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
Dafna1 [17]
3 years ago
10

For the formation of ammonia, NH3, the enthalpy of reaction is shown:

Chemistry
1 answer:
Nataly [62]3 years ago
4 0

<u>Answer:</u> The amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

<u>Explanation:</u>

Endothermic reactions are defined as the reactions in which energy is absorbed in the reaction. The enthalpy change of the reaction is positive.

Exothermic reactions are defined as the reactions in which energy is released in the reaction. The enthalpy change of the reaction is negative.

For the given chemical equation:

3H_2(g)+N_2(g)\rightarrow 2NH_3(g);\Delta H=-45.9kJ

In the above reaction, the enthalpy change is negative. So, the reaction is exothermic in nature.

For the reverse reaction, the magnitude of the enthalpy change remains the same but sign for it changes.

Hence, the amount of energy required to convert ammonia back to hydrogen and nitrogen is 45.9 kJ

You might be interested in
All elements are pure substances.<br><br> True<br><br> False
oee [108]
It can be a compound or a single element. An element is a pure substance that cannot be separated into simpler substances by chemical or physical means. There are about 117 elements, but carbon, hydrogen, nitrogen and oxygen are only a few that make up the largest portion of Earth.
hopefully that helps
5 0
3 years ago
Mammals and plants do not belong in the same domain. <br><br> Fact: <br><br> Evidence:
Zepler [3.9K]

False

Fact: Mammals and plants belong to the same domain, the Eukarya domain.

Evidence :All the organisms that possess a eukaryotic cell, plants, animals, protists, and fungi are in the Eukarya domain.

3 0
3 years ago
In the "Design a Thermos" lab, the temperature of the thermos was compared with a container that was not insulated.
Hitman42 [59]

Answer:

B

Explanation:

so you can see the difference

8 0
3 years ago
Read 2 more answers
Severus Snape explains that if you have the molar mass of a compound and the empirical formula of a compound you can determine t
KengaRu [80]

Answer:

The molecular formula of the compound :C_4H_6O_2

Explanation:

The empirical formula of the compound =C_2H_3O

The molecular formula of the compound =C_{2n}H_{3n}O_n

The equation used to calculate the valency is :

n=\frac{\text{molecular mass}}{\text{empirical mass}}

We are given:

Mass of molecular formula = 86 g/mol

Mass of empirical formula = 43 g/mol

Putting values in above equation, we get:

n=\frac{86g/mol}{43g/mol}=2

The molecular formula of the compound :

C_{2\times 2}H_{3\times 2}O_2=C_4H_6O_2

7 0
2 years ago
Determine the mass of CuSO4 • 5H20 that must be used to prepare 250mL of 2.01 M CuSO4(aq).
mario62 [17]

Given parameters:

Volume of CuSO₄ = 250mL

Concentration of CuSO₄ = 2.01M

Unknown:

Mass of CuSO₄.5H₂O = ?

To solve this problem, we must write the chemical relationship between both species.;

             CuSO₄.5H₂O  →   CuSO₄ + 5H₂O

Now that we know the expression, it is possible to solve for the unknown mass.

First find the number of moles of CuSO₄;

         Number of moles  = Concentration x Volume

Take 250mL to L so as to ensure uniformity of units;

           Volume  = 250 x 10⁻³L

  Input the parameters and solve for number of moles;

        Number of moles  = 250 x 10⁻³  x  2.01 = 0.5mol

From the equation;

             1 mole of CuSO₄ is produced from 1 mole of CuSO₄.5H₂O  

So  0.5 moles of CuSO₄ will be produced from 0.5 moles of CuSO₄.5H₂O

Now let us find the molar mass of CuSO₄.5H₂O = 63.6 + 32 + 4(16) + 5(2x1 + 16)  = 249.6g/mole

Mass of CuSO₄.5H₂O = number of moles x molar mass

                                      = 0.5 x 249.6

                                     = 124.8g

The mass of CuSO₄.5H₂O is 124.8g

5 0
3 years ago
Other questions:
  • Consider a triprotic acid like phosphoric acid or citric acid. which expression correctly describes the relative magnitudes of t
    11·1 answer
  • Thomson's experiments were significant in that they questioned
    13·2 answers
  • A bug walking on the surface of a puddle is depending on what property of water? High surface tension because of the attraction
    6·2 answers
  • A substance that produces a hydronium ion when dissolved in water is called a/an A. base. B. indicator. C. reactant. D. acid.
    5·2 answers
  • Why is it possible to use physical properties to separate a mixture
    7·1 answer
  • Which has the larger change hydration in each pair of a)Na+ Or cs+ b)Sr+2 or Rb+ c)Na+ or Cl- d) O-2 or F- e)OH- or SH-
    13·1 answer
  • In general, what happens to the rate of reaction when you decrease the
    9·1 answer
  • The work done on a machine, the product of the input force and the distance through which the force is exerted.
    11·1 answer
  • Which of these plants make the enviroment pleasant<br><br> a.sandalwood b.basil c.brahmi
    14·1 answer
  • Which word best describes a mixture that is 85 percent copper and 15 percent tin?
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!