Answers
To determine the enthalpy of reaction for the given reaction, use Hess's Law, which states that the total enthalpy change of a reaction is independent of the pathway between the initial and final states.
How to determine the enthalpy of reaction?Break the given reaction into a series of steps for which the enthalpy changes are known or can be measured experimentally.
Add the enthalpy changes of each step to determine the overall enthalpy change for the reaction.
For example, determine the enthalpy of formation for A₂X₄(l), X₂(g), and AX₃(g) and use them to calculate the enthalpy of reaction for the given equation.
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Related Questions
Gas Laws
Pre-Test Active
1
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O final pressure
O atmospheric pressure
O combined pressure
O partial pressure
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A scientist is measuring the pressure that is exerted by each of the following gases in the atmosphere: carbon dioxide,
oxygen, and nitrogen. Which term most likely describes what she is measuring?
Answers
The term that the scientist would use in this case is partial pressure. Option D
What is the partial pressure?
The pressure that one particular gas component within a mixture of gases exerts is referred to as partial pressure. It is the pressure that the gas would experience at the same temperature if it were the only thing in the entire volume.
When researching gas mixtures, such as in gas laws, gas phase equilibria, and gas collecting methods, partial pressures are extremely crucial for the gas.
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3. A Wilkinson’s catalyst is widely used in the hydrogenation of alkenes. Show a catalytic cycle, including: i. chemical structure of the catalyst, with complete stereochemistry ii. molecular geometry of catalyst iii. type of reactions involved iv. the appropriate starting material, reagent and solvent v. major and minor end-products vi. all intermediates, for each reaction stated in (iii)
Answers
We can see here that the catalytic cycle for the hydrogenation of alkenes using Wilkinson's catalyst involves several steps.
What are the steps involved?Here's an overview of the catalytic cycle, including the necessary details:
i. Chemical structure of the catalyst:
Wilkinson's catalyst, also known as chloridotris(triphenylphosphine)rhodium(I), has the following chemical structure: [RhCl(PPh3)3]
ii. Molecular geometry of the catalyst:
The Wilkinson's catalyst has a trigonal bipyramidal geometry around the rhodium center. The three triphenylphosphine (PPh3) ligands occupy equatorial positions, while the chloride (Cl) ligand occupies an axial position.
iii. Type of reactions involved:
The catalytic cycle involves several reactions, including:
Oxidative addition: The rhodium center undergoes oxidative addition, reacting with molecular hydrogen (H2) to form a dihydride intermediate.Alkene coordination: The alkene substrate coordinates to the rhodium center, forming a π-complex.Hydrogenation: The coordinated alkene undergoes hydrogenation, resulting in the addition of hydrogen atoms to the double bond and formation of a metal-alkyl intermediate.Reoxidation: The metal-alkyl intermediate reacts with a hydrogen molecule to regenerate the rhodium dihydride species.iv. Starting material, reagent, and solvent:
The starting material is an alkene, and the reagent is Wilkinson's catalyst ([RhCl(PPh3)3]). The reaction is typically carried out in a suitable solvent, such as dichloromethane (CH2Cl2) or tetrahydrofuran (THF).
v. Major and minor end-products:
The major end-product of the hydrogenation reaction is the fully saturated alkane, resulting from the addition of hydrogen across the double bond. The minor end-product may include cis- or trans-configured alkanes if the original alkene substrate possesses geometric isomers.
vi. Intermediates:
The intermediates in the catalytic cycle include:
Rhodium dihydride complex: [RhH2(PPh3)3]Alkene-Rhodium π-complex: [Rh(η2-alkene)(PPh3)3]Metal-alkyl intermediate: [Rh(alkyl)(PPh3)3]These intermediates play a crucial role in facilitating the hydrogenation reaction and enabling the catalytic cycle to proceed.
