Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
Enthalpy of a chemical reactionThe enthalpy of a chemical reaction is known as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
Heat released in this caseIn this case, the balanced reaction is:
2 Mg(s) + O₂ (g) → 2 MgO(s) + 1204 kJ
This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 1204 kJ of heat is released.
When 0.75 moles of Mg are burned, then you can apply the following rule of three: if 2 moles of Mg releases 1204 kJ of heat, 0.75 moles of Mg releases how much heat?
[tex]heat=\frac{0.75 moles of Mgx1204 kJ}{2 moles of Mg}[/tex]
heat= 451.5 kJ
Finally, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
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50 points Acids & Bases
please help me children
#1
HCl+NaOH—»H_2O+NaCl#2
KOH+HNO_3—»KNO_3+HCl#3
H_2CO_3+Mg(OH)_2—»MgCO_3+H_2O#4
Al(OH)_3+HCl—»AlCl_3+H_2O
36. (Higher) 2Mg + O2 → 2Mgo. Limiting reactant is Mg (4 mol). What is the amount of
product (in mol)? PLEASE HELP ME HOW TO WORK THESE OUT!!
Answer:
4 mol MgO
Explanation:
convert the limiting reactant to product by using dimensional analysis in order to see how many moles total can be created of the product
4 mol Mg x [tex]\frac{2 mol MgO}{2 mol Mg}[/tex] = 4 mol MgO
1. How many mL of copper (II) sulfate of a 2.5M stock solution is needed to make 250 mL of 0.2M solution?
Answer:
20ml
Explanation:
using the formula;C1V1=C2V2
2.5×V1=0.2×250
2.5V1= 50
V1=50/2.5
V1=20L
PLEASE HELP ASAP
Gay-Lussac was a scientist who discovered the relationship between pressure and temperature of gases. what kind of relationship did he discover?
A. direct
B. intentional
C. indirect
D. chemical
Answer:
I think its D.!!
Explanation:
what mass of oxygen is produced when 1.84 mol of h2o2 decompose
derive the electric field at an axial point.
please help
don't spam
Answer:
[tex]\huge\underline{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]
before looking at what the question says ,
let's have some general information related to the topic of the question !
__________________________
[tex]\implies \: [/tex] Electric field refers to the force generated by a nearby charge in the surroundings.
__________________________
[tex]\implies \: [/tex] Mathematically ,
Electric field = [tex]\frac{Kq}{r^{2}} \\[/tex]
where ,
K = coulomb's constant
q = magnitude of charge
r = distance between the opposite terminals
___________________________
[tex]\implies \: [/tex] Dipole moment , P = 2qd
where ,
q = magnitude of charges
d = distance between the charges
___________________________
[tex]\implies \: [/tex] positive charge tends to throw the field away from it while negative charge tends to pull the field towards it !
_____________________________________
seems like enough of information , so now let's look at the derivation !
refer the attachments in order to see the derivation !
Final answer -
[tex]\bold\pink{E = \frac{2kp}{(x {}^{2} - d {}^{2} ) {}^{2} } } \\ [/tex]
while , for a short dipole
[tex]\bold\pink{E = \frac{2pk}{x {}^{3} }} \\ [/tex]
hope helpful :D
PLEASE HELP
A scientist records measurements of very low pressure and high relative humidity at the top of a mountain. A weather map indicates that a warm front is approaching the mountain. Which conditions would the scientist most likely observe.
Question 4 options:
partly cloudy and calm
very sunny with strong wind
windy and cloudy, with rain likely
very cloudy with violent thunderstorms approaching
Which of these are functions of the female reproductive system but not the male reproductive system?Select three options.
nourishes a developing baby
produces reproductive cells
protects the developing offspring
serves as place where fertilization takes place
transports reproductive cells
Answer:
Hello! your answer is A,C, and D!
Explanation:
These are things only females would do/have, I hope I helped and good luck!
Have a wonderful day/night!
if all of the finches started on one island, how would speciation (creation of new species) occur on the different island
Answer:
They would be different.
Explanation:
As the finches evolved and moved away from their primary island, they would differentiate and change their species slightly. Maybe color of=r beak shape.
What is a base used in deodorants? sorbitol carrageenan magnesium hydroxide sodium lauryl sulfate
The base used in deodorants is magnesium hydroxide. This is further explained below. Option B is correct.
What is base?Generally, A base is a chemical that reacts with hydrogen ions to neutralize an acid, a base ranges from 7-14 in the pH range
In conclusion, In deodorants, magnesium hydroxide is utilized as a base. The function of the base is to neutralize the acid released in our mouth by bacteria, which causes tooth decay and other associated problems.
Read more about Compound
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Answer:
C. magnesium hydroxide
Explanation:
Edge
What volume of 12 molar hydrochloric acid would be needed to create 1 L of a 1 molar solution of hydrochloric acid?
Taking into account the definition of dilution, 83.3 mL of 0.0833 Lof 12 molar hydrochloric acid would be needed to create 1 L of a 1 molar solution of hydrochloric acid.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.
Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeInitial volumeIn this case, you know:
Ci= 12 MVi= ?Cf= 1 MVf= 1 LReplacing in the definition of dilution:
12 M× Vi= 1 M× 1 L
Solving:
(1 M× 1 L)÷ 12 M= Vi
0.0833 L= 83.3 mL= Vi (being 1 L= 1000 mL)
In summary, 83.3 mL of 0.0833 Lof 12 molar hydrochloric acid would be needed to create 1 L of a 1 molar solution of hydrochloric acid.
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#SPJ1
An ion has 56 protons, 54 electrons, and 81 neutrons. What is the
element's symbol?
Explanation:
The barium – 137 cation would have 56 protons, 54 electrons and 81 neutrons.
What volume of 0.59 M sodium phosphate must be used to make 0.91 L of 2.45 M sodium phosphate?
V1.M1=V2.M2
V1 x 0.59 = 0.91 x 2.45
V1=3.78 L
Methane versus carbon dioxide are very important greenhouse gases. However, methane can retain and release about ____ times more heat than carbon dioxide.
The blank space in the task statement should be filled with 25 as methane can retain 25 times more heat than carbon dioxide.
Heat Retention: Methane and Carbon dioxideMethane, carbon dioxide amongst other gases are important greenhouse gases which allows the Earth retain it's heat in order for it to be habitable.
Methane can retain and release about 25 times more heat than Carbon Dioxide although Methane emissions are lower compared to Carbon Dioxide.
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What elements does hydrogen form hydrogen bonds with?
Answer:
nitrogen, oxygen, and fluorine.
Explanation:
Hydrogen bonding occurs where hydrogen is bound to STRONGLY electronegative elements, viz. nitrogen, oxygen, and fluorine. Explanation: See this answer. You should also compare the boiling points of N H 3, OH 2, and H F, with the hydrides of the lower Group. i.e. P H 3,SH 2 etc.
Answer:
Hydrogen forms bonds with Nitrogen, Oxygen and Fluorine.
Explanation:
Hydrogen bonding occurs only in molecules where hydrogen is covalently bonded to one of the above three elements.
5 points IF U ANSWER THE QUESTION CORRECTLY
Why does everyone in the world hate u? No matter what u do or say ur never perfect enough for them why is that?
Answer:
No matter how well how much you accomplish, or how much good you put into the world, you will always have haters. An unfortunate aspect of life is that some people hate when others do well.It’s just a way of life.some people just are jealous but dont let people brake you down.
Explanation:
hope this helps
To convert liquid water into steam, you must break.
The enthalpy of combustion for octane (C8H18(l)), a key component of gasoline, is –5074 kJ/mol. The reaction equation is: C8H18(l) + 12.5O2(g) (arrow) 8CO2(g) + 9H2O(g).
What is the (triangle)H (subscript f) for this reaction?
16CO2(g) + 18H2O(g) (arrow) 2C8H18(l) + 25O2(g)
Answer:
10,148 kJ
Explanation:
Did it on Engenuity 2022 and got it right - just double 5074
Answer:
10,148
Explanation:
This symbol is often used to indicate that heat was applied to aid in the reaction
What's oxygen called in an ionic bond.
Answer: Oxide
Explanation:
Why does benzilic acid only precipitate in acidic solution.
Benzilic acid will only precipitate in acidic solution to remove excess acid and restore equilibrium.
What are is chemical equilibrium?Chemical equilibrium refers to a state in which the rate at which reactant molecules combine to form products is equal to the rate at which products dissociate to form reactants.
For a reaction in equilibrium, any change to distort the equilibrium will cause equilibrium to shift to counter that change.
The components of Benzilic acid exist in equilibrium and will only precipitate in acidic solution because more acid has been added and equilibrium will shift to removal of excess acids.
Therefore, benzilic acid only precipitate in acidic solution in order to remove excess acid and restore equilibrium.
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GUYS HELP PLEASE!
Do you think that the 24-hour wind pattern along the coastline of Hawaii would occur in other places? If so, where? Construct an argument to explain your reasoning.
Answer:
The answer is yes! The Wind Pattern also known as trade winds. It can occur in other places near 30 Degrees to the north and south. for example In the east side Europe, Turkey, and Africa can all have trade winds And in north Algeria, Libya, Egypt, and Israel can also have trade winds.
I hope this helps!! :D
According to the diagram below, what is the correct order of waves from least energy to most energy?
a) gamma rays, X rays, Visible light, microwaves
b) Microwaves, Visible light, X rays, Gamma rays
c) Visible light, X rays, Gamma rays, Microwaves
d) X rays, Gamma rays, Microwaves, Visible light
b) Microwaves, Visible light, X rays, Gamma rays
A compound is 52.0% zinc 9.6% carbon and 38.4% oxygen. Calculate the empirical formula of the compound.
