Answers
The enthalpy : 320.3 kJ/mol
Further explanationThe change in enthalpy in the formation of 1 mole of the elements is called enthalpy of formation
The enthalpy of formation measured in standard conditions (25 ° C, 1 atm) is called the standard enthalpy of formation (ΔHf °)
Based on the principle of Hess's Law,
the change in enthalpy of a reaction will be the same even though it is through several stages or ways
Reaction
2Fe (s) + 3Cl₂ (g) → 2FeCl₃ (s) ∆H° = -800.0 kJ/mol x 2
4Fe (s) + 6Cl₂ (g) → 4FeCl₃ (s) ∆H° = -1600.0 kJ/mol
Si(s) + 2 Cl₂ (g) → SiCl₄ (s) ∆H° = -640.1 kJ/mol
Reverse
SiCl₄ (s) → Si(s) + 2 Cl₂ (g) ∆H° = 640.1 kJ/mol x 3
3SiCl₄ (s) → 3Si(s) + 6Cl₂ (g) ∆H° = 1920.3 kJ/mol
------------------------------------------------------------------------ +
3 SiCl₄ (s) + 4 Fe (s) → 4 FeCl₃ (s) + 3 Si (s) ∆H° = 320.3 kJ/mol
The enthalpy for the formation of 4 moles of \(\rm FeCl_3\) has been 320.3 kJ/mol.
The enthalpy of formation of 1 mole at standard temperature and pressure has been termed the standard enthalpy of formation.
The reaction enthalpy to be calculated has reactants of 3 moles of \(\rm SiCl_4\), and 4 moles of Fe.
The enthalpy for the formation of \(\rm SiCl_4\) has been -640.1 kJ/mol.
The enthalpy for the dissociation of \(\rm SiCl_4\) has been the reverse of the formation reaction = +640.1 kJ/mol.
The enthalpy for the dissociation of 3 moles of \(\rm SiCl_4\) has been = 3 \(\times\) 640.1 kJ/mol.
The enthalpy for the dissociation of 3 moles of \(\rm SiCl_4\) has been = 1920.3 kJ/mol.
The enthalpy for the formation of 2 moles of \(\rm FeCl_3\) = -800 kJ/mol
The enthalpy for the formation of 4 moles of \(\rm FeCl_3\) = -1600 kJ/mol.
The final reaction has 3 moles of \(\rm SiCl_4\), and 4 moles of \(\rm FeCl_3\).
Thus, the final enthalpy of reaction will be: 1920 kJ/mol + (-1600 kJ/mol)
The final enthalpy of reaction will be = 320.3 kJ/mol.
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Related Questions
which of the following best describes colloids?
A. clear, flawless substances
B. clear, pure substances
C. dark, black substances
D. sticky, creamy substance
nonsense=report T_T
Answers
Answer: it's definitely b since its the one that makes the most sense plus i look it it up and im certain it is B
Please help.
What is the solubility of KCI in 400.g of 50 degrees Celsius? First, find the value for 100g H2O
Answers
According to solubility, the solubility of KCI in 400.g of 50 degrees Celsius is 168 g.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.As per given equation, 42×400/100=168 g.
Thus, the solubility of KCI in 400.g of 50 degrees Celsius is 168 g.
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A balanced equation has
Answers
Answer:
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total charge is the same for both the reactants and the products.In other words, the mass and the charge are balanced on both sides of the reaction.
Explanation:
A student decides to jump off a skateboard toward the east. Based on the action-reaction forces, which direction will the skateboard most likely move when she jumps off?
Answers
Answer:
l
Explanation:
Based on the action-reaction forces, the skateboard will most likely move towards west when she jumps off.
What is a force?Force is defined as a cause which is capable of changing the motion of an object. It can cause an object which has mass to change it's velocity. It is also simply a push or a pull . It has both magnitude as well as direction.Hence, it is a vector quantity.
It has SI units of Newton and is represented by'F'.Newton's second law states that force which acts on an object is equal to momentum which changes with time. If mass of object is constant, acceleration is directly proportional to net force acting on an object.
