n2(g) 2o2(g)2no2(g) h° = 66.4 kj and s° = -121.6 j/k the equilibrium constant for this reaction at 257.0 k is
Answers
The balanced equation for the reaction is:N2(g) + 2O2(g) → 2NO2(g)Given that H° = 66.4 KJS° = -121.6 J/KThe standard free energy change (G°) at 298 K can be obtained using
the following formula G° = H° - T S°= 66.4 kJ - (298 K)(-121.6 J/K)= 66.4 kJ + 36.2 kJ= 102.6 The equilibrium constant can be obtained from the formula :K = e^(-G°/RT)Where :R = Gas constant = 8.314 J/mol.KT = Temperature = 257 K Let's substitute the values in the formula :K = e^(-G°/RT)K = e^(-102.6 kJ/mol / (8.314 J/mol.K)(257 K))= e^(-42380.74)= 1.43 x 10^-184:K = 1.43 x 10^-184And,The equilibrium constant for the reaction N2(g) + 2O2(g) → 2NO2(g) at 257 K is 1.43 x 10^-184. T
The equilibrium constant can be obtained from the formula: K = e^(-G°/RT), where R = 8.314 J/mol.K and T = 257 K. Substituting the values gives K = 1.43 x 10^-184.The explanation is that the equilibrium constant (K) is a measure of the ratio of the concentrations of products and reactants at equilibrium. The value of K depends on the standard free energy change (G°) of the reaction, which in turn depends on the enthalpy change (H°) and entropy change (S°) of the reaction
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Related Questions
Why would the same amount of gas be produced even if we increase the amount of baking soda?
Answers
Answer:
Explanation:
If you are not increasing the amount of vinegar, the adding more baking soda has nothing to react with. The limiting reagent is vinegar (or some other acid).
The usual reaction is
HC2H3O2 + NaHCO3 ===> NaC2H3O2 + HOH + CO2 which is the gas being expelled.
If you increase the NaHCO3 nothing more will happen until you increase the vinegar.
10. What is the mass, in grams, of 7.4 x 1024 atoms of carbon?
Answers
Answer:
9.45
⋅
10
24
molecules CH
3
OH
⋅
Avogadro's constant
1 mole CH
3
OH
6.022
⋅
10
23
molecules CH
3
OH
=
15.69 moles CH
3
OH
This question is about energy transfers. Which is the correct definition of conduction.'
(1 Point)
Transfer of thermal energy when particles in a heated fluid rise.
Transfer of thermal energy as a wave.
Transfer of thermal energy by the vibration of particles.
Answers
explain why the first ionization energy is much lower than the second ionization energy for an atom of sodium.
Answers
The lower first ionization energy of sodium is due to the relatively weak attraction between the outermost electron and the nucleus, as well as the shielding effect provided by the inner electrons.
The ionization energy refers to the amount of energy required to remove an electron from an atom or ion in its gaseous state. In the case of sodium, the first ionization energy is significantly lower than the second ionization energy. This can be explained by understanding the electron configuration and the principles of electron shielding and effective nuclear charge.
Sodium has an atomic number of 11, meaning it has 11 protons in its nucleus and 11 electrons surrounding it. These electrons are arranged in energy levels or shells, with the first shell containing 2 electrons and the second shell containing 8 electrons. The outermost electron in sodium is in the third energy level.
The first ionization energy is the energy required to remove the outermost electron from the atom. In sodium, this electron is relatively far from the nucleus and experiences less attraction to the positively charged protons.
Additionally, the outer electron in sodium experiences significant electron shielding from the inner electrons, meaning that the inner electrons partially shield the outer electron from the full attractive force of the nucleus.
As a result, it is easier to remove the outermost electron in sodium, and hence, the first ionization energy is relatively low. Once the outermost electron is removed, sodium becomes a positively charged ion (Na+).
The second ionization energy refers to the energy required to remove an electron from the Na+ ion, which now has a stronger effective nuclear charge due to the reduced electron-electron repulsion and decreased shielding effect. Consequently, it is more difficult to remove an electron from the Na+ ion, leading to a higher second ionization energy compared to the first ionization energy.
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Use the image to answer the question.
What is the name of the aluminum ion?
O A-1
O A1+2
O Al-3
O A1+3
Answers
A1+3
Explanation:
A1+3 is the most common ion of aluminum.
You are asked to prepare a nacl solution with the total volume of 50 ml. What is the best glassware for such purpose?.
Answers
For preparing a NaCl solution with a total volume of 50 ml, the best glassware to use would be a graduated cylinder.
