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
kkurt [141]
3 years ago
5

Type the correct answer in the box. Express the answer to two significant figures.

Chemistry
2 answers:
meriva3 years ago
8 0

Delta enthalpy = 2x386-3x1x432-3x942=-3350kJ/mol

Juli2301 [7.4K]3 years ago
5 0

Answer:

The enthalpy change for the reaction is -78 kJ

Explanation:

In the given reaction, 1 mol of N\equiv N and 3 moles of H-H bonds are broken. Also 6 moles of N-H bonds are formed as 1 mol of NH_{3} contains 3 moles of N-H bonds.

Now, energy is released during bond formation. So, for this case, sign of bond energy will be negative. Also energy if supplied during bond breaking. So, for this case, sign of bond energy will be positive.

Hence change in enthalpy of reaction= (1\times bond enrgy of N\equiv N)+(3\times bond energy of H-H)-(6\times bond energy of N-H)=(1\times 942)+(3\times 432)-(6\times 386)kJ= -78 kJ

You might be interested in
Balance the following reaction _ Al + _ Cl, → _ AICI,
Free_Kalibri [48]

Answer:

1 Al + 1 Cl -> 1 AlCl

Explanation:

It is already balanced.

3 0
3 years ago
What is the difference between Mixtures and Compounds? I am trying to study for my Science quiz on Tuesday, and I need to know t
Deffense [45]
A mixture can be separated.  Everything in a mixture keeps it's own properties and are not chemically joined together.  I am not completely sure about the compound.  Although with the cake example, the ingredients have been mixed and kind of "fused" together upon baking. Hope this helps a little. (P.S. trail mix is a good example of a mixture.)
8 0
2 years ago
How much heat must be absorbed by 125 g of ethanol to change its temperature from 21.5 ∘C to 34.8 ∘C? (Specific heat capacity of
Katarina [22]

Answer:

Option D. 4.02 kJ

Explanation:

A simple calorimetry problem

Q = m . C . ΔT

ΔT = Final T° - Initial T°

C = Specific heat capacity

m = mass

Let's replace the data

Q = 125 g . 2.42 J/g∘C . (34.8°C -21.5 °C)

Q= 4023.25 J

We must convert the answer to kJ

4023.25 J . 1kJ /1000 =4.02kJ

3 0
3 years ago
Is silicon a compound yes or no​
Crazy boy [7]

Answer: Yes

Explanation: Silicon is never found as a free element naturally, meaning it always occurs with other elements.

4 0
3 years ago
(Digestion, Intestine, Bile)is secreted by the liver to help in the breaking down of food particles.​
Yuri [45]

Answer:

Bile

Explanation:

Bile is secreted by the liver to help in the breaking down of food particles.​

5 0
1 year ago
Other questions:
  • It's Peggy Sue's birthday and she's about to blow out the candles on her cake. Brother Roger stops the party when he shouts: "Lo
    10·2 answers
  • What part of a microscope supports the weight of the microscope
    15·2 answers
  • Does a light with low frequency and long wavelength have a lot or little energy?
    7·1 answer
  • 6. Suppose you are going to measure the length of a pencil in centimeters.
    10·1 answer
  • Which two planets are called "ice giants"? ​
    6·2 answers
  • When helium was discovered by humans?
    13·1 answer
  • Will the pH of your stomach increase after sucking antacid tablets?
    10·1 answer
  • An electrically neutral atom of oxygen has eight electrons. What other facts do you know for sure about this atom? 1.) there are
    9·2 answers
  • This is the number of protons and neutrons i the nucleus of any atom
    12·1 answer
  • Which of earth's spheres consists of all living things?
    5·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!