Combination (also called synthesis): Where two elements or one compound and one element will bond and form a new compound as a product, the representation for this reaction is:
A + B -> AB
Decomposition: The opposite from Combination, now one compound will decompose and form 2 new elements or compounds as the product:
AB -> A + B
Single Replacement: One element will take the place of another element in already existing compound:
A + BC -> AB + C
Double Replacement: Now we have two compounds switching elements and forming two new compounds:
AB + CD -> AC + BD
Combustion: Reactions that involve oxygen as reactant and we have CO2 and H2O as products:
X + O2 -> CO2 + H2O
According to the explanation, what we have in this reaction is a Single Displacement reaction, letter A
Sodium hydroxide is extremely soluble in water. At a certain temperature, a saturated solution contains 573 g NaOH(s) per liter of solution. Calculate the molarity of this saturated NaOH(aq) solution.Concentration: ____________ M
Remember: solution = NaOH + water
Volumen here = 1 L
Molecular mass NaOH = 39.99 g/mol
[tex]M\text{ = }\frac{573\text{ g}}{39.99\text{ }\frac{g}{\text{mol}}x\text{ 1 L}}=\text{ 14.32 }\frac{mol}{L}[/tex]Answer: Contration = 14.32 M
Two atoms with atomic numbers 12 and 17 would
bond to form an ionic compound
bond to form a covalent compound
bond to form a metallic lattice
not bond with each other
Answer:
bond to form a covalent bond
Explanation:
a covalent bond is formed when two atoms share electron pairs.
Follow these steps to write the balanced chemical equation for the reaction between nitric acid and iron (III)hydroxide.1. Start by writing the proper names of the products below (separated by a + sign).Nitric acid +Iron (III) hydroxide I2. Next, write the full, balanced molecular equation with the correct chemical formulas, includingcoefficients.3. Finally, write the net ionic equation for this reaction below, including ionic charges.
Calculate the total energy of 9.4 * 10^16 photons of visible light with a wavelength of 4.3 * 10^7 m.
According to the Planck's equation which is E= hc/λ the total energy of 9.4×10¹⁶ photons is 43.446×10[tex]^-17[/tex] J.
What is Planck's equation?Max Planck discovered the theory which stated that energy is transferred in the form of discrete packs which are called quanta and thus proposed an equation called the Planck's equation which relates energy and frequency of a photon and is given as, E=hcυ or in terms of wavelength it is ,E=hc/λ.
The equation makes use of a constant which is called the Planck's constant and it's value is 6.626×10[tex]^-34[/tex] Js.
Substituting the given value of wavelength of one photon in the above formula containing wavelength,E=6.626×10[tex]^-34[/tex]×3×10⁸/4.3×10⁷=4.622×10[tex]^-33[/tex] J.
Now, for energy of 9.4×10¹⁶ photons =4.622×10[tex]^-33[/tex]×9.4×10¹⁶=43.446×10[tex]^-17[/tex] J.
Thus, the energy of 9.4×10¹⁶ photons is 43.446×10[tex]-17[/tex] J.
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D
A student mixes a tablespoon of powdered lemonade into 8 ounces of
water. She weighs the powdered lemonade and the water separately.
After mixing, the student finds the weight of the combined mixture.
Which of the following will the student most likely observe about the
weight of the mixture?
A. The weight of the mixture will be less than the combined weight
of the powdered lemonade and the water.
B. The weight of the mixture will be the same as the combined
weight of the powdered lemonade and the water.
. C.The weight of the mixture will be more than the combined
weight of the powdered lemonade and the water.
. D. The weight of the mixture will be the average of the weight of
the powdered lemonade and the weight of the water.
●
●
The weight of the mixture will be the same as the combined
weight of the powdered lemonade and the water.
What is a mixture?The term mixture has to do with the combination of two or more substances that are not chemically combined together. We can see that due to the fact that substances that can be found in a mixture are not chemically combined together, then they can be separated by the means of physical methods.