Graduated cylinders are designed with clear and precise volume markings along their sides, allowing for accurate measurements of liquids.
With a 50 ml target volume, a graduated cylinder provides the necessary precision for measuring and mixing the correct amount of NaCl and solvent (usually water).
This glassware minimizes measurement errors and ensures the desired concentration of the solution. Its straightforward design and ease of use make the graduated cylinder a practical choice for small-volume solution preparation tasks.
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GAS LAW:
If 2.2 liter of hydrogen are heated from 0 degrees celsius to 95 degrees celsius at the constant pressure what is the new volume?
Answers
Answer:
bh yftd5xsdcfvgbhnjm
Explanation:
In the bohr model of the hydrogen atom, the energy required to excite an electron from n = 2 to n = 3 is _______________ the energy required to excite an electron from n = 3 to n = 4?
Answers
In the bohr model of the hydrogen atom, the energy required to excite an electron from n = 2 to n = 3 is greater than the energy required to excite an electron from n = 3 to n = 4
Bohr's energy levels:
The essential concept of Bohr's atomic model is that electrons occupy specified orbitals that call for the electron to have a certain amount of energy. An electron needs to be in one of the permitted orbitals and have the correct amount of energy needed for that orbit in order to be in the electron cloud of an atom. An electron would require less energy to orbit near the nucleus, while an electron would need more energy to orbit away from the nucleus. Energy levels are the potential orbits. One of Bohr's models' flaws was that he was unable to explain why just specific energy levels or orbits were permitted.
It is evident that the energy required to escape an electron from n=2 to n=3 is greater than the energy required to exit an electron from n=3 to n=4. This is because as n increases, the energy levels move closer to one another.
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Identify the compound with atoms that have an incomplete octet.
A) BF3
B) ICl5
C) CO2
D) CO
E) Cl2
Answers
The compound with atoms that have an incomplete octet is BF3.The correct answer is a.
An octet is a set of eight electrons in the outermost shell of an atom. Noble gases have an octet of electrons in their outermost shells, making them stable. Other elements aim to reach this stable state by either losing or gaining electrons. When they do this, they form ions.
In some cases, however, elements may share electrons to achieve an octet. This is called covalent bonding. In a covalent bond, atoms share valence electrons to reach the stable octet configuration.BF3 is an example of a compound that has atoms with an incomplete octet.
In BF3, boron has only six electrons in its outermost shell. This means that it cannot form an octet on its own. However, by sharing three electrons with three fluorine atoms, boron is able to achieve a stable configuration, even if it does not have a complete octet.
In contrast, the other compounds listed in the question all have atoms that have a complete octet or an expanded octet. For example, CO and CO2 both have atoms with a complete octet. ICl5 and Cl2 both have atoms with an expanded octet. Only BF3 has atoms with an incomplete octet.
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How many electrons will an element have if it has an atomic number of 20, an
atomic mass of 40 and a charge of +2? *
A.)40
B.)18
C.)22
D.)20
Answers
This is because the atomic number is the amount of protons. The number of protons equal the number of electrons in a neutral atom. But since it has a charge of +2, you subtract 2 from 20. +2 is a anion.
8. Which of the following symmetries are consistent with a two-dimensional crystal? O Translation; 1-, 2-,3- 4-, 5- and 6-fold rotations; reflection and glide. O Translation; 1-, 2-, 3-, 4- and 6-fold rotations; reflection; glide and screw. O Translation; 1-, 2-, 3-,4- and 6-fold rotations; reflection and glide. O Translation, 2-, 3, 4-, and 5 -fold rotations, reflection, glide.
Answers
The symmetries that are consistent with a two-dimensional crystal include translation; 1-, 2-, 3-, 4-, and 6-fold rotations; reflection and glide.
Therefore, the answer is option C: Translation; 1-, 2-, 3-, 4- and 6-fold rotations; reflection and glide.
Two-dimensional crystals consist of two-dimensional lattices that can be defined by their symmetries.
They have five fold and higher rotation axes prohibited by the crystallographic restriction theorem.
The seven crystal systems and the fourteen Bravais lattices can be used to classify two-dimensional lattices based on their symmetries. All seven crystal systems have been found in two-dimensional lattices.
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what charge would bromine obtained when it becomes an ion
Answers
When bromine becomes an ion, it obtains a negative charge. The reason behind this is that Bromine has a tendency to accept an electron to complete its octet, which results in the formation of the Br- ion.
The electronic configuration of Bromine is 2, 8, 18, 7Here, we see that Bromine has seven valence electrons. The tendency to complete the octet leads to the acceptance of one electron, which makes the Bromine ion have an electronic configuration of 2, 8, 18.