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na2o3 is nitrogen trioxide why
Answers
Answer:
Because it contains 2 molecules of nitrogen and 3 molecules of oxygen
Explanation:
Another sample of eggshell reacts completely with 4.0 mL of an HCl(aq) solution of unknown concentration. If the reaction produced 0.095 atm of gas, the concentration of the HCl(aq) solution was at least (A) 0.0020 M (B) 0.050 M (C) 0.50 M (D) 1.0M
Answers
The concentration of the HCl (aq) solution was at least 1.0 M.
What is concentration?The abundance of a constituent divided by the sum of the mixture's volumes is the definition of concentration in chemistry. There are several different categories of mathematical description: mass concentration, molar concentration, number concentration, and volume concentration
P = 0.095atm(corresponds to 0.20g of CaCO3
so,moles of CaCO3 =0.20g/100gmol⁻¹=0.002moles
moles of HCl =(molesₓCaCO3ₓ2)=0.002ₓ2
M=0.004/4ₓ100
Concentration of HCl=1M
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A model shows that the moon has grown to twice its size, yet it has remained in the same place. In one to two sentences, explain how this would impact the gravity between Earth and the moon.(2 points)
pls help
Answers
It would make the planet's tilt harder to change, which would mean a more stable climate, which “just means maybe ice ages wouldn't happen as often,” he told me.
What is climate?The average weather throughout a region's long term, usually 30 years, is called the climate. More precisely, it is the mean and variability of meteorological variables over a period of time that can range from a few months to many millions of years. Temperature, humidity, air pressure, wind speed, and precipitation are a few of the meteorological parameters that are frequently observed.
Climate, in a larger sense, refers to the interactions between the atmosphere, hydrosphere, cryosphere, lithosphere, and biosphere as well as their status as parts of the climate system. Latitude/longitude, topography, altitude, land use, and the presence of surrounding water bodies and their currents all have an impact on a place's climate.
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Identify when an object has a kinetic energy of zero joules.
Question 2 options:
A. as a pendulum swings downward.
B. when the energy has been destroyed.
C. just after a ball it leaves your hand pitching a ball.
D. when an object is no longer in motion.
Answers
Answer:
D I think
Explanation:
cuz 0 j means there is nothing moving
Answer:
D. when an object is no longer in motion.
Explanation:
if two substance are at the same temperature, their enthalpy
Answers
Answer:
cannot be measure
Hope this helps :) !!!
Assuming ideal solution behavior, what is the boiling point of a solution of 115.0 g of nonvolatile sucrose (table sugar), C₁₂H₂₂O₁₁ (342.300 g/mol), in 350.0 g of water (Kb = 0.512 °C m⁻¹; boiling point = 100.0 °C)?
a.)
100.00049 °C
b.)
99.5 °C
c.)
268.2 °C
d.)
100.5 °C
Answers
The boiling point of water is 100.0 °C, the boiling point of the solution will be : 101.49 °C.The correct answer is option (a) 100.00049 °C.
Ideal Solution : An ideal solution is a homogeneous mixture of two or more components that obeys Raoult's law, which states that each component's vapor pressure is proportional to its mole fraction.The boiling point of a solution depends on the solvent's properties and the solute's concentration. It's dependent on the mole fraction of the solvent and solute, as well as the total concentration of the solution. The change in boiling point of a solution is given byΔTb = Kb × m × i, whereKb = ebullioscopic constant, m molarity of the solution, and i = van't Hoff factor.Assuming that the solution's behavior is ideal, we may use the molality of the solution to compute the boiling point elevation of the solution.The molality of the solution is given by the following formula:m = (n₂ / m₂) ÷ (n₁ / m₁), where n is the number of moles, m is the mass, and the subscripts 1 and 2 refer to water and non-volatile solute sucrose, respectively.The molar mass of sucrose (C₁₂H₂₂O₁₁) is342.3 g/mol; therefore, the number of moles of sucrose is115.0 g ÷ 342.3 g/mol = 0.335 mol.m₁ = mass of water = 350.0 g, and m₂ = mass of sucrose = 115.0 g, as given in the problem.Therefore, the molality of the solution is given by:m = (0.335 mol / 0.115 kg) ÷ (1 mol / 1 kg) = 2.91 mol/kg.Substituting these values in the formula for ΔTb, we get:ΔTb = Kb × m = 0.512 °C m⁻¹ × 2.91 mol/kg = 1.49 °C.100.0 °C + 1.49 °C = 101.49 °C.