We have to also bear in mind that mass can not be created nor destroyed but can be converted from one form to another. This implies that the total mass of the mixture must be the same as the sum of the masses of the individual components that are found in the mixture as this is in obedience to the law of the conservation of mass that have been detailed above in this answer.
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Why are chemical reactions used in the agricultural industry. Please cite all your sources.
Answer:
The objective of agricultural chemistry is to preserve or improve the fertility of soil, increase the agricultural yield and improve the quality of the crop. To reach those objectives the agricultural industry uses two types of chemicals.
- Fertilizers: increase soil fertility making crops more productive. They usually are compounds that contain three basic elements: P, K and N.
- Pesticides: control weeds (herbicides), insects (insecticides) and diseases from fungus (fungicides).
. At standard pressure, what state of matter is xenon at -111 °C?
A) solid
B) liquid
C) gas
D) can be both solid and liquid
E) can be both liquid and gas
At standard pressure, C) gas state of matter is xenon at -111 °C
What is the state of matter of xenon?Xenon is an extremely uncommon, odourless, colourless, tasteless, chemically inert gas. It was thought to be absolutely innocuous until Neil Bartlett published the synthesis of xenon haxafluoroplatinate in 1962. When stimulated by an electrical discharge, xenon generates blue light in a gas-filled tube.
Noble gases, which are most commonly encountered as monatomic gases, have entirely filled outer electron shells and hence have little desire to react with other elements, resulting in relatively few compounds with other elements.
In its +6 oxidation state, xenon trioxide is an unstable molecule. It is a highly potent oxidising agent that progressively liberates oxygen from water when exposed to sunshine. When it comes into touch with organic materials, it becomes highly explosive.
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In order to both shift the equilibrium and increase the amount of NH3, we should
Answer:
D. 2 and 3 only.
Explanation:
First let's remember the Le Chatelier's Principle: Le Chatelier's principle states that if a dynamic equilibrium is disturbed by changing the conditions, the position of equilibrium shifts to counteract the change to reestablish equilibrium.
Let's see the reaction:
[tex]N_2+3H_2\leftrightarrows2NH_3,\text{ }\Delta H=-92\text{ kJ.}[/tex]You can note that this reaction is exothermic. If we want the equilibrium to move to the left, we have to increase the temperature. In this case, we don't want that because we want to increase the concentration of NH3 and this means that the equilibrium goes to the right, so we have to decrease the temperature.
In the case of pressure, if we want to reach the equilibrium to the right, where is NH3, we have to increase the pressure because the pressure will move in such a way as to decrease the pressure again.
The answer would be D. 2 and 3 only.
Calculate the hardness of a water sample which is 35.1 ppm Mg2+ and 65.8 ppm Ca2+.
The hardness of water sample with 35.1 ppm Mg²⁺ and 65.8 ppm Ca²⁺ is 6.215 ppm is 100.9 ppm
Hardness of water is a parameter which is defined by the amount of dissolved minerals in the water like calcium and magnesium. Thus, hard water would have high amount of dissolved minerals in the water. They are sweeter in taste and are good for bones and teeth because of the mineral content
Total hardness of water = Degree of hardness of Mg ²⁺ + Degree of hardness of Ca ²⁺
Degree of hardness Mg ²⁺ = 35.1 ppm
Degree of hardness of Ca ²⁺ = 65.8 ppm
Total hardness = 35.1 + 65.8 = 100.9 ppm
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A patient receives 100 mL of 25% (m/v) mannitol solution every hour.How many grams of mannitol are given in 1 hour?Express your answer using two significant figures.
Explanation:
A patient receives 100 mL of a 25 % m/v mannitol solution every hour. We have to find the mass in grams of mannitol that the pacient is receiving in 1 hour. We can use the formula of the mass/volume percent to find the answer to our problem.
% m/v = mass of solute in g/(volume of solution in mL) * 100 %
We know the concentration of the solution and we have the volume of solution in mL, so we can solve the formula for the mass of solute and get the answer to the problem.
25 % m/v = mass of solute in g/100 mL * 100 %
mass of solute in g = 25 * 100/100 g
mass of solute in g = 25 g
Answer: In 1 hour the patient receives 25 g of mannitol.