This configuration is similar to the nearest noble gas, Krypton. We can conclude that the Bromine ion has a negative charge.
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Bromine becomes a bromide ion with a charge of -1 when it gains an electron to fulfill the octet rule.
When bromine becomes an ion, it generally gains an electron to have a full outer electron shell in accordance with the octet rule. This gain of one electron increases its net charge by one negative unit, resulting in a bromide ion with a charge of -1. Keep in mind this is because halogen elements like bromine often become ions (anions specifically) by gaining an electron, not losing one.
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Which of the following describes Rutherford’s model of the atom?
A. Solid sphere like a marble but unique to the element it makes
B. Numerous positive charges floating around in a sea of negative charge (plum pudding)
C. Positive nucleus surrounded by a blob of negative charges
D. Positive nucleus surrounded by electrons in circular orbits
E. Positive nucleus surrounded by electron orbitals with complex 3-D shapes and assigned energies.
Answers
Answer: C. Positive nucleus surrounded by a blob of negative charges
PLEASE HELP AGAIN lol thank you :))
Answers
A twin-turbojet airplane is cruising with a speed of Mach 1.5 at an altitude where atmospheric pressure is 32989.5 Pa, temperature is 232.778 K. Each engine is consuming 200 kg of air per second. The engine exit flow has a pressure of 32,000 Pa with a velocity of 850 m/sec. The exit area of the engine nozzle is 1.4 m
2
. How much thrust both engines are generating?
Answers
A twin-turbojet airplane is cruising with a speed of Mach 1.5 at an altitude where atmospheric pressure is 32989.5 Pa, temperature is 232.778 K. Each engine is consuming 200 kg of air per second. The engine exit flow has a pressure of 32,000 Pa with a velocity of 850 m/sec. The exit area of the engine nozzle is 1.4 m². The thrust generating in both engines is 342,678.6 Newtons.
To calculate the thrust generated by both engines, we can use the momentum equation for a nozzle:
Thrust = mass flow rate * exit velocity + (exit pressure - ambient pressure) * exit area
Given:
Speed of the airplane (V) = Mach 1.5
Atmospheric pressure (\(P_a\)) = 32989.5 Pa
Ambient temperature (\(T_a\)) = 232.778 K
Mass flow rate of each engine (m) = 200 kg/s
Exit pressure of the engine (\(P_e\)) = 32000 Pa
Exit velocity of the engine (\(V_e\)) = 850 m/s
Exit area of the engine nozzle (\(A_e\)) = 1.4 m²
First, we need to calculate the ambient density using the ideal gas law:
PV = nRT
Since the speed of the airplane is given in terms of Mach number, we can calculate the speed of sound (a) using the following formula:
a = √(gamma * R * \(T_a\))
Where gamma is the specific heat ratio of air (approximately 1.4) and R is the specific gas constant for air (approximately 287 J/(kg K)).
Next, we can calculate the ambient density (ρ) using the equation:
ρ = \(P_a / (R * T_a)\)
Now, we can calculate the thrust generated by each engine using the momentum equation:
Thrust = m* \(V_e + (P_e - P_a) * A_e\)
Finally, we can calculate the total thrust generated by both engines by multiplying the thrust of a single engine by 2.
Calculate the speed of sound:
a = √(1.4 * 287 * 232.778)
a = 438.95 m/s
Calculate the ambient density:
ρ = 32989.5 / (287 * 232.778)
ρ = 1.383 kg/m³
Calculate the thrust of a single engine:
\(Thrust_s\) = 200 * 850 + (32000 - 32989.5) * 1.4
\(Thrust_s\) = 170000 + 1339.3
\(Thrust_s\) 171339.3 N
Calculate the total thrust of both engines:
\(Thrust_t\) = 2 * \(Thrust_s\)
\(Thrust_t\) = 2 * 171339.3
\(Thrust_t\) = 342678.6 N
Therefore, both engines are generating approximately 342,678.6 Newtons of thrust.
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define the acid rain for class 10 .???
Answers
Answer: Acid rain is caused by a chemical reaction that begins when compounds such as sulphur dioxide and oxides of nitrogen are released into the air. These substances can rise very high up into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants called acid rain.
Explanation:
If we had a hetergenous mixture of realgar and orpiment which by mass was 61.4 rsenic. by mass what percent of the mixture is realgar?
Answers
The mass percent of realgar in the mixture is 5.44%.
How to solve for the mass percentGiven the percent by mass of As in realgar (70.029%) and orpiment (60.903%), the percent by mass of As in the mixture (61.4%) can be represented as follows:
0.70029x + 0.60903(1 - x) = 0.614
Now we just need to solve this equation for x to find the percent by mass of realgar in the mixture.
