
Answer the following questions. When you have finished, submit this assignment to your teacher by the due date for full credit.
Stells [14]

Answer:

1. chloroplast

2. they prevent some proteins to function how they normally function

Explanation:

3 0
2 years ago
Name the following covalent compound:
mote1985 [20]

Answer:

Pentasulfur nonanitride.

Explanation:

In order to name a compound properly, we need to identify the type of a compound we have. The given compound consists of two non-metals, sulfur and nitrogen. This implies that we have a covalent compound in contrast to an ionic compound which consists of a metal and a non-metal.

To name a molecular/covalent compound, we should use prefixes stating the number of atoms we have. In this case, we have 5 sulfur atoms. The prefix for 5 is 'penta'. That said, we have 'pentasulfur' as our beginning of the name.

We also have 9 nitrogen atoms. The second atom in the molecular formula would have an ending of '-ide', so we expect to have 'nitride'. Adding a prefix for 9, we'd have 'nonanitride'.

Putting everything together, the name is pentasulfur nonanitride.

Some common prefixes:

mono – one (we don't state mono for the first atom, e. g., we would name CO as carbon monoxide instead of monocarbon monoxide);

di – two;

tri – three;

tetra – four;

penta – five;

hexa – six;

hepta – seven;

octa – eight;

nona – nine;

deca – ten.

Notice that 'decanitride' would be correct in case you had 10 nitrogen atoms, similarly, tetra and hexa stand for 4 and 6 instead of 5 given sulfur atoms.

6 0
3 years ago
How do the melting and boiling points of water compare to that of other molecular compounds of similar molar mass?
sergey [27]

Answer:

The answer is D.

Explanation:

3 0
3 years ago
How many moles are there in 2.35 x 10^24 molecules of h2o
svetoff [14.1K]

Answer:

Explanation:

Mole = no. Molecules/6.02×10^23

Mole = (2.35×10^24)/(6.02×10^23)

Mole = 3.9mole

6 0
4 years ago
Other questions:
  • Select all that is true.
    15·2 answers
  • Give an example of how environmental science might involve geology and chemistry.
    13·1 answer
  • The charges of a set of isoelectronic ions vary from 3+ to 3-. Place the ions in order of increasing size.
    8·1 answer
  • An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the
    9·2 answers
  • What mass of sodium sulfate is needed to make 2.5 L of 2.0 M solution?
    13·1 answer
  • While both comets and asteroids are found to orbit the sun in our solar system which system which choice correctly explain how t
    9·1 answer
  • In which layer of the atmosphere can you find meteors?
    6·1 answer
  • Please help asappp‍♀️!
    10·2 answers
  • 3. The air today is approximately one-fifth
    5·1 answer
  • When a glow stick is crushed and shaken, the two liquids mix and the stick glows.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!