How many formula units are there in 4.80x10^-3 mol of NaI?

Answer: 0.25 atm

Explanation:

6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.

The concentration of hydroxide ions (OH-) is measured by pOH. It can be employed to express a solution's alkalinity.

Aqueous solutions containing pOH less than 7 at 25 degrees Celsius are alkaline, pOH larger than 7 are acidic, as well as pOH equal to 7 constitute neutral.

pOH = -log[ OH ]

pOH = -log[ 5.8 x 10⁻⁹ ]

        = 5.84

Therefore, 6.84 is the pOH of a solution that has a [OH⁻] value 5.8 x 10⁻⁹. The correct option is option B among all the given options.

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If we decrease the temperature to 200 K at constant pressure, 13.3 L  would the new volume .

What is temperature?

Temperature is a unit used to represent how hot or cold something is. It can be stated using the Celsius or Fahrenheit scales, among others. Temperature shows which way heat energy will naturally flow, i.e., from a hotter (body with a higher temperature) to a colder (body with a lower temperature) (one at a lower temperature).

What is pressure?

As force applied per unit area, pressure is defined. P=FA, where F is the force operating perpendicular to the surface area A, gives it mathematical expression. The pascal (Pa), which equates to a newton per square metre (N/m 2), is the accepted unit of pressure.

Therefore, If we decrease the temperature to 200 K at constant pressure, 13.3 L  would the new volume .

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A) To calculate the total bond energy, we need to know the bonds broken and formed in the reaction. In this case, the reactants are C₂H₄ and H₂, and the product is C₂H₆.

Reactants:

C₂H₄ has one C=C bond and four C-H bonds. Total bond energy

= (1 x 614 kJ/mol) + (4 x 413 kJ/mol) = 2462 kJ/mol

H2 has one H-H bond. Total bond energy

= 1 x 436 kJ/mol = 436 kJ/mol

Products:

C₂H₆ has six C-H bonds and one C-C bond.

Total bond energy

= (6 x 413 kJ/mol) + (1 x 348 kJ/mol) = 2862 kJ/mol

Total energy = reactant energy - product energy = (2462 kJ/mol + 436 kJ/mol) - 2862 kJ/mol = 36 kJ/mol

Therefore, the total bond energy for the reaction is 36 kJ/mol.

B) The reaction is exothermic because the total energy is negative (-36 kJ/mol). This means that energy is released when the reaction occurs.

C) The formation of C-C bond releases energy (348 kJ/mol), and the breaking of C=C bond requires energy input (614 kJ/mol). The formation of four C-H bonds releases energy (4 x 413 kJ/mol = 1652 kJ/mol), and the formation of two additional C-H bonds releases more energy (2 x 413 kJ/mol = 826 kJ/mol). The breaking of one H-H bond requires energy input (436 kJ/mol).

The total energy released by the formation of new bonds is greater than the energy required to break the old bonds, resulting in an exothermic reaction.

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The ion AT3 has a total of 22 valence electrons: 5 from A and 6 from T, multiplied by 3 since there are three T atoms.

Generally,  To determine the number of coordinate covalent bonds, we need to draw the Lewis structure and check the formal charges.

If A donates three electrons to each T atom, it will have a formal charge of +2 (5 valence electrons - 3 donated electrons - 0 non-bonding electrons). Each T atom will have a formal charge of -1 (6 valence electrons - 3 donated electrons - 2 non-bonding electrons).

The Lewis structure for AT3 will have single bonds between A and each T atom, and each T atom will have a lone pair of electrons.

The total number of electrons used in the bonds is 6 (2 from each bond). The remaining 16 electrons will be distributed among the three T atoms as lone pairs.

Therefore, there are no coordinate covalent bonds in the ion AT3.

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Answer:

Carbon dioxide

Explanation:

Carbon dioxide gas is used by plants for the preparation of food materials. During this food preparation process, plants take up carbon dioxide from the air and give up oxygen.

The right response is "Negative, since pressure reduces as fluid velocity rises." The best choice is B.

As a vehicle goes quickly, it creates a low pressure region, which causes dust to be pushed along in it. As a swift train passes by us while we are in the platform, we are drawn toward the rail due to the low pressure created by the train's extreme speed.

According to Bernoulli's principle, an item experiences various pressures as air travels about it. Less pressure results from faster air. More pressure results from slower air.