0.70029x + 0.60903 - 0.60903x = 0.614
0.09126x = 0.614 - 0.60903
0.09126x = 0.00497
x = 0.00497 / 0.09126
x = 0.0544
So, the mass percent of realgar in the mixture is 5.44%.
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How does what you learned in this investigation help you explain why chefs measure the amount of ingredients they need before preparing foods?
Answers
Chefs measure the number of ingredients they need before preparing foods for accuracy, consistency, and balancing flavors.
Measurements ensure accuracy and consistency in recipes. Cooking is a precise process, and precise measurements of ingredients are crucial for achieving the desired taste, texture, and overall outcome of a dish. By measuring ingredients, chefs can replicate their recipes consistently, ensuring that each dish turns out as intended.
Certain ingredients, such as spices, seasonings, and acids, can greatly impact the taste of a dish. By carefully measuring these ingredients, chefs can maintain a precise balance of flavors.
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2. Do you think you would have to exercise longer to use the energy that can be released
from three grams of carbohydrate, fat or protein? Why?
Answers
Complete the sentence. The lower the hydrogen ion concentration, the ______ the pH. higher lower closer to 7 closer to 0
Answers
Answer:
the higher the pH
Explanation:
Answer:
Hes right i took the quiz
Explanation:
How many grams of magnesium hydroxide will precipitate if 25. 0 mL of 0. 235 M magnesium nitrate are combined with 30. 0 mL of 0. 260 M potassium hydroxide?
Answers
The grams of magnesium hydroxide will precipitate if the 25 mL of 0.235 M magnesium nitrate are combined with the 30. 0 mL of 0.260 M potassium hydroxide is 0.227 g.
The reaction is given as :
Mg(NO₃)₂ + 2KOH ----> 2KNO₃(aq) + Mg(OH)₂(s)
moles of Mg(NO₃)₂ = 0.235 × 0.025
= 0.00587 mol
moles of KOH = 0.260 × 0.030
= 0.0078 mol
1 mole of Mg(NO₃)₂ react with 2 mole of KOH
mole of KOH = 0.0078 × 2
= 0.0156 mol
KOH is the limiting reagent.
2 mole of KOH produces 1 mole of Mg(OH)₂
mole of Mg(OH)₂ = 0.0078 / 2 = 0.0039 mol
mass of Mg(OH)₂ = 0.0039 × 58.3
= 0.227 g
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Look at the following reaction:
2Al(s) + 3CuCl₂(aq) → 2AlCl3(aq) + 3Cu(s)
This is an example of what type of reaction?
O Single replacement
O Double replacement
ODecomposition
O Synthesis
Answers
Answer:
Single replacement
Explanation: Al is replacing Cu
how many bonding molecular orbitals are present in 1,3,5-hexatriene?
Answers
1,3,5-hexatriene contains three bonding molecular orbitals.
A conjugated hydrocarbon having a chain of six carbon atoms and three double bonds is known as 1,3,5-hexatriene.
The 1,3,5-hexatriene -system, which is made up of the overlapping p-orbitals of the carbon atoms engaged in the double bonds, must be taken into account in order to calculate the number of bonding molecular orbitals (MOs) in the compound.
A string of MOs is created when the electrons in a conjugated compound, like 1,3,5-hexatriene, are delocalized along the whole chain. There are two MOs one bonding molecular orbital and one antibonding molecular orbital for every double bond.
The compound 1,3,5-hexatriene contains three double bonds. Consequently, there will be three bonding molecular orbitals.
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Question 33 of 33
What is the formula for copper(II) chloride?
O A. Cuci
B. Cuci
O c. 2CUCI
O D. CuCl2
Answers
Answer:
CuCI2 is the answer.......
magnetic resonance spectroscopic measurement of cerebral gamma-aminobutyric acid concentrations in patients with bipolar disorders
Answers
Magnetic Resonance Spectroscopy (MRS): MRS is a non-invasive imaging technique that allows for the measurement of chemical concentrations in the brain. It uses magnetic fields and radio waves to detect the signals emitted by different chemicals in the brain.
Gamma-Aminobutyric Acid (GABA): GABA is an important neurotransmitter in the brain that helps regulate neuronal activity. It is involved in the inhibition of neuronal signals, which is crucial for maintaining a balance in brain function.
Bipolar Disorder: Bipolar disorder is a mental illness characterized by extreme shifts in mood, energy, and activity levels.
It is believed to be caused by a combination of genetic, environmental, and neurochemical factors.
