Consider the intermediate chemical reactions.
2 equations. First: upper C a (s) plus upper C upper O subscript 2 (g) plus one half upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s). Delta H 1 equals negative 812.8 kilojoules. Second: 2 upper C a (s) plus upper O subscript 2 (g) right arrow 2 upper C a upper O (s). Delta H 2 equals negative 1, 269 kilojoules.
The final overall chemical equation is Upper Ca upper O (s) plus upper C upper O subscript 2 (g) right arrow upper C a upper C upper O subscript 3 (s).. When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation
When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
Let's consider the following intermediate chemical reactions.
Reaction 1: Ca(s) + CO₂(g) + ½O₂(g) → CaCO₃(s) ΔH₁ = -812.8 kJ
Reaction 2: 2 Ca(s) + O₂(g) → 2 CaO(s) ΔH₂ = -1269 kJ
We want to calculate the enthalpy of the following overall chemical equation.
CaO(s) + CO₂(g) → CaCO₃(s) ΔH = ?
We can apply Hess' law.
What is Hess' law?Hess' law states that regardless of the multiple stages or steps of a reaction, the total enthalpy change for the reaction is the sum of all changes.
To apply Hess' law in this case we have to:
Conserve equation 1 as is.Reverse equation 2 and multiply it by 1/2, thus changing the sign of its enthalpy and multiplying it by 1/2.Add both equations and their enthalpies.Ca(s) + CO₂(g) + ½ O₂(g) → CaCO₃(s) ΔH = -812.8 kJ
+
CaO(s) → Ca(s) + ½ O₂(g) ΔH = 634.5 kJ
--------------------------------------------------------------------------------------
CaO(s) + CO₂(g) → CaCO₃(s) ΔH = -178.3 kJ
When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation is halved and has its sign changed.
The complete question is as follows.
Consider the intermediate chemical reactions.
Ca (s) + CO₂ (g) + ½O₂ (g) → CaCO₃ (s) ΔH₁ = -812.8 kJ
2Ca (s) + O₂ (g) → 2CaO (s) ΔH₂ = -1269 kJ
The final overall chemical equation is
CaO (s) + CO₂ (g) → CaCO₃ (s) ΔH = ?
When the enthalpy of this overall chemical equation is calculated, the enthalpy of the second intermediate equation
is halved and has its sign changed. is halved. has its sign changed. is unchanged.Learn more about Hess' law here: https://brainly.com/question/11628413
Answer:
Consider the following intermediate reactions.
CH₄(g)+2O₂(g)⇒CO₂(g)+2H₂O(g) ΔH₁ = -802 kJ
2H₂O(g)⇒2H₂O(I) ΔH₁ = - 88 kJ
The overall chemical reaction is as follows.
CH₄(g)+2O₂(g)⇒CO₂(g)+2H₂O(I) ΔH₂ = -890 kJ
What is the correct enthalpy diagram using the Hess law for this system?
✔️ A←❌ B
❌ C
❌ D
A helium balloon contains 69.5 L of helium at sea level, where the atmosphere pressure is 101.3 kPa. The balloon is released frim a 4500 m mountaintop where the pressure is 61.7 kPa. What is the volume of the balloon when it takes off from the mountaintop
Answer:
THE NEW VOLUME WHEN THE BALLOON TAKES OFF FROM THE MOUNTAINTOP IS 114.1 L
Explanation:
The question follows Boyle's law of gas laws and it involves pressure and volume being inversely proportional to the volume. As pressure increases, the volume decreases and vice versa.
Mathematically represented as:
P1V1 = P2 V2
P1 = 101.3 kPa = 101.3 * 10^3 Pa
V1 = 69.5 L
P2 = 61.7 kPa = 61.7 * 10^3 Pa
V2 = ?
making V2 the subject of the formula. we have;
V2 = P1 V1 / P2
V2 = 101.3 *10^3 * 69.5 / 61.7 *10^3
V2 = 7040.35 / 61.7
V2 = 114.106 L
The volume at a decreased pressure of 61.7 kPa at the mountaintop is 114.1 L
This is in line with Boyle's law which shows that at high pressure, volume decreases and at low pressure, volume increases.