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The Complete Question :

According to Bernoulli's Principle, what type of relationship do fluid velocity and pressure share?

A. Positive, because as the velocity of a fluid increases, so does the pressure.

B. Negative, because as the velocity of a fluid increases the pressure decreases.

C. Neutral, because velocity and pressure do not correlate in fluids.

Answer:

4.20 atm

Explanation:

PV = nRT

convert the temperature from Celsius to Kelvin:

T(K) = T(C) + 273.15

T(K) = 17 + 273.15

T(K) = 290.15 K

plug in the values:

n = 0.4 moles

V = 7.0 L

R = 0.08206 L atm / (mol K) (Gas constant)

T = 290.15 K

PV = nRT

P = nRT / V

P = (0.4 moles) x (0.08206 L atm / (mol K)) x (290.15 K) / (7.0 L)

P = 4.20 atm (rounded to two significant figures)

Therefore, the pressure of the gas is 4.20 atm.

Science could be used either for good or for bad depending on the user. This can be observed from the life of Fritz Haber described below.

Fritz Haber was a German chemist who made significant contributions to the fields of chemistry and agriculture, and he is known for developing the process of synthesizing ammonia, which is used in fertilizer production. However, he is also known for his involvement in the development and use of chemical weapons during World War I.

Overall, it is difficult to make a definitive statement about whether the world is better off with or without Fritz Haber. His contributions to science and agriculture have been important, but the development and use of chemical weapons are atrocities that cannot be ignored. It is important to acknowledge and learn from both aspects of his legacy.

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Answer:0.146 torr

Explanation:

Yes to the gas constant

you use 0.0821 L.atm/mol.k  If you want pressure in atm

use 62.44 L.torr/ mol.k  if you want pressure in torr

n=PV/RT

n= 722.4 X 3.79/(62.44 X 300) =

The solubility of PbCl2 in water (H2O) at 20.0 °C (temperature) is 10.407 g/L.

First, we need to calculate how much PbCl2 actually dissolved in the water. The amount of PbCl2 that did dissolve is the difference between the initial amount of PbCl2 added and the amount of PbCl2 that remained after filtering:

Initial amount of PbCl2 = 239.7 mg

Amount of PbCl2 remaining after filtering = 83.6 mg

Amount of PbCl2 that dissolved = 239.7 mg - 83.6 mg = 156.1 mg

Next, we can use the density of water at 20.0 °C, which is 0.9982 g/mL, to calculate the volume of the solution:

Volume of solution = 15.0 mL = 0.015 L

Finally, we can calculate the solubility of PbCl2 in g/L:

Solubility of PbCl2 = amount of PbCl2 that dissolved / volume of solution

Solubility of PbCl2 = 156.1 mg / 0.015 L

Solubility of PbCl2 = 10406.7 mg/L

Solubility of PbCl2 = 10.407 g/L

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Answer:The answer is physical change.

Explanation: The reason for this is because when popcorn is in its original state/form it is inside of a tear like shell and then when it changes it is an odd shaped peice if popped corn. Simple way to know is its physicle apperance changes.

There is a different way to contribute to the CO₂ budget balance besides reducing or turning off this carbon, which would help reduce the amount of greenhouse gases in the atmosphere. However, that depends on the precise amount of carbon that the oceans, trees, and plants are absorbing.

The carbon sinks in the cycle have so far had plenty of extra capacity. In fact, since we began burning fossil fuels for energy after the Industrial revolution, about half of the carbon dioxide emissions released into the atmosphere have naturally cycled away again.

A quarter of this carbon dioxide dissolves in water, so the oceans have absorbed it. As they used sunlight to turn it into glucose and oxygen during photosynthesis, plants use up an additional quarter.

The airborne carbon that was captured now exists as trees or is buried in peat, grassland, and soils. It is submerged in the water, dissolving in the deep ocean, or drifting as sediment on the seafloor. In other words, the planet has improved.

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A balanced equation obey the law of conservation of mass. According to law of conservation of mass, mass can neither be created nor be destroyed.

A balanced chemical equation is an equation in which the number of atoms of reactants and products on both sides of the equation are balanced. The coefficients are the numbers which are used to balance the chemical equation.

The decomposition of potassium chlorate is:

2KClO₃ (s) + heat → 2KCl (s) + 3O₂ (g)

Here the number of 'K', 'Cl' and 'O' atoms are equal on both sides of the equation.

