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
natima [27]
2 years ago
11

What is the best definition of the enthalpy change Hr

Chemistry
1 answer:
Gre4nikov [31]2 years ago
5 0

Answer:

<em>The flow of thermal energy in a system, at constant atmospheric pressure AND at thermodynamic standard temperature and pressure.</em>

You might be interested in
How many mono-; di- ; and trichloro derivatives are possible for cyclopentane?
Studentka2010 [4]
Mono - 1 Di- 2 Tri - 4
8 0
3 years ago
How many grams of NaOH are<br> needed to make 400. mL of<br> 1.50 M solution?
juin [17]

Answer:

24g of NaOH are required

Explanation:

Molarity, M, is an unit of concentration widely used in chemistry defined as the ratio between moles of solute (In this case, NaOH), and volume of solution in liters.

We can find the moles of NaOH and its mass with the volume and desired concentration as follows:

<em>Moles NaOH:</em>

400.0mL = 0.400L * (1.50mol / L) = 0.600 moles NaOH

<em>Mass NaOH -Molar mass: 40.0g/mol-:</em>

0.600 moles * (40.0g / mol) =

<h3>24g of NaOH are required</h3>
7 0
3 years ago
Does anyone know a website where it solves me these types of problems OR if someone can help me with them?
Brut [27]

Answer:

you can use the idea of molecular masses to calculate easily

7 0
4 years ago
The line of longitude used as the origin in a system of coordinates
3241004551 [841]
Yup, that is correct.
7 0
3 years ago
Determine the electron-group arrangement, molecular shape, and ideal bond angle(s) for each of the following:
antoniya [11.8K]

The electron group arrangement of PH₃ is tetrahedral. The molecular shape is a Trigonal pyramid, and the bond angle is 93°.

<h3>What is the bond angle?</h3>

The angle between the atoms in a compound is known as the bond angle. The degree of the binding angle is specified. There is also the bond length. It is the separation between the two atoms' nuclei.

The bond angle between the atoms of phosphine is 93°. It has one lone pair. The central atom is covered with 4 atoms.

Thus, the electron-group arrangement of phosphine is tetrahedral. The molecular geometry or shape is a trigonal pyramid. The bond angle is 93°.

To learn more about bond angles, refer to the link:

brainly.com/question/1851495

#SPJ4

8 0
2 years ago
Other questions:
  • A 1.000 mL sample of acetone, a common solvent sometimes used as a paint remover, was placed in a small bottle whose mass was kn
    6·1 answer
  • Two chemical samples were heated individually in a flame and both produced an identical orange flame. What conclusion can you dr
    15·1 answer
  • Chemists use activity series to determine wether which type of reaction will occur?
    7·1 answer
  • A mammoth skeleton has a carbon-14 decay rate of 0.49 disintegrations per minute per gram of carbon (0.49 dis/min⋅gC ). You may
    10·1 answer
  • PLEASEE HELPPP ME WITH NUMBER 5!!!!!!!
    9·1 answer
  • What two pieces of information do u need to describe force
    6·2 answers
  • A certain signal produces 2.56x10^9 waves per hour (2560000000 waves/h). What is the frequency of this signal in Hertz?
    6·1 answer
  • Which of these terms best describes the following statement?
    14·1 answer
  • What causes the phases of the moon? A) The amount of sunlight reflected onto the moon from the sun B) The Moon Earth and Sun are
    12·1 answer
  • Using subject academic vocabulary (ex. Pretend you are teaching a friend about the differences between plant and animals cells.
    8·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!