Answers
The question is incomplete, here is the complete question:
Consider the following intermediate reactions.
[tex]CH_4(g)+2O_2\rightarrow CO_2(g)+2H_2O(g);\Delta H_1=-802kJ[/tex]
The overall chemical reaction is as follows:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(I);\Delta H_{rxn}=-890kJ[/tex]
What is the correct enthalpy diagram using the Hess law for this system? (Image is attached below)
Answer: The correct image is Image A.
Explanation:
According to Hess’s law of constant heat summation, the amount of heat absorbed or evolved in a given chemical equation or system remains the same whether the process occurs in one step or in several steps.
According to this law, the enthalpies of these chemical equation can be treated as ordinary algebraic expression and can be added or subtracted to know the required equation.
It also means that the enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.
The given intermediate reactions are:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H_1=-802kJ[/tex] ...(1)
[tex]2H_2O(g)\rightarrow 2H_2O(l);\Delta H_2=-88kJ[/tex] ....(2)
The final reaction follows:
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l);\Delta H_{rxn}=-890kJ[/tex]
Negative sign of the enthalpy represents the heat is being released which is represented by the downward arrow in the diagram.
By adding equation 1 and equation 2, we get:
[tex]\Delta H_{rxn}=\Delta H_1+\Delta H_2\\\\\Delta H_{rxn}=-802+(-88)=-890kJ[/tex]
Hence, the correct image is image A.
Answer:
A
Explanation:
Edg
Related Questions
five more than one third of a number is nine .
Answers
Answer:
uh
Explanation:
5+x/3=9
=x/3=9-5
=x=12
A force that does not have a high amount of effect
Answers
Answer:
yes
Explanation:
its not that hard to get
In an experiment to displace
from copper sulfate, 6.5g of Zinc was
added to an excess of copper(ii) sulfate
Solution. The copper was fitered off,
washed and dried. The mass of
Copper obtained was 48 g. Calculate
the percentage yield of copper?
Answers
The percentage yield of copper = 76%
Further explanationGiven
6.5g of Zinc
The mass of Copper: 4.8 g
Required
The percentage yield of copper
Solution
Reaction
Zn+CuSO₄⇒Cu+ZnSO₄
mol Zn :
= mass : Ar Zn
= 6.5 g : 65,38 g/mol
= 0.0994
From the equation, mol ratio of Zn : Cu = 1 : 1, so mol Cu = 0.0994
Mass Cu (theoretical) :
= mol x Ar Cu
= 0.0994 x 63,546
= 6.316 g
%yield = (actual/theoretical) x 100%
%yield = (4.8/6.316) x 100%
%yield = 76%
2. How many moles are in 2.43 x 1024 particles of Carbon Monoxide
(CO)?
Answers
Answer:
= 14.63 × [tex]10^{45}[/tex] particles.
Explanation:
According to Avogadro's priciple:
1 mole of any substance is 6.02 × [tex]10^{23}[/tex] particles
∴ 2.43 x [tex]10^{24}[/tex] moles × 6.02 × [tex]10^{23}[/tex]
= 14.63 × [tex]10^{45}[/tex] particles.
I hope this was clear and easy to understand.
What is produced when an acid and an alkali react?
A. Water and a base
B. Water and Carbon dioxide
C. Salt and a base
D. Salt and water
Answers
Write the name for CH2.
Answers
A simplified version of the Periodic Table of the Elements is provided. What type of elements would you most likely find in the circles portion?
Answers
Answer:
Transition elements are present in this region.
Explanation:
socratic For the following reaction, 25.6 grams of hydrochloric acid are allowed to react with 52.4 grams of barium hydroxide . hydrochloric acid(aq) barium hydroxide(aq) barium chloride(aq) water(l) What is the maximum amount of barium chloride that can be formed
Answers
Answer:
63.7g BaCl₂
Explanation:
Based on the chemical reaction:
2HCl + Ba(OH)₂ → BaCl₂ + 2H₂O
2 moles of HCl reacts per mole of barium hydroxide
To solve this question, we need to convert the moles of each reactant to moles and, using the chemical reaction, find limiting reactant as follows:
Moles Ba(OH)₂ - Molar mass: 171.34g/mol-
52.4g Ba(OH)₂ * (1mol / 171.34g) = 0.306 moles Ba(OH)₂
Moles HCl - Molar mass: 36.46g/mol-
25.6g HCl * (1mol / 36.46g) = 0.702 moles HCl
For a complete reaction of 0.702 moles HCl are required:
0.702 moles HCl * (1mol Ba(OH)₂ / 2mol HCl) = 0.351 moles of Ba(OH)₂
As there are just 0.306 moles, limiting reactant is Ba(OH)₂
That means the maximum amount of BaCl₂ produced is:
0.306 moles Ba(OH)₂ * (1mol BaCl₂ / 1 mol Ba(OH)₂) = 0.306 moles BaCl₂
In mass -Molar mass BaCl₂: 208.23g/mol-
0.306 moles BaCl₂ * (208.23g / mol) = 63.7g BaCl₂
the heat of fusion of aluminum is 95 cal/g. calculate how many grams of aluminum(already at its melting point) could be melted with 1,265,730 cal of energy (round your answer to two decimal places)
Answers
Given
Lf=latent heat of fusion of Al = 95 cal/g
Q = 1,265,730 cal
Required
mass of Aluminium
Solution
The heat to change the phase can be formulated :
Q = m.Lf (melting/freezing)
Input the value
1,265,730 cal = m . 95 cal/g
m = 1,265,730 cal : 95 cal/g
m = 13323.47 g
What is the name of a molecule which is composed of two
phosphorous atoms and four sulfur atoms?