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a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

The limiting reactant or limiting reagent is a reactant in a chemical reaction that determines the amount of product that is formed.

Identification of the limiting reactant can help calculate the theoretical yield of a reaction.

Given the reaction,

2Al₂S₃ + 6 H₂O = 2Al(OH)₃ + 3H₂S

Mass of aluminium sulfide = 316g

Mass of water = 493 g

Moles = Mass ÷ molar mass

Moles of Aluminium sulfide = 316 ÷ 150

=  2.10 moles

Moles of water = 493 ÷ 18

= 27.3 moles

Since moles of aluminium sulfide is less, it is the limiting reagent.

From the reaction, 2 moles of aluminium sulfide gives 3 moles of H₂S.

1 moles of Al₂S₃ will give 3 ÷ 2 moles of H₂S.

Thus, 2.1 moles of Al₂S₃ will give 1.5 × 2.1 moles

                                 = 3.15 moles of H₂S

Mass of H₂S = Moles × molar mass

                                  = 3.15 × 34 = 107.1 g

From the reaction, 2 moles of aluminium sulfide gives 6 moles of H₂O.

1 mole will need 3 moles of water.

Thus, 2.1 moles will need 3 × 2.1 moles = 6.3 moles of water

Excess of water = 27.3 - 6.3 = 21 moles

Mass of excess reactant = 21 × 18 = 378g

Actual yield of  H₂S = 203g

Theoretical yield = 107.1 g

% yield = (107.1 × 100) ÷ 203 = 52.75 %

Therefore,

a) 107.1 g of hydrosulfric acid can be formed.

b) Aluminium sulfide is the limiting reactant.

c) 378g of excess reactant remains.

d) 52.75 % is the percent yield.

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Answer:

the water is being observed a bi paper towel material through a process called capillary action capital reaction on Sonu's capability is a rising or absorption

Answer: The water spreads out and covers a larger area on the paper towel.

It is believed that tectonic plates move as a result of convection in the asthenosphere and gravity.

According to the widely recognized scientific hypothesis known as plate tectonics, the Earth's lithosphere is made up of many sizable tectonic plates that have been steadily moving for nearly 3.4 billion years.

A tectonic plate, also known as a lithospheric plate, is a sizable slab of solid rock with an uneven shape that is typically made up of both continental and oceanic lithosphere. The Pacific and Antarctic Plates are among the largest plates, but they can range in size from a few hundred to thousands of kilometers broad.

Thus, it follows that convection in the asthenosphere and gravity are thought to be the causes of tectonic plate movement.

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Explanation:

Refer to pic............

The mass of baking soda required for a reaction is measured in grammes.

The metric system uses the gramme and kilogramme as its two primary units for measuring mass. Using the common metric prefixes, we can derive the remaining metric units from the gramme. A paper clip weighs roughly one gramme.

Using balancing scales is one method of determining an object's mass. Place the item you want to weigh on one side of a balance scale, then add gramme masses to the opposite side until the scales are level. Typically, masses for weighing come in 1 g and 5 g units.

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Answer:

The quantity of nitrogen the cylinder contains is 4477.8 g

Explanation:

hope this helps u out:))

Answer:

Assuming ideal gas behavior, we can use the ideal gas law:

PV = nRT

where P is the pressure, V is the volume, n is the number of moles, R is the gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin:

T = 313 ºK

The gas constant R is 8.31 J/(mol·K), but we need to use a value in units of kPa·L/(mol·K) for the pressure and volume units given:

R = 8.31 kPa·L/(mol·K)

Plugging in the given values, we have:

P × 20.0 L = 10.0 mol × 8.31 kPa·L/(mol·K) × 313 K

Solving for P, we get:

P = (10.0 mol × 8.31 kPa·L/(mol·K) × 313 K) / 20.0 L

P = 1293 kPa

Therefore, the final pressure in the cylinder is 1293 kPa.

Based on the given information, we can plot the data points on the blank graph to see the effect of speed on kinetic energy:

Vertical axis: Kinetic Energy (Joules)

Horizontal axis: Speed (meters per second)

Define the term kinetic energy.

The energy an object has as a result of its motion is known as kinetic energy. It is a scalar quantity and is defined as one-half of the product of an object's mass and the square of its velocity. Mathematically, it can be represented as:

        Kinetic Energy = 1/2 x mass x [tex]velocity^{2}[/tex]

where mass is the mass of the object in kilograms and velocity is the speed of the object in meters per second.