Using the balanced equation:3 Ag2S + 2 Al -> Al2S3 + 6 Ag0.88 moles of Ag2S = ? grams Ag
Answer: 189.5g of Ag would be produced from 0.88 moles of Ag2S
Explanation:
The question requires us the amount of Ag, in grams, that would be produced from 0.88 moles of Ag2S, according to the following equation:
[tex]3Ag_2S+2Al\rightarrow Al_2S_3+6Ag[/tex]To solve this problem, which is a mol to mass stoichiometry problem, we'll need to follow the steps:
moles of Ag2S → moles of Ag → mass of Ag
To do that, we'll need to use the molar mass of Ag (107.87 g/mol) and the mole ratio between Ag2S and Ag, as given by the balanced chemical equation (6 moles of Ag are produced from 3 moles of Ag2S).
We can calculate the number of moles of Ag that would be produced from 0.88 moles of Ag2S as:
3 mol Ag2S -------------------------- 6 mol Ag
0.88 mol Ag2S --------------------- x
Solving for x, we'll have:
[tex]x=0.88mol\text{ Ag}_2S\times\frac{6mol\text{ Ag}}{3mol\text{ Ag}_2S}=1.76mol\text{ Ag}[/tex]Therefore, 1.76 moles of Ag would be produced from 0.88 moles of Ag2S.
Next, we need to convert the number of moles of Ag calculated to its correspondent mass. Knowing that the molar mass of Ag is 107.87 g/mol, we can calculate:
[tex]\begin{gathered} number\text{ of moles = }\frac{mass\text{ \lparen g\rparen}}{molar\text{ mass \lparen g/mol\rparen}}\rightarrow mass\text{ = number of moles}\times molar\text{ mass} \\ \\ mass\text{ = 1.76mol}\times107.87g/mol=189.8g \end{gathered}[/tex]Therefore, 189.5g of Ag would be produced from 0.88 moles of Ag2S.
What change to the device would increase the amount of light energy it is converting?
A. adding magnets into the bulb
OB. increasing the size of the bulb
C. increasing the size of the vanes
D. changing the vanes to be all silver
Which statement describes the hydrogen bonds in an ethanol molecule? (image attached)thank you :)
Answer
Only the hydrogen atom attached to the oxygen atom is capable of forming hydrogen bonds. A dipole does not form between the hydrogen and the carbon atoms.
Explanation
The description of the hydrogen bonds in an ethanol molecule is that hydrogen bonding can occur between ethanol molecules, although not as effectively as in water. The hydrogen bonding is limited by the fact that there is only one hydrogen in each ethanol molecule with a sufficient δ+ charge.
Therefore only the hydrogen atom attached to the oxygen atom is capable of forming hydrogen bonds. A dipole does not form between the hydrogen and the carbon atoms.
The second option is the correct answer.
I do not know how to find out what pairs will make an ionic bond, i am also confused on the difference between a covalent bond and ionic.
In simple terms a covalent bond is when we have sharing of electrons, which means there is no polarity being formed when the elements are bonded, this is more likely to occur with atoms with high electronegativity, or same pair of elements, like O2, where we have O - O (Oxygen bonded with Oxygen), since they have the same electronegativity, there is no charge being formed
The same can not be told for ionic bonds, where we have very different elements being bonded together, with a big electronegativity difference, which means we have polarity being formed (which basically means that we have charge in the compound)
One way to find out if a compound is covalent or ionic is by checking their positions in the periodic table, for example, let's analyze our question
We have:
A) Fluorine - Fluorine, here we have a classical example of covalent bond, since there is no "stronger" element, pulling the electrons towards its side, they are the same, hence, the same strength
B) Carbon - Chlorine, we have two non-metals, with a relatively high electronegativity each one of them, so there is ions being formed, therefore it is covalent
C) Potassium - Oxygen, in this case we have a metal and non-metal bonding together, and since potassium has only 1 electron in its valence shell, it will easily give up this electron to another element, therefore K will receive a positive charge (which means loss of electron) and oxygen will receive a negative charge (which means gain of electron), and this is an ionic bond
D) Oxygen - nitrogen is the same case as letter B
It is also possible to check an electronegativity table, in which there are some rules that helps you understand if a compound is more likely to be covalent or ionic
Your spaceship has docked at a space station above Mars. The temperature inside the space station is a carefully controlled 24 ∘C at a pressure of 745 mmHg . A balloon with a volume of 443 mL drifts into the airlock where the temperature is − 95 ∘C and the pressure is 0.115 atm . What is the final volume, in milliliters, of the balloon if n does not change and the balloon is very elastic?