Answers
The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
What is molecule ?According on the context, the word may or may not include ions that meet this requirement. A molecule is a collection of two or more atoms bound together by attractive forces known as chemical bonds.
A molecule is the smallest unit of any material that is composed of one or more elements and is capable of existing independently while maintaining all of the substance's physical and chemical characteristics. Further atom division occurs within molecules. For instance, the symbols for the oxygen atom and molecule are O and O2, respectively.
Thus, The name of a molecule which is composed of two phosphorous atoms and four sulfur atoms is phosphorus sulphide.
To learn more about molecule follow the link below;
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Identify the metals in period 3 on the periodic table
Answers
Answer:
Aluminum (Al) is the only metal in period 3 on the periodic table.
What are natural disasters that are NOT in Florida?
A: Tsunami
B: Earth quakes
C: Sand Storm
D: Hurricanes
E: Storm
Answers
The lattice energy for ionic crystals increases as the charge on the ions _____________ and the size of the ions __________________. Group of answer choices decreases, increases decreases, decreases increases, increases increases, decreases
Answers
Answer:
increases
and the 2nd one increases
2. K2SO4 + NaOH what comes next ?
Answers
Answer: [tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]
Explanation:
A double displacement reaction is one in which exchange of ions take place. The salts which are soluble in water are designated by symbol (aq) and those which are insoluble in water and remain in solid form are represented by (s) after their chemical formulas.
The balanced chemical equation is:
[tex]K_2SO_4(aq)+2NaOH(aq)\rightarrow Na_2SO_4(aq)+2KOH(aq)[/tex]
Comparin
List three characteristics of chemical reactions
and three characteristics of nuclear reactions.
DONE
Answers
Answer:
Chemical reactions involve the loss, gain, or sharing of electrons, but do not involve changes to the nucleus of an atom. Nuclear reactions involve changes to the nucleus and produce a new particle. Chemical reactions involve low energy changes. Chemical reactions never involve a change in the mass of atoms.
List three characteristics of chemical reactions, I have five:
occur when bonds are broken and formed
atoms remain unchanged though they may be rearranged
involve only valence electrons
reaction rate is influenced by, temp, pressure, concentration, and catalyst
Three characteristics of nuclear reactions, I have five:
occur when nuclei emit particles
atoms are often converted into atoms of another element
may involve protons, neutrons, and electrons
reaction rate is not normally affected by temp, pressure or catalyst
Calculate the mass of vanadium(V) oxide (V2O5) that contains a billion (1.000e9) vanadium atoms. Be sure your answer has a unit symbol if necessary, and round it to 4 significant digits._______
Answers
Answer:
1.510 × 10⁻¹³ g
Explanation:
Step 1: Given data
Number of atoms of vanadium: 1.000 × 10⁹ atoms
Step 2: Calculate the molecules of V₂O₅ that contain 1.000 × 10⁹ atoms of V
Each molecule of V₂O₅ has 2 atoms of V.
1.000 × 10⁹ atom V × (1 molecule V₂O₅/2 atom V) = 0.5000 × 10⁹ molecule V₂O₅
Step 3: Calculate the moles corresponding to 0.5000 × 10⁹ molecules of V₂O₅
We will use Avogadro's number: there are 6.022 × 10²³ molecules of V₂O₅ in 1 mole of V₂O₅.
0.5000 × 10⁹ molecule × (1 mol/6.022 × 10²³ molecule) = 8.303 × 10⁻¹⁶ mol
Step 4: Calculate the mass corresponding to 8.303 × 10⁻¹⁶ moles of V₂O₅
The molar mass of V₂O₅ is 181.88 g/mol.
8.303 × 10⁻¹⁶ mol × 181.88 g/mol = 1.510 × 10⁻¹³ g
if a bike travels 23m at constant speed 5289s what is the bikes speed?
Answers
Answer:
0.004 m/s
Explanation:
Given data:
Distance traveled = 23 m
Time taken = 5289 s
Speed of bike = ?
