Answer:
ΔH = -162.5 kJ.
Explanation:
Hello.
In this case, we first rearrange the reactions:
ClO(g) + O₃(g) ⇒ Cl(g) + 2O₂(g); ΔH =-122.8 kJ
2O₃(g) ⇒ 3O₂(g); ΔH=-285.3 kJ
O₃(g) + Cl(g) ⇒ ClO(g) + O₂(g); ΔH= ?
Thus, we are going to use the Hess law, as an strategy to rearrange the known chemical reactions and thereby compute the enthalpy of reaction of the unknown one.
1. The first reaction must be inverted in order to obtain chlorine as a reactant in the third one, therefore, the enthalpy of reaction becomes positive:
Cl(g) + 2O₂(g) ⇒ ClO(g) + O₃(g); ΔH = 122.8 kJ
2. Second reaction remains the same:
2O₃(g) ⇒ 3O₂(g); ΔH=-285.3 kJ
Then, we add them to obtain:
Cl(g) + 2O₂(g) + 2O₃(g) ⇒ ClO(g) + O₃(g) + 3O₂(g)
Whereas we can subtract both oxygen and ozone to obtain the third one:
O₃(g) + Cl(g) ⇒ ClO(g) + O₂(g)
Therefore, the enthalpy of reaction turns out:
ΔH = 122.8 kJ + (-285.3 kJ )
ΔH = -162.5 kJ.
Best regards.
. In an experiment, 1.90 g of NH3 reacts with 4.96 g of O2. 4NH3(g) + 5O2(g) ⟶ 4NO(g) + 6H2O(g) (i) Which is a limiting reactant? Show your working. (ii) How many grams of excess reactant remain? Show your working. (iii) How many grams of NO is formed? Show your working
1. The limiting reactant in the reaction is NH₃
2. The mass of the excess reactant remaining is 0.49 g
3. The mass of NO produced from the reaction is 3.35 g
Balanced equation4NH₃ + 5O₂ —> 4NO + 6H₂O
Molar mass of NH₃ = 14 + (3×1) = 17 g/mol
Mass of NH₃ from the balanced equation = 4 × 17 = 68 g
Molar mass of O₂ = 16 × 2 = 32 g/mol
Mass of O₂ from the balanced = 5 × 32 = 160 g
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 4 × 30 = 120 g
SUMMARY
From the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂ to produce 120 g of NO
1. How to determine the limiting reactantFrom the balanced equation above,
68 g of NH₃ reacted with 160 g of O₂
Therefore,
1.90 g of NH₃ will react with = (1.90 × 160) / 68 = 4.47 g of O₂
From the calculation made above, we can see that only 4.47 g out of 4.96 g of O₂ given is needed to react completely with 1.90 g of NH₃.
Therefore, NH₃ is the limiting reactant.
2. How to determine the mass of the excess reactant remaining Mass of excess reactant (O₂) given = 4.96 gMass of excess reactant (O₂) that reacted = 4.47 gMass of excess reactant (O₂) remaining =?Mass of excess reactant (O₂) remaining = 4.96 – 4.47
Mass of excess reactant (O₂) remaining = 0.49 g
3. How to determine the mass of NO producedIn this case, the limiting reactant (NH₃) will be used.
From the balanced equation above,
68 g of NH₃ reacted to produce 120 g of NO
Therefore,
1.90 g of NH₃ will react to produce = (1.90 × 120) / 68 = 3.35 g of NO.
Thus, 3.35 g of NO were obtained from the reaction.
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what is the force needed to accelerate a sled with a mass of 2 kg at a rate of 3.0/s²
A. 6.0N
B. 3.0N
C. 1.5N
D. 3.0N
(help asap please I will give brainliest to the correct answer )
Answer:
The answer is option AExplanation:
The force acting on an object given it's mass and acceleration can be found by using the formula
Force = mass × accelerationFrom the question
mass = 2 kg
acceleration = 3 m/s²
We have
Force = 2 × 3
We have the final answer as
6.0 NHope this helps you
Which action will decrease the gravitational force between two objects?