Answer: the final volume of the balloon is 2.26 x 10^3 mL
Explanation:
The question requires us to determine the new volume of a balloon, given the initial and final conditions.
The following information was provided by the question:
initial temperature = T1 = 24 °C = 297.15 K
initial volume = V1 = 443 mL
initial pressure = P1 = 745 mmHg = 0.980 atm
final temperature = T2 = -95 °C = 178.15 K
final pressure = P2 = 0.115 atm
To solve this problem, we'll need to apply the equation of ideal gases to calculate the number of moles of gas in the balloon, and then use this value and the final temperature and pressure provided to determine the final volume,
The equation of ideal gases can be written as:
[tex]PV=nRT[/tex]And we can rearrange it to calculate the number of moles:
[tex]PV=nRT\rightarrow n=\frac{PV}{RT}[/tex]Applying the values provided by the question:
[tex]n=\frac{(0.980atm)\times(443mL)}{R\times(297.15K)}=\frac{1.46}{R}(\frac{atm\times mL}{K})[/tex]Now, we can rearrange the equation of ideal gases to calculate the volume:
[tex]PV=nRT\rightarrow V=\frac{nRT}{P}[/tex]And, applying the values provided and the number of moles as calculated:
[tex]V=\frac{(\frac{1.46}{R}atm.mL.K^{-1})\times R\times(178.15K)}{0.115atm}=2.26\times10^3mL[/tex]Therefore, the final volume of the balloon is 2.26 x 10^3 mL.
does lead melt in atoms or molecules
Answer:
Atoms
Explanation:
Answer:
atoms
Explanation:
its right, trust
How many moles are in 53.99 mg chromium?
How many liters of oxygen gas are required to burn 6.82 L of acetylene (C2H2) at STP?
17.05 L of O₂ are needed to react with 6.82 L of acetylene gas C₂H₂ at STP.
The reaction to the given question is :
2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O
From the equation we see
2 moles of C₂H₂ react with 5 moles of O₂
According to the equation,
2 liters of Acetylene reacts with = 5 liters of O₂
So,
6.82 L Acetylene will produce = X L of O₂
Solving for X,
X = ( 6.82 L × 5 L ) ÷ 2 L
X = 17.05 L of O₂
Thus, 17.05 L of O₂ is needed to react with 6.82 L of acetylene gas C₂H₂.
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Co-60 is used medically for radiation therapy as implants and as an external source of radiation exposure. The half-life of
Co-60 is 5, 272 years. How much of a 2.000 mg sample will remain after 21, 088 years? You must show your work to receive
credit.
. Show the equation needed
b. Show a picture of you solving for the unknown.
c. Show the final answer
Co-60 is used medically for radiation therapy as implants and as an external source of radiation exposure the half-life of Co-60 is 5, 272 years 2.000 mg sample will remain after 21, 088 years is 0.0625 gm left
Radiation therapy is the cancer treatment that uses high doses of radiation to kill cancer cell and shrink tumor
Here given data is Co-60 is 5, 272 years and we have to find the number of half lives in 21, 088 years = ?
21, 088/5, 272 = 4 half lives
(1/2)⁵ = 1/32 nd of the original will be left
1/32×2.000mg = 0.0625 gm left
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a gas has a volume of 103.4 L at 27.5 atm. what will it’s volume be if the pressure is changed to 69.3 atm
In this question, we have a gas presenting volume and pressure, and the gas law that we can use to calculate it is Boyle's gas Law, which perfectly correlates both pressure and volume, the formula is:
P1V1 = P2V2
We have:
P1 = 27.5 atm
V1 = 103.4 L
P2 = 69.3 atm
V2 = ?