Answer:
So a compound is 52% Zinc(Zn), 9.6% Carbon(C), and 38.4% Oxygen (O). Let’s first start off by assuming that we have 100 g of this compound. This means that we have 52 g of Zinc, 9.6 g of Carbon, and 38.4 g of Oxygen.Zinc = 65.38 g/molCarbon = 12 g/molOxygen = 16 g/molThis means we have:52 g of Zn(1 mol Zn/65.38 g of Zn) ≈0.8 mol of Zn.9.6 g of C(1 mol C/12 g of C) = 0.8 mol of C38.4 g of O(1 mol of O/16 g of O) = 2.4 mol of O.
Explanation:
What we want to do next is divide each element by the common factor of all of them, which is 0.8. In most cases, you divide each element by the element with the least amount of moles. After we divide each by 0.8, you’ll notice you have 1 Zn, 1 C, and 3 O. This gives you the empirical formula of ZnCO3, or Zinc Carbonate.
How many major layers of atmosphere does earth have
Part One:
Electromagnetic waves can carry more data at higher frequencies. Why would a scientist opt to transmit data at a lower frequency instead?
What are the limitations of sending information using electromagnetic waves?
What are the differences between analog and digital signals?
What are the advantages of using digital signals over analog signals?
Using reliable internet sources, identify three ways we use analog and digital signals in our everyday lives.
Part Two:
Describe how radio telescopes are used to explore space.
Using reliable internet resources, identify ways we use radio waves on Earth.
Why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (Hint: What did the article say about the advantages of digital signals?)
Electromagnetic waves such as radio waves are used in information transmission either as digital or analogy signals.
What are electromagnetic waves?Electromagnetic waves are waves which are produced from the interactionof the electric and magnetic fields.
Transmitting data at lower frequencies enables the waves to travel longer distances than at higher frequencies, therefore scientists usually transmit data at a lower frequencies.
The limitations of transmitting information using electromagnetic waves include a limited number of broadcast frequencies and interference of waves.
Analog signals differ from digital signals in that analog signals have continuous electrical signals while digital signals have non-continuous electrical signals.
Digital signals over analog signals is that it transmits more information per second than analog signals Analog and digital signals are employed in mobile devices, television, radio, computers and the internet
A radio telescope is used to receive radio waves from astronomical radio sources in space.
It has several parts such as a dish and antenna,a receiver,a detector and an analyzer. The dish collects and focuses radio signals on the antenna and the information is processed by the receiver, detector and analyzer.
Radios waves are used for the transmission of radio and television signals.
Radio telescopes convert radio waves which are analog signals to electrical signals wgich are digital siagnals because it can be easily stored and transmitted in digital form.
Therefore, electromagnetic waves such as radio waves are used in information transmission.
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what does it mean when a dynamic equilibruim has been reached
Answer:
Dynamic equilibrium only occurs in reversible reactions, and it’s when the rate of the forward reaction is equal to the rate of the reverse reaction.
Explanation:
Does this answer your question?
A chemist needs to find the concentration of a solution of barium hydroxide.
Barium hydroxide solution is an alkali.
The chemist could find the concentration of the barium hydroxide solution using two different methods.
Method 1
• An excess of sodium sulfate solution is added to 25 cm3 of the barium hydroxide solution. A precipitate of barium sulfate is formed.
• The precipitate of barium sulfate is filtered, dried and weighed.
• The concentration of the barium hydroxide solution is calculated from the mass of
barium sulfate produced.
Method 2
• 25 cm3 of the barium hydroxide solution is titrated with hydrochloric acid of known concentration.
• The concentration of the barium hydroxide solution is calculated from the result of the titration.
Compare the advantages and disadvantages of the two methods. -5
Method 1: gravimetry
advantages: Impurities in the sample can be identified
disadvantages: The process is long, because it goes through several stages
Method 2: titration
advantages: the process is fast, because the titrate and titrant react immediately
disadvantages: Sometimes the determination of the end point of the titration is carried out too fast or too slowly so that the calculations carried out are inaccurate
Which of the following best describes the difference between a mixture and a pure substance? A. A mixture has the same properties throughout; a pure substance has the different properties throughout. B. A mixture has different properties throughout; a pure substance has the same properties throughout. C. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. D. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.
Answer:
B. A mixture has different properties throughout; a pure substance has the same properties throughout
Explanation:
Which of the following best describes the difference between a mixture and a pure substance?
A. A mixture has the same properties throughout; a pure substance has the different properties throughout.
B. A mixture has different properties throughout; a pure substance has the same properties throughout.
C. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom. ✓
A mixture consists of two or more than two type of substance in a not so balanced ratio while a pure substance is made up of only one kind of substance in a fixed ratio.D. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom.
A potential energy diagram is shown
What is the total change in enthalpy of this reaction?
we know that,
AᵣH = (Sum of enthalpies of products)-(Sum of enthalpies of reactants)
AᵣH = 55kJ - 30 kJ
AᵣH = 25kJ
or
AᵣH =( Activation Energy-Reactant energy) +( Activation Energy-product energy)
AᵣH =(65kJ -30kJ) +(65kJ-55kJ)
Since there's a degrade , we'll consider the PE of product as -veAᵣH = 35kJ - 10kJ
AᵣH = 25kJ
Answer:
B. 25 kj
Explanation:
Products-reactants
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