The concepts which related to force are thrust and torque .Thrust increases the velocity of an object and torque produces change in rotational speed of an object.
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Which statement best describes the temperature of the ocean's surface water?
Answers
Can someone explain to me the meaning of reaction rate and rate constant :)
Answers
Answer:
Reaction Rate is the reaction rate or reaction is the speed at which chemical reaction takes place.
Rate constant is the chemical kinetics a reaction rate constant or reaction rate
During a volcanic eruption, lava flowed at a rate of 37 m/min. At this rate how far in kilometers
can lava travel in 45 minutes?
Answers
Consider the titration of 25.0 mL of 0.340 M HCl with 0.160 M NaOH. What volume of NaOH is required to reach the equivalence point?
Answers
Answer:
53.1 mL NaOH
Explanation:
Net ionic equation for potassium sulfide and magnesium iodide
Answers
The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.
To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.
Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):
K2S -> 2K+ + S2-
Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):
MgI2 -> Mg2+ + 2I-
Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):
K+ + I- -> KI
Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):
Mg2+ + S2- -> MgS
Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:
2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS
To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).
Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:
S2- + Mg2+ -> MgS
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which action describes chemical weathering
A. Water carving out a limestone cave
B. Water cutting downward to deepen a river channel
C. Water freezing and thawing to widen cracks in rock
D. Water depositing beach sand
(Note: This is from Earth Science)
Answers
Answer:
A
Explanation:
just took the test and it’s right
The action that best describes chemical weathering is water carving out a limestone cave.
CHEMICAL WEATHERING:
Weathering generally means the breakdown of rocks into smaller particles. Weathering can occur either chemically or mechanically. Chemical weathering is caused by chemical reactions involving water. Water reacts with minerals in rocks and dissolves it into new substances. Therefore, the action that best describes chemical weathering is water carving out a limestone cave.Learn more at: https://brainly.com/question/18346756?referrer=searchResults
A filtration system continuously removes water from a swimming pool, passes the water through filters, and then returns it to the pool. Both pipes are located near the surface of the water. The flow rate is 15 gallons per minute. The water entering the pump is at 0 psig, and the water leaving the pump is at 10 psig.
A. The diameter of the pipe that leaves the pump is 1 inch. How much flow work is done by the water as it leaves the pump and enters the pipe?
B. The water returns to the pool through an opening that is 1.5 inches in diameter, located at the surface of the water, where the pressure is 1 atm. How much work is done by the water as it leaves the pipe and enters the pool?
C. "The system" consists of the water in the pump and in the pipes that transport water between the pump and the pool. Is the system at steady state, equilibrium, both, or neither?
Answers
Answer:
A . \(\mathbf{W = 7133.2 \dfrac{ft. lb_f}{min} }\)
B. \(\mathbf{W = 4245.24 \dfrac{ft. lb_f}{min} }\)
C. The system is at steady state but not at equilibrium
Explanation:
Given that:
The volumetric flow rate of the water = 15 gallons per minute
The diameter of the pipe that leaves the pump is 1 inch.
A. The objective here is to determine how much work flow is done by the water as it leaves the pump and enters the pipe
The work flow that is said to be done can be expressed by the relation :
W = P × V
where;
P = pressure
V = volume
Also the given outlet pressure is the gauge pressure
The pressure in the pump P is can now be expressed by the relation:
\(P_{absolute} = P_{guage} + P_{atmospheric}\)
\(P_{absolute}\) = 10 psig + 14.7 psig
\(P_{absolute}\) = 24.7 psig
W = P × V
W = 24.7 psig × 15 gal/min
\(W = (24.7 \ psig * \dfrac{\frac{lb_f}{in^2}}{psig}) * ( 15 \frac{gal}{min}* \dfrac{0.1337 \ ft^3}{1 \ gal }* \dfrac{144 \ in^2}{1 \ ft^2})\)
\(\mathbf{W = 7133.2 \dfrac{ft. lb_f}{min} }\)
Thus ; the rate of flow of work is said to be done by the water at \(\mathbf{W = 7133.2 \dfrac{ft. lb_f}{min} }\)
B.