A. Adding mass to one of the objects
B. Increasing the charge on one of the objects
C. Reducing the masses of the objects
D. Moving the objects closer together
Answer: C
Explanation:
The force of gravity is proportional to the amount of mass in the system, and is inversely proportional to the separation distance between the two masses.
Adding mass to one of the objects would increase the gravitational field it produces, which in return increases the force of gravity.
Increasing the charge of one of the objects would technically add mass to the system, but it can be considered negligible. The adding of charge would cause an attraction between the two objects, but that is not the gravitational force. It is the Coulomb force.
Reducing the mass of one of the objects would decrease the gravitational field it produces, which would cause the force of gravity to decrease. This is the answer.
Moving the objects closer would cause the denominator of the force equation to decrease. A smaller denominator would cause the equality to increase, aka the gravitational force.
[tex]F=GMm/r^2[/tex]
How does latitude
affect climate?
Answer:
as the latitude increases, the intensity of the solar energy that strikes an area decreases,and climates become cooler
Explanation:
The higher the elevation the cooler the air therefore the climate becomes colder.
Gold can undergo transmutation. Which equation could correctly describe this radioactive decay?
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper Re + Superscript 4 Subscript 2 Baseline Upper H e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 4 Subscript 2 Baseline Upper H e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript negative 1 Baseline e
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e
um B is the answer on the unit test
Answer:
Superscript 185 Subscript 79 Baseline Upper A u right arrow Superscript 181 Subscript 77 Baseline Upper I r + Superscript 0 Subscript positive 1 Baseline e
Answer: the answer is B
Explanation:
just took the assignment
When fluids are subjected to increases in pressure they tend to do this.
A.) evaporate
B.) contract
C.) expand
D.) solidify
Answer:
D.) solidify
Explanation:
What is neutron?
What is Atom?
Answer:
A neutron is a subatomic particle with no charge and is found in the nucleus of an atom.
An atom is the smallest particle of an element that retains its identity in a chemical reaction.
Explanation:
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Answer:
See below.
Explanation:
Neutron is a subatomic particle which has a neutral charge and forms the nucleus of the atom.
Atom is the smallest unit of matter which composes solids, liquids, gases, and plasma.
what are the mitigating measures for flood,earthquake and fire?
Answer:Securing heavy objects to walls and floors, such as shelves, bookcases, cabinets, and water heaters.
Explanation:
8. A fossil plant that helps support the theory of continental drift is ____.
a. Mesosaurus
b. Glossopteris
c. Glomar
d. Pangaea
Answer:
b.
Explanation:
Why critical thinking is important for chemists?
Answer:
"Critical thinking is the analysis of available facts, evidence, observations, and arguments to form a judgment. The subject is complex; several different definitions exist, which generally include the rational, skeptical, and unbiased analysis or evaluation of factual evidence. Critical thinking is self-directed, self-disciplined, self-monitored, and self-corrective thinking. It presupposes assent to rigorous standards of excellence and mindful command of their use. It entails effective communication and problem-solving abilities as well as a commitment to overcome native egocentrism and sociocentrism." - Searched it up on Wiki, so at least I stated this-.
I hope this helps..?
Answer:
Critical thinking in the area of chemistry requires students to not just think about the concepts and principles of but also how they can be applied to other areas. Critical thinking creates an area of overlapping or related information to the nature of a certain function.
Explanation:
its simple plus hope this helps
the ion with a 3+ charge, 28 electrons, and a mass number of 71
Calcium and water are the reactants in this chemical reaction. The products are calcium hydroxide and hydrogen gas. Which statement correctly describes the total mass of the products when the reaction is complete?
Explanation:
Using the Law of Conservation of mass,the mass of the reactants should be equal to the mass of the products after the reaction.
Which of these characteristics differentiate electrons from protons and neutrons
How many atoms are in 3.5 L of Neon at STP? Show your work
Answer:
0.1734
this is the answer to the question
Calculate the wavelengths (in Å) for the first six Balmer lines (Ha, Hb, Hg, Hd, He, and Hz)
Explanation:
Transition of n 3→2 6→2
Name -H-α / Ba-α- H-δ- / Ba-δ
Wavelength (nm, air) -656.279 -410.1734
Energy difference (eV)- 1.89 -3.03
Color- Red -Violet
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H2O + C16H17NaO14 = CO2 + 8H20 + C2H3NaO3 Since there are 19 Hydrogen on the Reactants side, due to Law of Conservation of Mass, there must be ___Hydrogen on the Product side.