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OH- of a solution that has a pH of 8.57
Answers
Answer:
I think its -8.75
Explanation:
Hope this helps!11
Define, giving examples of
Binary ionic Compound:
Answers
Answer:
A binary ionic compound contains an ion that is a metal (cation) and an ion that is a nonmetal (anion).
Explanation:
Tell me if its wrong
2H2 + O2 --> 2H2OHow many moles of hydrogen gas are needed to produce 120g of water?
Answers
6.67moles
Explanations:
Given the balanced chemical reaction between hydrogen and oxygen expressed as:
\(2H_2+O_2\rightarrow2H_2O\)First, you need to calculate the moles of water produced.
\(\begin{gathered} \text{Moles}=\frac{Mass}{\text{Molar mass}} \\ \text{Moles of water=}\frac{120}{2(1)+16} \\ \text{Moles of water}=\frac{120}{18} \\ \text{Moles of water}=6.67\text{moles} \end{gathered}\)Based on stochiometry, 2 moles of hydrogen produces 2 moles of water, hence the moles of hydrogen that will be needed to produce 120g of water is 6.67moles
Household ammonia used for cleaning contains about 10 g (two significant figures) of NH3 in 100 mL (two significant figures) of solution. What is the molarity of the NH3 in the solution?
Answers
Answer:
11.44
Explanation:
= Base ionization constant of ammonia =
m = Mass of ammonia = 5 g
V = Volume of ammonia = 709 mL =
M = Molar mass of ammonia = 17.03 g/mol
Molaritiy of ammonia
We have the relation
The pH of the solution is 11.44.
Explanation:
If 0.5 moles of hydrogen gas are produced how many molecules of hydrogen gas was made
Answers
We can use the relation between moles and number of molecules to find out how many hydrogen gas molecules (H2) were produced:
\(1\text{ mole = 6}\times10^{23}\text{ molecules}\)In this case, 0.5 moles of H2 were produced, so we can set the following proportion:
\(\begin{gathered} 1\text{ mole-----6}\times10^{23}\text{ molecules} \\ 0.5\text{ moles----x molecules} \\ \\ x=\frac{6\times10^{23}\times0.5}{1}=3\times10^{23}\text{ molecules } \end{gathered}\)So, we have produced 3x10^23 molecules of hydrogen gas.
\(\begin{gathered} \frac{600}{2}=300 \\ \frac{6\times10^2}{2}=3\times10^2=300 \end{gathered}\)
Which of the ions Pd2+ , Ru2+ , Rh3+, and Hg2+ has an electron configuration of nd6 (n=3,4,5,…) ?
Answers
The ion with an electron configuration of nd6 is Pd²+.
The electron configuration of an atom or ion is the dispersion of electrons in its orbitals. It describes how electrons are grouped in an atom's or ion's many energy levels and sublevels.
The number of electrons in each energy level and sublevel is often shown in shorthand notation in the electron configuration. Carbon's electron configuration, for example, can be represented as:
1s² 2s² 2p²
This means that carbon has a total of 6 electrons, with 2 in the 1s orbital, 2 in the 2s orbital, and 2 in the 2p orbital.
An ion's electron configuration may differ from that of its parent atom due to electron loss or gain.
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please help this is timed.
What is the total number of complete waves in the graph below
Answers
Answer:
2
Explanation:
you go from the middle line where it starts until you hit where it starts the pattern so if you took that shape it and flipped the bottom part it makes a big, complete oval
I hope this helped :))
Using a triple beam balance and a graduated cylinder, a student collected data on a sample of an element:Mass of sample = 18.9 gVolume of water = 30.0 mLVolume of water and sample = 35.0 mL..... using SigFig Rules *
Answers
The question is incomplete; the complete question is;
Using a triple beam balance and a graduated cylinder, a student collected data on a sample of an element:
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Calculate the density of the sample using sig figs.