Answer:
The new volume is 114.1 L
Explanation:
Step 1: Data given
Volume of the helium balloon = 69.5 L
The atmosphere pressure is 101.3 kPa
The pressure decreases to 61.7 kPa
Step 2: Calculate the new volume
P1*V1 = P2*V2
⇒with P1 = the atmosphere pressure is 101.3 kPa
⇒with V1 = the initial volume = of the helium balloon = 69.5 L
⇒with P2 = the decreased pressure = 61.7 kPa
⇒with V2 = the new volume = TO BE DETERMINED
101.3 kPa * 69.5 L = 61.7 kPa * V2
V2 = (101.3 kPA * 69.5 L ) / 61.7 kPa
V2 = 114.1 L
The new volume is 114.1 L
How much H2 is generated from the electrolysis of 150 grams of H2O
Answer:
16.67 grams of H₂ is generated from the electrolysis of 150 grams of H₂O
Explanation:
Electrolysis is the decomposition of a chemical element under the effect of an electric current. So, electrolysis of water is the process of decomposing the H₂O molecule into separate oxygen and hydrogen gases due to an electric current passing through the water.
The balanced equation of electrolysis of water is:
2 H₂O → O₂ + 2H₂
Being:
H: 1 g/moleO: 16 g/molethen the molar mass of the compounds that participate in the reaction is:
H₂O: 2*1 g/mole + 16 g/mole= 18 g/moleH₂: 2*1 g/mole= 2 g/moleO₂: 2*16 g/mole= 32 g/moleIf the following amounts in moles are reacted by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction):
H₂O: 2 molesH₂: 2 molesO₂: 1 molethe amount of mass, by stoichiometry, that reacts and is produced is:
H₂O: 2 moles*18 g/mole=36 gH₂: 2 moles* 2 g/mole= 4 gO₂: 1 mole* 32 g/mole= 32 gThen you can apply the following rule of three: if by stoichiometry 36 g of H₂O generate 4 g of H₂, 150 g of H₂O how much mass of H₂ will it generate?
[tex]massofH_{2} =\frac{150 grams of H_{2}O*4 grams ofH_{2} }{36 grams of H_{2}O}[/tex]
mass of H₂= 16.67 grams
16.67 grams of H₂ is generated from the electrolysis of 150 grams of H₂O
Which of the following are social implications of an environmental policy? Check all that apply.
loss of jobs
poorer air quality
less erosion
cleaner water waste
higher taxes
elimination of tourist activities
Answer:
the correct answer is lost of jobs,higher taxes, and elimination of tourist activities
Explanation:
hope you have a blessed day:)
Answer:
the correct answer is lost of jobs,higher taxes, and elimination of tourist activities
Explanation:
thank you for the answer i hope EVERYONE has A BLESSED DAY!!!!!!!!!!!!!!!!!!!!!!
What happens to a neutral atom when an electron leaves
5) A solution has a pH of 1.5. What is the [H+]? *
0.0316
0.0679
0.00123
0.000954
Answer:
.0316
Explanation:
The formula is...
H+ = 10^-pH
- Hope that helps! Please let me know if you need further explanation.
How many mL of 0.5 M H2SO4 will neutralize 10 mL of 1.5 M NaOH?
0.75mL
30 mL
3 mL
15 mL
Answer:
15 mL
Explanation:
Please see the step-by-step solution in the picture attached below.
Hope this answer can help you. Have a nice day!
Look at these two molecular diagrams and think about the features of the compounds. (SEE PICTURE)
1. A chain of 5 C atoms is bonded to H above and below and to the left and the right, except that the 4th C is bonded to C H subscript 3 above instead of a plain H. 2. A chain of 4 C atoms is bonded to H above and below and to the left and the right, except the second C in the chain is bonded to C H subscript 3 above and below.
Which descriptions apply to these two compounds? Check all that apply.
are isomers of each other
have same molecular formula
have same structural formula
are both hydrocarbons
have same number of each kind of atom
have same geometric arrangement of atoms
Answer:
A, B, D, E
Explanation:
correct on Edge 2020
Answer:
1) are isomers of each other
2) are isomers of each other
4) are both hydrocarbons
5) have same number of each kind of atom
Explanation: edg 2020
among the elements given below , the element with the least electronegativity is:
I) lithium
2) carbon
3) boron
4) fluorine
Answer:
least electronegative or most electropositive from the group is Mr. Lithium
water is the only compound that commonly exists in the __ states on the earth
Answer: Water is the only known substance on Earth that exists naturally in three states: solid, liquid, and gas.