Now we add these values into the formula:
27.5 * 103.4 = 69.3 * V2
V2 = 41.0 L
how many moles of electrons are needed to produce 53.5 mol of Zn(s)
The moles of electrons are needed to produce 53.5 mole of Zn is 107 moles.
What are electrons?Electrons are defined as a subatomic particle having a negative charge that makes up the nucleus of an atom together with protons and neutrons.
The electron has an intrinsic angular momentum of a half-integer number and has a mass that is around 1/1836th that of the proton. The quantum state of any two electrons cannot be identical.
The chemical reaction for solid zinc is
Zn²⁺ + 2e⁻ = Zn (s)
When one mole of zinc ions receive two moles of electrons, one mole of zinc is created.
Electrons equal two moles to form one mole of solid zinc.
The electrons needed to create the 53.5 mole of zinc will provide 2 53.5 = 107 mol.
Thus, the moles of electrons are needed to produce 53.5 mole of Zn is 107 moles.
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What element has the most similar property as fluorine
Answer:
Chlorine and Bromine are also halogens so they are similar to fluorine
A sheet of gold weighing 10.7 g and at a temperature of 19.8°C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3°C. What is the final temperature of the combined metals? Assume that no heat is lost to the surroundings.
A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.
given that :
weight of gold , m= 10.7 g
temperature, T = 19.8 °C
weight of iron , m = 18.7 g
temperature, T = 53.3 °C
final temperature t = ?
specific heat for gold , c = 0.12 J/ g °C
specific heat for iron , c = 0.45 J/ g °C
now, using the specific heat formula we get :
( mc ΔT ) + ( mc ΔT ) = 0
( 10.7 × 0.12 ×( t - 19.8 ) + ( 18.7 × 0.45 × (t - 53.3 ) = 0
(1.28 t - 25.4) + ( 8.41 t - 448.2 ) = 0
9.69 t = 473.6
t = 48.87 °C
Thus, A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.
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Determine which of the following electron configurations are not valid:
1.) 1s²2s²2p 3s 3p 4s²4d¹04p5
2.) 1s²2s²2p 3s³3d5
3.) [Ra] 7s²5f8
4.) [Kr] 5s24d105p5
The electron configurations that are not valid among the options are 1s²2s²2p 3s 3p 4s²4d¹04p5 and 1s²2s²2p 3s³3d5. Options 1 and 2.
Electron configurationsThe electron configuration of atoms using the various orbital levels follows the order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p.
Also, according to Afbau principle, orbitals with low energy levels are filled with electrons before orbitals with higher energy levels.
Using the above, 1s²2s²2p 3s 3p 4s²4d¹04p5 is incorrect for some reasons:
4d, a higher energy level orbital, comes before 4p. 3s and 3p, lower energy level orbitals have no electrons in them while higher energy level orbitals have electrons in them.1s²2s²2p 3s³3d5 is incorrect because:
a lower energy level orbital, 2p is not filled before a higher energy orbital, 3s.3p and 4s orbitals should come before 3d orbital.The remaining electron configurations are correct with correctly placed electrons in the various orbitals.
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Propane (C3H8) is a component of natural gas and is used in domestic cooking and heating. It burns according to the following reaction:
C3H8 + O2 → CO2 + H2O
a. Balance the equation representing the combustion of propane in air.
b. How many grams of carbon dioxide can be produced by burning 20.0 pounds of propane, the typical size of a BBG grill propane tank?
Assume that oxygen is the excess reagent in this reaction.