Answer:
3.8 g/mL
Explanation:
Mass of sample = 18.9 g
Volume of water = 30.0 mL
Volume of water and sample = 35.0 mL
Volume of the sample = 35.0 mL – 30.0 mL = 5.0 mL
D = m/v
D = 18.9 g / 5.0 mL =3.8 g/mL
The following reaction is investigated: 2N2O(g) N2H4(g) <---> 3N2(g) 2H2O(g) Initially there are 0.100 mol of N2O and 0.25 mol of N2H4, in a 10.0-L container. If there are 0.059 mol of N2O at equilibrium, how many moles of N2 are present at equilibrium
Answers
Answer:
6.2 × 10^-2
Explanation:
Given the reaction:
------------2N2O(g) N2H4(g) <---> 3N2(g) 2H2O(g)
Initial: N2O = 0.1, N2H4 = 0.25-- 0 - - - - - 0
Then: N20 = -2x, N2H4= - x - - - +3x, +2x
Equ : 0.1 - 2x ; 0.25 - x ; +3x ; +2x
At equilibrium :
Add both:
N2O = 0.1 - 2x ;
N2H4 = 0.25 - x;
3N2 = 3x
2H2O = 2x
Moles of N2O at equilibrium = 0.059
Then;
0.1 - 2x = 0.059
-2x = 0.059 - 0.1
-2x = - 0.041
x = 0.041 / 2
x = 0.0205
Moles of N2 present at equilibrium ;
3N2 = 3x
3N2 = 3(0.0205)
= 0.0615
= 0.062 = 6.2 × 10^-2
Guysss how to explain nuclear chemistry? And define nuclear chemistry ?
Answers
Answer:
How do amoeba respire.
Define Diffusion.
What is the empirical formula for a compound if 300.00 g of it is known to contain 82.46224 g of molybdenum, 45.741 g of chlorine and the rest is bromine
Answers
Answer:
MoClBr₂
Explanation:
First we calculate the mass of bromine in the compound:
300.00 g - (82.46224 g + 45.741 g) = 171.79676 gThen we calculate the number of moles of each element, using their respective molar masses:
82.46224 g Mo ÷ 95.95 g/mol = 0.9594 mol Mo45.741 g Cl ÷ 35.45 g/mol = 1.290 mol Cl171.79676 g Br ÷79.9 g/mol = 2.150 mol BrNow we divide those numbers of moles by the lowest number among them:
0.9594 mol Mo / 0.9594 = 11.290 mol Cl / 0.9594 = 1.34 ≅ 12.150 mol Br / 0.9594 = 2.24 ≅ 2Meaning the empirical formula is MoClBr₂.
The gas in a 250.0 mL piston experiences a change in pressure from 1.25 atm to 2.00 atm. What is the new volume (in mL) assuming the moles of gas and temperature are held constant?
Answers
Answer:
The new volume of the gas is 156.25 mL.
Explanation:
According to Boyle's Law, at constant temperature and number of moles, the pressure and volume of a gas are inversely proportional.
So, we can use the following equation to solve for the new volume (V2):
P1V1 = P2V2
Where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.
Substituting the given values:
(1.25 atm) x (250.0 mL) = (2.00 atm) x V2
Solving for V2:
V2 = (1.25 atm x 250.0 mL) / (2.00 atm)
V2 = 156.25 mL
Therefore, the new volume of the gas is 156.25 mL.
Which portion of a molecule of F2O has partial positive charge?
Question 3 options:
A)
The F atoms
B)
The central O atom
C)
The partial charge on each atom is zero
D)
The partial charge on each atom is negative
Answers
The partial charges on each fluorine atom are negative. Option B) The central O atom is the correct answer. Option B
The partial charges in a molecule are determined by the electronegativity values of the atoms involved. Electronegativity is the ability of an atom to attract electrons towards itself in a chemical bond. In the case of \(F_2O\), fluorine (F) is more electronegative than oxygen.