Explanation:
Cylinder A contains a gas whose molecules have an average speed of 0.0000001 meters/sec. Cylinder B contains a gas whose molecules have an average speed of 0.3 meters/sec. Select the statement below that is true regarding these cylinders. options: Cylinder A contains a gas that has a temperature closest to absolute zero. Even though the molecules are moving at different speeds in the two cylinders, they have the same kinetic energy. Cylinder B contains molecules that are moving more slowly than the molecules in Cylinder A. Cylinder B contains a gas that has a temperature closest to absolute zero.
Answer:
The correct option is;
Cylinder A contains a gas that has a temperature closest to absolute zero
Explanation:
From the kinetic theory of gases, the average speed of a gaseous molecule is found from the following equation;
[tex]v_{rms} = \sqrt{\frac{3\cdot R \cdot T}{MW} }[/tex]
Where:
[tex]v_{rms}[/tex] = rms speed which is the square root of the average of the velocities of the gas molecules squared which is used in place of the average of the gas molecules as the sum of the velocities of all the gas molecules in the cylinder is zero
R = Universal gas constant = 8.3145 J/(mol·K)
MW = Molecular weight of the gas
Hence where we have;
[tex]v_{rmsA}[/tex] = Average velocity of gas A = 0.0000001 m/s
[tex]v_{rmsB}[/tex] = Average velocity of gas B = 0.3 m/s
Since, R and MW are constant for the gas in cylinder A constant, therefore, as [tex]v_{rmsA}[/tex] ≈ 0 m/s, the temperature, [tex]T_A[/tex], of gas A is closest to absolute zero.
A gas has a volume of 3.25 liters at 54 C and 231 kPa of pressure. At what temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa?
Answer: 318 K
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 231 kPa
[tex]P_2[/tex] = final pressure of gas = 168 kPa
[tex]V_1[/tex] = initial volume of gas = 3.25 L
[tex]V_2[/tex] = final volume of gas = 4.35 L
[tex]T_1[/tex] = initial temperature of gas = [tex]54^oC=273+54=327K[/tex]
[tex]T_2[/tex] = final temperature of gas = ?
Now put all the given values in the above equation, we get:
[tex]\frac{231\times 3.25}{327}=\frac{168\times 4.35}{T_2}[/tex]
[tex]T_2=318K[/tex]
At 318 K of temperature will the same gas take up 4.35 liters of space and have a pressure of 168 kPa
Which has more total Heat Energy/
A.) A cup of HOT coffee
B.) A thermos of HOT coffee
C.) They both have the same amount to heat energy
Answer:
The thermos should have more heat energy because of the greater mass.
State duplet rule .
What are many earthquakes intended to do?
Answer:
rapid shaking of the earth, caused by the breaking and shifting of underground rock. Earthquakes can cause buildings to collapse and cause heavy items to fall, resulting in injuries and property damage.
Explanation:
Answer:
They tend to cause mass destruction, even destroy lots of building. I hope this helps you out.
Explanation:
which group are most stars found in
Answer:
The White Dwarfs are very hot stars, which are small in size and relatively dim. They are found in the lower left of the H-R Diagram. The Main Sequence is a band of stars, which includes most of the stars, like our Sun. These are usually smaller stars, often dwarf stars.
Explanation:
Answer:
Found along a region called the Main Sequence
Explanation: Main sequence starts vary widely in effective temperatures but the hotter they are the more luminous they are
How is the molar mass of an element different from the atomic mass of an element?
Please help with questions 7-12
Answer:
negitive 5 or -5
Explanation
usally 12-7 = 5 but 7 is first so it you turn 5 to negitive 5
or -5
if the element xenon applied for a job, what job would it apply for
Answer:
A photographer.
Explanation:
Xenon is used in photographic flashes.