A. 0
B. 2
C. 8
D. 19
Answer: 8
Explanation:
Is there a relationship between low-income neighborhoods and obesity? What do you think are some of the reasons?
Answer:
cheaper foods are usually more processed and unhealthy, therefore, poorer people are likelier to be obese.
Explanation:
What information does an acid or base equilibrium constant give?
The value of the equilibrium constant shows the relative amounts or concentrations of the reactants and products.
What would happen if organ system failed to work together
Answer:
if organ systems failed to work together then the body will not function properly and we should not able to do a simple work and suffer from many others diseases.
1.is the light from the christmas tree natural or artificial?
You eat a large meal and then hike up a hill. What kind of energy transformation is your body performing?
Group of answer choices
Chemical energy to kinetic energy and gravitational potential energy
Chemical energy to kinetic energy and nuclear energy
Kinetic energy to chemical energy and light energy
Gravitational potential energy to sound energy and nuclear energy
Answer:
Chemical energy to kinetic energy and gravitational potential energy
Explanation:
The kinetic and potential energy is collectively known as the mechanical energy. When you eat a large meal and then hike up a hill the energy change taking place is Chemical energy to kinetic energy and gravitational potential energy. The correct option is A.
What is energy?The physical quantity which is transferred from one object to another to perform work or to heat the object is defined as the energy. The SI unit of energy is Joule and it is a derived unit.
The energy possessed by a moving body due to its motion is defined as the kinetic energy. The energy stored by an object due to its position is called the potential energy.
When we eat food, our body uses the chemical energy of food and during climbing, the body gets moved so the kinetic energy gets converted into gravitational potential energy.
Thus the correct option is A.
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Which of the following is true of a compound but not a mixture? (1) A compound contains more than one element.
(2) All the nuclei in a compound contain the same number of protons.
(3) A compound may be heterogeneous.
(4) The composition of a compound does not vary
The composition of a compound does not vary because it is made up of fix ratio by mass.
What is compound?A compound is a chemical substance that is composed of more than one element that held together by chemical bonds and produces fix ratio by mass so we can conclude that the composition of a compound does not vary because it is made up of fix ratio by mass.
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A photon has a wavelength of 220 nm. How much energy does the
photon have?
Answer:
The energy of a photon with a wavelength of 350 nm is 5.7×10−19 J .12/05/2
Explanation:
What type of energy is transferred during heating?
A. Thermal
B. Temperate
C. Convective
D. Conductive
Thank u for helping !:)
Answer:
A.) Thermal
Explanation:
I got it correct on founders edtell
Describe the structure of an Atom (HELP!)
Answer:
The answer is A.
Explanation:
Neutrons and protons are located in the dense middle of the atom called the nucleus, and electrons are located on the electron cloud located outside of the nucleus.
What is the missing force?
Answer:
The missing force is the 17 newton
Explanation:
The synthesis of carbohydrates can be particularly difficult because of the large number of chiral centers and OH functional groups present.
a. True
b. False
Stoichiometry: mole/ mole help
Answer:
0.531 moles of CO₂ are formed.
Explanation:
Given data:
Number of moles of CO = 0.531 mol
Number of moles of CO₂ formed = ?
Amount of oxygen = excess
Solution:
Chemical equation:
2CO + O₂ → 2CO₂
Now we will compare the moles of CO with CO₂.
CO : CO₂
2 : 2
0.531 : 0.531
Thus, 0.531 moles of CO₂ are formed.
In the diagram below, west is to the left, east is to the right, and the observer is looking toward the north. What is the direction of the wind?
A. NE
B. NW
C. SE
D. SW
Think of a substance that does not dissolve in water. Explain what happens when this substance is added to water.
An example would be oil. Oil is considered to be hydrophobic (which translates to "fear of water" so it is repelled by water). It floats on the top of water, which is why oil spills result in black blobs that float on the surface of the ocean rather than mix underneath the surface.