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
Vladimir79 [104]
3 years ago
5

The chemistry of nitrogen oxides is very versatile. Given the following reactions and their standard enthalpy changes, (1) NO(g)

+ NO2(g) → N2O3(g) ΔH o rxn = −39.8 kJ (2) NO(g) + NO2(g) + O2(g) → N2O5(g) ΔH o rxn = −112.5 kJ (3) 2NO2(g) → N2O4(g) ΔH o rxn = −57.2 kJ (4) 2NO(g) + O2(g) → 2NO2(g) ΔH o rxn = −114.2 kJ (5) N2O5(s) → N2O5(g) ΔH o subl = 54.1 kJ Calculate the heat of reaction for N2O3(g) + N2O5(s) → 2N2O4(g) ΔH = kJ
Chemistry
1 answer:
AVprozaik [17]3 years ago
8 0

Answer:

The heat of reaction for N₂O₃(g) + N₂O₅(s) → 2 N₂O₄(g) is ΔH = -22.2 kJ

Explanation:

Given the following reactions and their standard enthalpy changes:

(1) NO(g) + NO₂(g) → N₂O₃(g) ΔH o rxn = −39.8 kJ

(2) NO(g) + NO₂(g) + O₂(g) → N₂O₅(g) ΔH o rxn = −112.5 kJ

(3) 2 NO₂(g) → N₂O₄(g) ΔH o rxn = −57.2 kJ

(4) 2 NO(g) + O₂(g) → 2 NO₂(g) ΔH o rxn = −114.2 kJ

(5) N₂O₅(s) → N₂O₅(g) ΔH o subl = 54.1 kJ

You need to get the heat of reaction from: N₂O₃(g) + N₂O₅(s) → 2 N₂O₄(g)

Hess's Law states: "The variation of Enthalpy in a chemical reaction will be the same if it occurs in a single stage or in several stages." That is, the sum of the ∆H of each stage of the reaction will give us a value equal to the ∆H of the reaction when verified in a single stage.

This law is the one that will be used in this case. For that, through the intermediate steps, you must reach the final chemical reaction from which you want to obtain the heat of reaction.

Hess's law explains that enthalpy changes are additive. And it should be taken into account:

  • If the chemical equation is inverted, the symbol of ΔH is also reversed.
  • If the coefficients are multiplied, multiply ΔH by the same factor.
  • If the coefficients are divided, divide ΔH by the same divisor.

Taking into account the above, to obtain the chemical equation

N₂O₃(g) + N₂O₅(s) → 2 N₂O₄(g)  you must do the following:

  • Multiply equation (3) by 2

(3) 2*[2 NO₂(g) → N₂O₄(g) ] ΔH o rxn = −57.2 kJ*2

<em>4 NO₂(g) →  2 N₂O₄(g)  ΔH o rxn = −114.4 kJ</em>

  • Reverse equations (1) and (2)

(1) <em>N₂O₃(g)  → NO(g) + NO₂(g) ΔH o rxn = 39.8 kJ</em>

(2) <em>N₂O₅(g) →  NO(g) + NO₂(g) + O₂(g)  ΔH o rxn = 112.5 kJ</em>

Equations (4) and (5) are maintained as stated.

(4) <em>2 NO(g) + O₂(g) → 2 NO₂(g) ΔH o rxn = −114.2 kJ </em>

(5) <em>N₂O₅(s) → N₂O₅(g) ΔH o subl = 54.1 kJ </em>

The sum of the adjusted equations should give the problem equation, adjusting by canceling the compounds that appear in the reagents and the products according to the quantity of each of them.

Finally the enthalpies add algebraically:

ΔH= -114.4 kJ + 39.8 kJ + 112.5 kJ -114.2 kJ + 54.1 kJ

ΔH= -22.2 kJ

<u><em>The heat of reaction for N₂O₃(g) + N₂O₅(s) → 2 N₂O₄(g) is ΔH = -22.2 kJ</em></u>

You might be interested in
The diagram is an example of which of the following..
Evgesh-ka [11]

Thats an alkane.

Option  B.

6 0
1 year ago
Deforestation typically
MakcuM [25]
<span>Deforestation typically leads to soil erosion and the ruin of the ecosystem where deforestation occurred. The land gets destroyed and with it the natural habitat of the animals and plants who live there. In addition, we, the humans, lose oxygen because of lack of trees.</span>
4 0
3 years ago
During a chemical change items are lost or gained to make new substance true or false​
Otrada [13]

Answer:

If you meant Atoms then the answer is false

5 0
3 years ago
Explain how our body systems work together to get oxygen into and around our body.
aleksandrvk [35]

Answer:  (1) Inhales (breathes in) Oxygen - good for the body - gives it to the Circulatory System to be transported throughout the body through the blood. (1) Digestive System gets nutrients (good) from food and hands it over to the blood and Circulatory System then carries those nutrients where they need to go.

7 0
2 years ago
Which of the following has helped preserve resources while cutting the demand for energy?
sweet [91]
A is the correct answer
4 0
2 years ago
Read 2 more answers
Other questions:
  • What is the energy of a photon that has a frequency of 0.5 Hz?
    8·1 answer
  • Does anyone know where i can find a practice cumulative chem test online?
    13·1 answer
  • Classify each of the following pure substances as an element or a compound. a. helium gas (He) b. mercury (Hg) in a thermometer
    9·1 answer
  • What is a type of force that will change an objects motion
    12·1 answer
  • A 20.0 % by mass solution of phosphoric acid (H 3PO 4) in water has a density of 1.114 g/mL at 20°C. What is the molarity of thi
    8·1 answer
  • Which of the following is the best description of a career?
    5·1 answer
  • If a person weighs 68.2 kg, how many pounds is that? Show detailed work
    9·1 answer
  • 1. Which of the following facts did Dalton realize?
    7·1 answer
  • Please Answer ASAP!!
    12·1 answer
  • Can a substance be a Lewis acid without being a Bronsted-Lowry acid?<br> Please argue on it
    7·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!