Fluorine is the most electronegative element on the periodic table, meaning it has a high ability to attract electrons. Oxygen is also relatively electronegative but less so than fluorine. When fluorine atoms bond with oxygen, the shared electrons will be pulled more towards the fluorine atoms, creating a polar covalent bond.
In \(F_2O\), each fluorine atom will pull the shared electrons towards itself, resulting in a higher electron density around the fluorine atoms. This creates a region of partial negative charge around the fluorine atoms.
Conversely, the oxygen atom will have a region of lower electron density and, therefore, a partial positive charge. This is because the shared electrons spend more time around the fluorine atoms due to their higher electronegativity.
Option B
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name the chemical compound
Answers
Answer:
hydrochloric acid
Explanation:
chemical compound any substance composed of identical molecules consisting of atoms
Two asteroids are 75,000 m apart one has a mass of 8 x 10^7 N what is the mass of the other asteroid
Answers
The mass of the asteroid is C. 1.2 x \(10^{12}\) Kg
To find the mass of the other asteroid, we can rearrange the equation for the gravitational force between two objects:
F = (G * m1 * m2) / \(r^{2}\)
where F is the force of gravity, G is the gravitational constant, m1 and m2 are the masses of the two asteroids, and r is the distance between them.
Given that the distance between the asteroids is 75000 m, the force of gravity between them is 1.14 N, and one asteroid has a mass of 8 x \(10^{7}\) kg, we can substitute these values into the equation and solve for the mass of the other asteroid (m2):
1.14 N = (6.67430 × \(10^{-11}\) N \(m^{2}\)/\(Kg^{2}\) * 8 x \(10^{7}\) kg * \(m2\)) / \((75000 m)^{2}\)
Simplifying and solving the equation, we find that the mass of the other asteroid (m2) is approximately 1.2 x \(10^{12}\) kg. Therefore, Option C is correct.
The question was incomplete. find the full content below:
Two asteroids are 75000 m apart one has a mass of 8 x \(10^{7}\) kg if the force of gravity between them is 1.14 what is the mass of the asteroid
A. 3.4 x \(10^{11}\) kg
B. 8.3 x \(10^{12}\) kg
C. 1.2 x \(10^{12}\) kg
D. 1.2 x \(10^{10}\) kg
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How many atoms are in 12 g of Carbon-12 (12C)?
Answers
There are approximately 6.022 × 10^23 atoms in 12 grams of Carbon-12 (12C).
The number of atoms in a given amount of a substance can be calculated using Avogadro's number, which represents the number of atoms or molecules in one mole of a substance. Avogadro's number is approximately 6.022 × 10^23.
Carbon-12 is a specific isotope of carbon, with an atomic mass of 12 atomic mass units (amu). One mole of Carbon-12 has a mass of 12 grams. Since one mole of any substance contains Avogadro's number of particles, in the case of Carbon-12, it contains 6.022 × 10^23 atoms.
Therefore, if we have 12 grams of Carbon-12, which is equal to one mole, we can conclude that there are approximately 6.022 × 10^23 atoms in this amount of Carbon-12.
In summary, 12 grams of Carbon-12 contains approximately 6.022 × 10^23 atoms. Avogadro's number allows us to relate the mass of a substance to the number of atoms or molecules it contains, providing a fundamental concept in chemistry and enabling us to quantify and understand the microscopic world of atoms and molecules.
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what is a collision and how does mass affects a collision
Answers
:)
Explanation:
A collision is the impact of 2 objects forcefully coming together in physical contact. So for example, a gold club and gold ball. The club comes in direct contact with the gold ball causing a collision. If the golf club had double the mass of the golf ball, it would result in the gold ball having twice the momentum even if they were moving at both the same speed and direction. Hope this helps explain a bit better!
What was the unknown metal?
Answers
Answer:
is there a picture or something?