Measurement of GABA Concentrations: The MRS technique allows researchers and clinicians to measure the concentration of GABA in the brain. By comparing the GABA levels in patients with bipolar disorder to those without the disorder, scientists
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threonine is a standard amino acid with a polar side chain. Identify the chiral centers in threonine. How many optical isomers does threonine have?
Answers
D-, L-, and D-allo-threonine isomers of threonine have no nutritional or other advantages. More often than natural proteins, Thr is utilised to synthesise Thr.
What are the chiral centers of threonine?Chiral centres are those to which four distinct atom groups are bound. Carbon a cannot be a chiral carbon since it has three hydrogen atoms connected to it. Since it is doubly linked to oxygen, it is not the carboxyl carbon either. Furthermore, because it is bound to three rather than four separate groups of atoms, the amino nitrogen is ineligible in any case.
Due to the two chiral centres in threonine, there are four potential stereoisomers. Other than being rare in nature, the isomers of threonine (D-, L-, and D-allo-threonine) have no nutritional or other benefit. Nowadays, synthetic Thr is used more frequently than natural proteins to make Thr.
The chiral centres of amino acids can be one or many. Except for glycine, the a-carbon is chiral in all amino acids. There are extra chiral centres in some amino acids. Because there are four distinct groups connected to the carbon atom, these are chiral centres.
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5. How many moles are there in 222.3 grams of Ca(OH)2? (1) 1.5 mol (3) 5.5 mol (2) 3.0 mol (4) 22.3 mol 5
Answers
Answer: (2)3.0 mol
Explanation: 222.3g= 222.3/74= 3.0 mol
1mol Ca(OH)2 is 74g
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 3.0 moles are there in 222.3 grams of Ca(OH)\(_2\). The correct option is option 3.
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity or amount of substance. We know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number. The stoichiometry represents the number of moles.
Mathematically,
number of moles of Ca(OH)\(_2\) =given mass of Ca(OH)\(_2\)÷ molar mass of Ca(OH)\(_2\)
Molar mass of 1 mole of Ca(OH)\(_2\)= 74 g/mol
mass of NaOH= 222.3g
Substituting all the given values in the above equation, we get
number of moles of Ca(OH)\(_2\) = 222.3/74
number of moles of Ca(OH)\(_2\) =3.0 moles
Therefore, 3.0 moles are there in 222.3 grams of Ca(OH)\(_2\). The correct option is option 3.
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Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to .
Answers
Answer:
The indroduction of lizards in this marshy habitat may lead to severe alterations of its own ecosystem. Since the lizards and frogs are both species who feed on small insects, the insect population might begin to decrease around the area. Furthermore, if insects have lessened in the marsh, that means food for the lizard as well as for the frog. In an extreme scenario, unless the two species adapt to these new conditions, their population may rapidly decrease.
Answer:
Small frogs living in a marshy region feed on small insects in the region. The relationship between the frogs and insects is a commensal-host relationship. A particular species of lizards is introduced into the marshy land. These lizards also start feeding on these insects. The introduction of lizards may lead to competition between lizards and frogs for food .
What is the relationship between the kinetic energy of molecules in a solid and a liquid? Justify your response in two or more complete sentences.
will give brainliest
Answers
Answer:
Gases have more kinetic energy than liquids
Explanation:
Gases have more kinetic energy than liquids. Liquids have more kinetic energy than solids. When a substance increases in temperature, heat is being added, and its particles are gaining kinetic energy. Because of their close proximity to one another, liquid and solid particles experience intermolecular forces.
hope this helps
Consider the reaction
N2 + 3 H2 → 2 NH3 .
How much NH3 can be produced from the reaction of 74.2 g of N2 and 14.0 moles of H2?
Answers
The mass of ammonia that can be produced from the reaction of 74.2 g of N₂ and 14.0 moles of H₂ is 90.1 g.
What is the mole ratio of the reaction for the production of ammonia?The mole ratio of the reaction for the production of ammonia is obtained from the balanced equation of the reaction as follows:
Equation of the reaction: N₂ (g) + 3 H₂ (g) → 2 NH₃ (g)
The mole ratio of the reactants nitrogen and hydrogen is 1 : 3
Moles of nitrogen in 74.2 g of nitrogen = 74.2/28
Moles of nitrogen in 74.2 g of nitrogen = 2.65 moles
Moles of hydrogen present = 14.0 moles
The limiting reactant is nitrogen
Mole ratio of nitrogen to ammonia is 1 : 2
Mass of ammonia produced = 2.65 * 2 * 17 g
Mass of ammonia produced = 90.1 g
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