A. The balanced equation for the reaction is given as
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
B. The mass (in grams) of carbon dioxide that can be produced by burning 20.0 pounds of propane is 27216.49 g
A. Balance equation
The balanced equation for the combustion of propane is:
C₃H₈ + 5O₂ -> 3CO₂ + 4H₂O
B. How to determin the mass (in grams) of CO₂ produced
The mass (in grams) of CO₂ produced from the reaction can be obtained as follow:
Molar mass of C₃H₈ = (12 × 3) +(8 × 1) = 44 g/molMass of C₃H₈ from the balanced equation = 44 × 1 = 44 g = 44 / 453.592 = 0.097 poundMolar mass of CO₂ = 12 + (16 × 2) = 44 g/molMass of CO₂ from the balanced equation = 3 × 44 = 132 gFrom the balanced equation above,
0.097 pound of C₃H₈ reacted to produce 132 g of CO₂
Therefore,
20 pound of C₃H₈ will react to produce = (20 × 132) / 0.097 = 27216.49 g of CO₂
Thus, the mass of CO₂ produced is 27216.49 g
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In a 250 mL sealed container at 150℃, 0.50 mol of both iodine gas I2(g) and bromine gas, Br2(g) are mixed and allowed to react until they form an equilibrium with iodine monobromide gas IBr(g). The equilibrium constant for this reaction is 1.2 x 102. What are the equilibrium concentrations for iodine gas and bromine gas? I2(g) + Br2(g) ↔ 2IBr(g)
answer and explanation
now that we have the x value we can find the equilbrium concentratoins of tehegases
for Iodine
x =0.456
= 0.5-x
= 0.5-0.456
= 0.035mols
concentration = 0.035mols/ 0.250L
= 0.14M
for Bromine
x =0.456
= 0.5-x
= 0.5-0.456
= 0.035mols
concentration = 0.035mols/ 0.250L
= 0.14M
the concentration of the two gases is 0.14M
Parts of a neuron include:
A. dendrites.
B. hormones.
C. cortexes.
D. collosums.
The parts of the neuron include (A) dendrites.
What are dendrites?Dendrites are appendages that are designed to receive communications from other cells. They take the shape of projections with a tree-like structure that are triggered by other neurons and carry the electrochemical charge to the cell body. These occupy a large surface area of a neuron.These little appendages convey electrical stimulation to the soma and take in information from neighboring neurons. Synapses are also found on dendrites.Dendrites are also called the "arms" of a neuron.As it is given in the description, Synapses are also found on dendrites.
Therefore, the parts of the neuron include (A) dendrites.
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Convert 8.75X10^-4 to regular number
To convert the given number to regular notation, we have to move the decimal dot as many times as indicated by the exponent of 10. In this case, that exponent is -4, so we have to move the decimal dot 4 times to the left:
It means that the answer is 0.000875.
8. Based on the Law of Conservation of Matter: At the start of the reaction 20g of
one material and some amount of another material were reacted and produced
30g of solid and 70g of a gas. What is the other amount of reactant used?
a. 20
b. 60g
c. 80g
d. 100g
Answer:
80g
Explanation:
The law of conservation of matter states that matter cannot be created nor destroyed. Basically, whatever mass you have at the beginning of a reaction, should be the same as at the end of the reaction on the product side.
Since here it lets you know that a total of 100g (30g + 70g) were produced on the product side, that means that we started off with 100g in our reactant side.
We have given that one material is 20g on our reactant side but we need the mass of the other. To find the mass of the other material, simply subtract 20g from the total mass created on the product side.
100g - 20g = 80g
The 80g would be the missing amount from the reactant side that isn't stated.
The chemical equation for the combustion of ethanol is as follows:C2HyOH + 302 - 2002 + 3H20
5998kJ
Explanations:Given the reaction between ethanol and oxygen expressed as:
[tex]C_2H_5OH+3O_2\rightarrow2CO_2+3H_2O[/tex]For the product
We have 2 moles of CO2 and 3 moles of water. The total bond energy in the product is expressed as:
[tex]\begin{gathered} \triangle H_p=2(2C=O)+3(2O-H) \\ \triangle H_p=4(799)+6(467) \\ \triangle H_p=3196+2802 \\ \triangle H_p=5998kJ \end{gathered}[/tex]Hence the total energy transferred to build all the bond energy in the product is 5998kJ