Please help No Explanation needed. Its science please
Answer:
C, A, A, B, B
Explanation:
Question 5: C. continental drift
Question 6: A. new rock forms
Question 7: A. happens at deep-ocean trenches
Question 8: B. convection currents in the mantle
Question 9: B. convergent boundary
Sarah, Leah, Haley, Lindsay, and Kim bought 4 bottles of water to share among themselves. They divided each bottle of water into 5 equal portions. Sarah took 1 portion from each bottle of water.
Answer:
4/5 of a bottle
Explanation:
Sarah, Leah, Haley, Lindsay, and Kim bought 4 bottles of water to share among themselves. They divided each bottle of water into 5 equal portions. Sarah took 1 portion from each bottle of water. Which equation represents how much of a bottle of water Sarah took?
Sarah must have taken 4/5 of a bottle
First, the 4 bottles of water were divided into 5 equal portions;
4 x 5 = 20 portions.
Sara too 1 portion from each bottle;
1 portion x 4 bottles = 4 portions
Which equation represents how much of a bottle water Sarah took?
Since each bottle water was divided into 5 equal proportions and assuming that the bottle waters are of the same volumes, then Sarah has taken 4 out of 5 portions of a bottle water.
Answer: 4 ÷ 5 ﹦4/5 ♡♡♡
Explanation: When you see eqautions like these, always remember that the first number goes on the top and the second one goes on the bottom. Hope this helps! (～﹃～)~Hi☆
What is the Big bang Theory
Answer:
The Big Bang Theory is the leading explanation about how the universe began. At its simplest, it says the universe as we know it started with a small singularity, then inflated over the next 13.8 billion years to the cosmos that we know today.
Explanation:
You arrive in my class 45 seconds after leaving math which is 90 meters away. How fast did you travel?
Answer:
Speed is 2
Explanation:
Speed = distance ÷ time
90/45=2
Answer: 2
Explanation:
Distance/Time = Speed
The conditions of 1 atm pressure and 0°C are known as
5. What is the % of each element in Al2(Cro4)3?
Explanation:
Utiliza mayúsculas para el primer carácter en el elemento y minúsculas para el segundo carácter. Ejemplos: Fe, Au, Co, Br, C, O, N, F.
Puedes utilizar los paréntesis () o los corchetes [].
If a gas at 25.0 °C occupies 3.60 liters at a pressure of 1.00 atm, what will be its volume at a pressure of 2.50 atm?
Answer:
1.44 L
Explanation:
Since 25 is constant it is no use. Now, rearrange the gas formula. You should get...
P1V1/T2=P2V2T1
Next, rearrange to fit the problem. You should get...
V2=P1V1/P2
Fill in our values and solve. You should get 1.44 L
We can check this by knowing that P and V at constant T have an inverse relationship. Hence, this is correct.
- Hope that helps! Please let me know if you need further explanation.
Consider the nuclear equation below. Superscript 222 subscript 86 upper R n right arrow superscript 218 subscript question mark upper P o plus superscript 4 subscript 2 upper H e. Which is the missing value that will balance the equation? 84 86 88 90
Answer:
84
Explanation:
From the question given above, it is evident that 222 86Rn is emitting alpha particle since the daughter nuclei produced has a mass number lesser than 4 when compared to parent element.
Therefore, the miss value in the equation is 84.
Please see attachment for further details
Based on the calculations, the missing value that will balance the equation is: A. 84.
What is an alpha decay?An alpha decay is a type of nuclear reaction in which the atomic nucleus of a radioactive element emits an alpha particle (helium atom), thereby, producing chemical elements with a different atomic nucleus.
In this exercise, we are given the following nuclear equation with an alpha decay:
²²²R₈₆ -----> ²¹⁸Poₓ + ⁴He₂
For the subscript, we have:
86 - 2 = 84.
Read more on alpha decay here: brainly.com/question/23303931
#SPJ2
2.03
Which landform is created by flowing water
A.cirques
B.gullies
C.horns
D.dunes
Answer:
Gully
Explanation:
What is the charge on an electron?
Answer:
The answer is negative .
Why are rocks not alive
What Are Living Rocks? Rocks themselves are not alive. But in a coral reef rock-like lime substance is continually produced from the skeletons of dead rock corals and the shells of mussels and other creatures which are bound together by sponges and calcareous algae.
but tbh I have no idea lol!