Given that :
The water returns to the pool through an opening that is 1.5 inches in diameter.
where the pressure is 1 atm.
Then ; the rate of work done by the water as it leaves the pipe and enter the pool is as follows:
W = P × V
W = 1 atm × 15 gal/min
\(W = 1 \ atm * ( 15 \frac{gal}{min}* \dfrac{0.1337 \ ft^3}{1 \ gal }* \dfrac{144 \ in^2}{1 \ ft^2})\)
\(\mathbf{W = 4245.24 \dfrac{ft. lb_f}{min} }\)
Thus ; the rate of flow of work done by the water leaving the pipe and enters into the pool is at \(\mathbf{W = 4245.24 \dfrac{ft. lb_f}{min} }\)
C.
We can consider the system to be at steady state due to the fact that; the data given for the flow rate and pressure doesn't reflect upon the change in time in the space between the pump and the pool.
On the other-hand the integral factor why the system is not at equilibrium is that :
the pressure leaving the pipe is different from that of the water at the surface of the pool as stated in the question.
c6h12o6 + 6o2 > 6 co2 + 6h2o
How many molecules of C6h12o6 are needed to produce 18 molecules of co2?
A: 3
B: 9
C: 12
D: 18
Answers
Answer:
A or 3 would be the right answer
32. If
represents an oxygen atom and
below about the following equation:
+
∞
represents a hydrogen atom, pick the correct statement
A. The model is correct because it shows the same number of atoms on each side.
B. The model is correct because it shows the correct composition of water.
C. The model is incorrect because the structure of oxygen is incorrect.
D. The model is incorrect because the structure of water is incorrect.
Answers
Answer:
B
Explanation:
it is the correct composition of water
What volume would 0.435 moles of hydrogen gas, Hz, occupy at STP?
Answers
Answer:
will be 9.7 Liters
Explanation:
All alkali metals react with water to produce hydrogen gas and the corresponding alkali metal hydroxide. A typical reaction is that between lithium and water: 2Li(s) + 2H2O(1) 2LiOH(aq) + H2(g) How many grams of Li are needed to produce 9.89 g of H₂ ?
Answers
Answer:
69.23g
Explanation:
Find out how many moles is in 9.89g of H2.
number of moles = mass(g) / molar mass
1 is the molar mass of hydrogen (to the nearest whole)
relative molecular mass of H2: 2*1 = 2
number of moles of H2 = 9.89/2 = 4.945
1 mol of H2 is produced from 2 mol of Li
so
4.945 mol of H2 produces 9.89 mol of Li
mass(g) = number of moles * molar mass
7 is the molar mass of Lithium (to the nearest whole)
mass = 9.89 * 7 = 69.23
69.23 grams of Li are needed to produce 9.89 of H2
When dinitrogen pentaoxide, a white solid, is heated, it decomposes to produce nitrogen dioxide gas and
oxygen gas. If a sample of dinitrogen pentaoxide produces 1.618 g of oxygen gas, calculate the volume
of nitrogen dioxide formed at 103.25 kPa and 22.75 °C.
Answers
9.5314 L is the volume of nitrogen dioxide formed at 103.25 kPa and 22.75 °C.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
Oxygen produced - 1.618 gram
Decomposition of \(N_2O_5\) takes place.
Find - Amount of \(NO_2\) produced.
The decomposition reaction is as follows -
\(2N_2O_5\)--> \(4NO_2 + O_2\)
Moles of \(O_2\) gas =\(\frac{1.6}{16}\) =0.1 moles.
1 mole of \(O_2\) is produced from 2 moles of dinitrogen pentoxide
0.1 mole of \(O_2\) will be produced from = 0.2 moles.
Now, 2 moles of dinitrogen pentoxide produce 4 moles of \(NO_2\)
\(NO_2\) produced will be - 0.4 moles.