Solution:
Formula:
speed = distance / time
b y putting values,
speed = 23 m/ 5289 s
speed = 0.004 m/s
The electron structure of atoms in elements A and C are 2, 8, 1 and 2, 8, 18, 7, respectively. The formula for the compound formed between A and C will be AC. True or false? pls help me T^T
Answers
describe some acidic oxides that can be prepared by the thermal decomposition of nitrates and carbonates
Answers
i need help with this
Answers
Answer:
It would be the last one because the way earth is tilted the sun rays would be pointing at the Northern Hemisphere more than the Southern Hemisphere
true or false
1. Average atomic mass is the mass of any atom based on its nuclear particles in relation to units measured in amu which is 1/12th of a carbon atom.
2. When calculating the average atomic mass of an element, the average atomic mass value falls closest to that of the least percentage abundance (least common) isotope.
Answers
Answer:
true
Explanation:
calculating the average atomic
Which of the following statements about tobacco use is not true?
a. Nicotine narrows blood vessels and puts added strain on the heart.
b. Smoking improves athletic performance.
c. Smoking can wreck lungs.
d. Nicotine in smokeless tobacco is addictive.
Answers
Explanation:
b and c statements are not true
if it helps you then plzz mark me brainliest
Answer:
B.) Smoking improves Athletic performance
Explanation:
Chemistry
Definition in your own words
Will check if you got it from online.
Word: Solid
Answers
Answer:
A solid is a matter that has particles that are closely packed which as a result makes it vibrate but not flow.
Is the cell wall factory part or worker? And please explain what the worker or factory part does. (Don’t tell me it’s on quizlet bc I can’t find it)
Answers
72.40% iron,27.60% Oxygen Empirical formula
Answers
Explanation:
Fe. O
72.40/ 56 27.60/16
____________________
1.29/1.29 1.725/1.29
_____________________
1. :. 1
Emperical formula = FeO
Empirical formula is the whole number ratios of elements in a compound. It can be found from the number of moles. The empirical formula of iron and oxygen of 72.4 % and 27.6 % respectively is Fe₂O₃.
What is empirical formula?Empirical formula of a compound is the chemical formula derived from the number of moles each element present in it. Whereas, molecular formula is derived from the actual masses of the elements present in the compound.
Empirical formula can be determined from the number of moles of the elements. It is given that the mass percentages of iron and oxygen are 72.40% and 27.60% respectively. This can be taken as 72.40 g and 27.60 g in a 100 g of compound.
Thus there is 72.40 g of iron. The atomic mass of Fe = 55.85 g/mol
Thus number of moles of Fe = 72.40 / 55.85
= 1.295
The weight of oxygen in 100 g of compound is 27.60 g. Atomic mass of oxygen is 16 g/mol.
Thus number of moles of oxygen = 27.60 /16 = 1.725
Taking the ratios of these number of moles = 1.295 :1.725 = 2 :3
Hence, the ratios of iron to oxygen is 2:3 which means the empirical formula of the compound is Fe₂O₃.
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What happens during chemical reactions?
O A. The total amount of energy changes
O B. Total mass increases in the products
O C. Energy is given off or absorbed
O D. Atoms are changed into new elements
Answers
Answer:
D. Atoms are changed into new elements.
Explanation:
atoms rearrange to form one or more different substances.
Hope that helps!!!
Sorry if its worng :(
Answer:
It's actually C. Energy is given off or absorbed.
Explanation:
"All chemical reactions involve changes in energy. This may be a change in heat, electricity, light, or other forms of energy. Reactions that absorb energy are endothermic. Reactions that release energy are exothermic."
-LibreTexts Chemistry
A species is a specific kind of living thing.
True
False
Answers
Answer:
I think the answer is true
John rode his bike down the street to the east. He rode 100 meters in 25
seconds. What was his velocity?
A. 0.25 m/s east
B. 25 m/s east
C. 10 m/s east
D. 4 m/s east
Answers
Answer:
The answer is D.
Explanation:
Given that velocity also applies speed formula, S = D ÷ T where D represents distance and T is time :
S = D ÷ T
S = 100m ÷ 25s
S = 4m/s
V = 4m/s east
The difference between speed and velocity is that speed has only magnitude but velocity has magnitude and direction.
How will you process the information in the table and on the map to
make predictions? Describe how you will use the inputs to develop
an output.
Help
Answers
Answer:
By measuring through scale
Explanation:
CAN YOU TELL THE NAME OF COUNTRY BECAUSE I AM FROM NEPAL
Can you help me with this 19 points
Answers
Answer:
21
Explanation:
To find the total atoms.
Multiply 3 *2 and you will get 6
Then multiply 3 * 5 and you will get 15.
You do this because there is 3 as a coefficient and is before the chemical compound. Furthermore, that means the same thing as a parenthesis.
Last of all, add 15 + 6 and you will get 21.
Therefore, there are a total of 21 atoms.