Explanation:
Explanation:
Your question is incomplete please update it.
Phthalonitrile (C₈H₄N₂) is produced by the ammoxidation of o-xylene (C₈H₁₀) according to the following reaction:
C₈H₁₀(l) + O₂(g) + NH₃(g) → C₈H₄N₂(s) + H₂O(l)
How many moles of water would be produced by the complete ammoxidation of 145.0 grams of o-xylene?
Answers
0.6066 moles of water are produced by complete ammoxidation of 145 g of o-xylene.
How are number of moles calculated?Number of moles are calculated by dividing the mass by the molar mass of the substance.In the reaction between o-xylene ,ammonia and oxygen pthalonitrile is produced.
Here, the number of o-xylene is calculated by the above mentioned formula which is 1.365 moles.Then, as per stoichiometry and balanced chemical equation ,
1.365 moles of o-xylene×8 moles of water/1 mole of xylene ×18 g water
=0.6066 moles
Thus,0.6066 moles of water are produced from 145 g of o-xylene.
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A gas is at 35.0°C and 4.50 L. What is the temperature of the gas if the volume is increased to 9.00 L?
A gas is at 35.0°C and 4.50 L. What is the temperature of the gas if the volume is increased to 9.00 L?
65.0°C
343°C
17.5°C
1.16°C
614°C
Answers
Answer: 343 Celsius
Explanation:
Gay lussac law
T2=T1V2/V1 Temp must be in Kelvin
T2= 308.15 X 9.00 / 4.50 =616.30 K - 273.15 to get back in celsius
=343.15 C
The meaning of the word symptom:
Answers
The word "symptom" refers to a specific manifestation or indication of a condition, disease, or disorder that is experienced or observed by an individual.
Symptoms are subjective or objective changes in the body's normal functioning that may be recognized as abnormal, uncomfortable, or problematic. Symptoms can manifest in various ways depending on the nature of the underlying condition. They can be physical, such as pain, rash, cough, fever, or fatigue, indicating an illness or injury affecting the body. Symptoms can also be psychological, such as anxiety, depression, or confusion, reflecting disturbances in mental health.
Symptoms serve as important clues for medical professionals to identify and diagnose diseases or disorders. They provide valuable information about the nature, severity, and progression of an illness, helping healthcare providers formulate appropriate treatment plans. Additionally, symptoms may also be important for individuals to self-assess their own health status and seek appropriate medical attention.
It is essential to note that symptoms alone may not provide a definitive diagnosis, as they can overlap across different conditions. Further evaluation, including medical tests and examinations, is often necessary to confirm a diagnosis and determine the appropriate course of action.
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In the electrolysis of water, the 50 cm3 of a gas is obtained at the anode. a. Write the chemical equation. b. What is the gas obtained at the anode? c. What is the volume of gas obtained at the anode?
Answers
a. The chemical equation for the electrolysis of water is:
2H2O(l) → 2H2(g) + O2(g)
b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).
c. The volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.
a. The chemical equation for the electrolysis of water is:
2H2O(l) → 2H2(g) + O2(g)
b. The gas obtained at the anode during the electrolysis of water is oxygen (O2).
c. According to the balanced chemical equation, for every 2 moles of water (H2O) electrolyzed, 1 mole of oxygen gas (O2) is obtained. Since 1 mole of any gas occupies 22.4 L at standard temperature and pressure (STP), we can use the stoichiometry of the reaction to determine the volume of oxygen gas produced.
Given that 50 cm³ of gas is obtained at the anode, we need to convert this volume to liters:
50 cm³ = 50/1000 L = 0.05 L
Using the stoichiometric ratio of the balanced equation, we find that 2 moles of water produce 1 mole of oxygen gas. Therefore, 0.05 L of oxygen gas is equivalent to:
0.05 L × (1 mole/22.4 L) = 0.002232 moles
Thus, the volume of gas obtained at the anode is 0.002232 moles or approximately 0.05 L of oxygen gas.
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