Weight of \(NO_2\) produced - 0.4 X 46
Weight of \(NO_2\) produced - 18.4 gram
Thus, grams of \(NO_2\) produced are 18.4
Now calculate the volume of \(NO_2\)
Given data are:
P=103.25 kPa =1.01899827 atm
T= 22.75 °C +273 = 295.75 K
n=0.4 moles
V=?
R= 0.0821 liter·atm/mol·K
Putting the value in PV=nRT
V = \(\frac{nRT}{P}\)
V = \(\frac{0.4 \;moles \;X \;0.0821\; liter\;atm/\;mol \;K X \;295.75 \;K}{1.01899827 atm}\)
V= 9.5314 L
Hence, 9.5314 L is the volume of nitrogen dioxide formed at 103.25 kPa and 22.75 °C.
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Imagine that you mix 25 g of water at 25 ºC with 25 g of water at 65 ºC. Predict the final temperature of the sample.
Answers
The final temperature of the mixture given that 25 g of water at 25 °C is mixed with 25 g of water at 65 °C, is 45 °C
How do i determine the final temperature of the mixture?The final temperature of the mixture can be obtained by calculating the equilibrium temperature of the mixture. This is shown below:
Mass of cold water (M) = 25 gTemperature of cold water (T) = 25 °CMass of warm water (Mᵥᵥ) = 25 gTemperature of warm water (Tᵥᵥ) = 65 °CEquilibrium temperature (Tₑ) =?Heat loss by warm water = Heat gain by cold water
MᵥᵥC(Tᵥᵥ - Tₑ) = MC(Tₑ - T)
Cancel out C
Mᵥᵥ(Tᵥᵥ - Tₑ) = M(Tₑ - T)
25× (65 - Tₑ) = 25 × (Tₑ - 25)
Cancel out 25
65 - Tₑ = Tₑ - 25
Collect like terms
65 + 25 = Tₑ + Tₑ
90 = 2Tₑ
Divide both side by 2
Tₑ = 90 / 2
Tₑ = 45 °C
Thus, we can conclude that the final temperature the mixture is 45 °C
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1. HCI (aq) + NaOH (aq) → NaCl (aq) + H₂O (1)
a. What are the reactants?
b. What are the products?
Answers
In the given reaction, the reactants are hydrochloride acid (HCI) and sodium hydroxide (NaOH). The products are sodium chloride (NaCl) and water.
The chemical equation provided represents a neutralization reaction between hydrochloric acid (HCI) and sodium hydroxide (NaOH) in aqueous solution.
A neutralization reaction is a type of double displacement reaction in which an acid and a base react to form salt and water.
The reactants in this equation are hydrochloric acid (HCI) and sodium hydroxide (NaOH). Hydrochloric acid is a strong acid that dissociates in water to form hydrogen ions (H+) and chloride ions (Cl-). Sodium hydroxide, on the other hand, is a strong base that dissociates in water to form sodium ions (Na+) and hydroxide ions (OH-).
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Draw the structure of phosphatidylserine and discuss its components
Answers
Phosphatidylserine is a type of phospholipid that is mainly found in cell membranes. Its structure is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule.
The fatty acid chains are hydrophobic, meaning they repel water, while the phosphate group and serine molecule are hydrophilic, meaning they attract water.
The glycerol molecule acts as a bridge that connects the two fatty acid chains to the phosphate group and serine molecule.
The structure of phosphatidylserine is important for its function in the cell membrane.
Because of the hydrophobic and hydrophilic components of its structure, phosphatidylserine is able to form a lipid bilayer, which is a barrier that separates the inside of the cell from the outside environment.
The hydrophilic heads of the phosphatidylserine molecules face outward and interact with water, while the hydrophobic tails face inward and repel water.
Phosphatidylserine also plays a role in cell signaling and apoptosis, which is programmed cell death.
It acts as a signaling molecule by binding to proteins that are involved in cellular pathways.
In addition, phosphatidylserine is translocated to the outer leaflet of the cell membrane during apoptosis, which signals to immune cells that the cell is ready to be removed.
In conclusion, the structure of phosphatidylserine is made up of two fatty acid chains, a phosphate group, a serine molecule, and a glycerol molecule. Its hydrophobic and hydrophilic components allow it to form a lipid bilayer in cell membranes, and it also plays a role in cell signaling and apoptosis.
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Which item is made from a basic ingredient?
Soap
Tea
Wine
Vinegar
2
Answers
Answer:
vinegar is your answer
Explanation:
i took the test
F2(g) + Ga2O(aq) →
Plz help
Answers
Answer:
6F2 ( g ) + 2Ga2O ( aq ) → 4GaF3 + O2
F is more reactive than O, so F displaces O from Ga2O and forms GaF3.
Ga has a valency of 3, it need 3 electrons to get complete electronic configuration.
F has a valency of 1,
3 F atoms constitutes 3 electrons.
So, GaF3.
And hence, the chemical equation is balanced on both sides.
To what volume should you dilute 50.0 ml of 12 m hno3 solution to obtain a 0.100 m hno3 solution?
Answers
Answer:
The answer is "6L"
Explanation:
Formula:
\(\bold{C_1 \times V_1 = C_2 \times V_2 }\\\\V_2= \frac{C_1\times V_1}{C_2}\)
Values:
\(\to C_1= 12 \ m\\\to V_1= 50 \ ml\\\to C_2= 0.100 \ m\\\\\\V_2= \frac{12 \times 50 }{0.100}\)
\(= \frac{12 \times 50 }{0.100}\\\\= \frac{12 \times 50 \times 1000}{100}\\\\= \frac{600 \times 1000}{100}\\\\= 600 \times 10\\\\=6000 \ ml\\= 6 \ L\)
What is a reaction rate?
Answers
Answer:
A reaction rate is generally the speed (or rate) at which a chemical reaction takes place. It is usually expressed in terms of volume or a unit of time.
Answer:
the speed at which a chemical reaction takes place
Select 2 that apply.
A synthesis reaction will be:
Answers
Answer:
where pic?
Explanation:
4.All of these are types of radioactive decay except
a. Alpha
b. Beta
c. Gamma
d. Delta
Answers
Good luck let me know if it’s right :)
An atomic physicist determines that an atom is composed of 8 positively charged particles and has a mass of 15 amu. Which is the best conclusion that can be drawn?
The atom has 7 neutrons and 8 protons.
The atom has 7 electrons and 8 protons.
The atom has 8 neutrons and 7 electrons.
The atom has 8 electrons and 7 protons.
Answers
Answer:
Explanation:
protons = mass - neutrons
protons are plus so there are 8 protons.
mass = 15
8 = 15 - neutrons
-7 = - neutrons
neutrons = 7
The first two answers are the same and both are correct.
Answer:
a
Explanation:
What is mass? In the shortest way possible
Answers
Answer:
Mass is the quantity of matter in a physical body.
Explanation:
mass bro
Answer:
a coherent, typically large body of matter with no definite shape.
Explanation:
a mass of curly hair
m A 10.00g sample of a substance is found to contain 5.12g of water. What is the percent by of water in the compound? A
. 5.12% B. 4.88% C. 48.8% D. 51.2%
Answers
Answer:
The answer is D) 51.2%
Explanation:
5.12g of 10.00g of the substance is water:
percentage of water= 5.12 x 10.00 =51.2%
Answer:
b
Explanation:
What will happen to the atom if more electrons are added to the atom? *
Answers
Atoms can lose or gain electrons due to collisions or other interactions. When they do, they form charged particles called ions : if the atom loses one or more electrons, it becomes a positively-charged ion. if the atom gains one or more electrons, it becomes a negatively-charged ion.
Convert 100.6 Kelvin to degrees C.
°C = K - 273
[?] °C
Answers
Answer:
-172.6 °C
Explanation:
You want to know the Celsius equivalent of the temperature 100.6 K.
ConversionThe relation is ...
C = K - 273.15
C = 100.6 -273.15 = -172.55
The temperature is -172.55 °C, about -172.6 °C.
__
Additional comment
We have rounded to tenths, because that is precision of the temperature given. If you use 273 as the conversion constant, you will get -172.4.