Kinetic energy is a form of mechanical energy and can be transferred between objects in collisions or other interactions. It is a fundamental concept in physics and is used to understand and describe the behavior of moving objects in various physical systems.

The data points are:

Trial 1: Mass=2, Speed=1, Kinetic Energy=1

Trial 2: Mass=2, Speed=2, Kinetic Energy=4

Trial 3: Mass=2, Speed=3, Kinetic Energy=9

Trial 4: Mass=2, Speed=4, Kinetic Energy=16

Therefore, The graph shows that as the speed increases, the kinetic energy also increases. The relationship between speed and kinetic energy is quadratic, which means that the kinetic energy increases with the square of the speed.

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From the table, it is very clear that as the crystallinity increases, its stiffness also increasing. The FCC structures are having less crystallinity and is more ductile than BCC structure.

Ductility of a material is the ability to make very thin elongated wires. Whereas, stiffness of a material is the resistance to any elongation or compression.

The more crystalline the material, more will be the stiffens. The material with higher Young's modulus  (Y) are more crystalline and stiff. As Y decreases, stiffness decreases, the material becomes ductile.

Because the body-centered cubic (BCC) lattice is not tightly packed despite being cubic, the face-centered cubic (FCC) crystalline structure has greater ductility than the BCC.

Due to the fact that a hexagonal close-packed (HCP) lattice is densely packed but not cubic, HCP metals are less ductile than BCC and FCC metals.

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If 4 moles of oxygen are produced, 2.66 moles of potassium chloride are produced in the given laboratory preparation.

What is mole concept?

Avogadro's number is the number of units in one mole of any substance and equals to 6.02214076 × 10²³. The units can be electrons, atoms, ions, or molecules.

No. of moles is defined as a particular no. of particles that we can calculate with the help of Avogadro’s number.

Given,

laboratory preparation for oxygen gas:

2KClO₃ (s) —------> 2KCl (s) + 3O₂ (g)

Moles of oxygen = 4 moles

When 3 moles of oxygen are produced 2 moles of potassium chloride are produced.

When 1 mole of oxygen are produced 2/3 moles of potassium chloride are produced.

Hence, 4 moles of oxygen are produced (2÷3)×4 = 2.66 moles of potassium chloride are produced.

Therefore, if 4 moles of oxygen are produced, 2.66 moles of potassium chloride are produced in the given laboratory preparation.

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The lattice structure of a molecular solid Ionic compound are mentioned below.

What is lattice structure?

An asymmetrical three-dimensional structural arrangement of ions, atoms, and molecules to create a unit cell is called a lattice or a crystal lattice. The kind of crystal lattice is determined by a unit cell's substantial and distinctive geometrical shape. Every ion, atom, or molecule in a crystal structure's unit cell represents a point in a three-dimensional space.

What is ionic compound ?

An ion with a positive charge is a cation, whereas one with a negative charge is an anion.

Therefore, The lattice structure of a molecular solid Ionic compound are mentioned above.

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Answer:

percentage composition = 13.2%

Explanation:

percentage of magnesium in magnesium bromide can be found by molar mass of magnesium over molar mass of magnesium bromide.

Molar mass of elements can be found using a standard IUPAC Periodic Table.

M(Mg) = 24.31 g/mol

M(MgBr₂) = 24.31 + 79.90×2 = 184.11 g/mol

∴ percentage composition = 13.2%

According to the solving 0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.

A chemical reaction is an event in which reactants chemically reacts and transform into products chemically. As an illustration, during respiration, oxygen is inhaled and combines with glucose to create carbon dioxide, water, and energy.

K₂CrO₄ + 2 AgNO₃ → 2 KNO₃ + Ag₂CrO₄

the moles of AgNO3 used in the reaction with K2CrO4 is:

n(AgNO3) = (14.6 mL) (0.1 mol/L)

= 1.46 × 10⁻³ mol

Since the same amount of AgNO3 is used in the reaction with NaCl, we can calculate the moles of NaCl needed to react completely with 35.2 mL of 0.1 M AgNO3:

n(NaCl) = n(AgNO3) / 2

= (1.46 × 10⁻³ mol) / 2

= 7.3 × 10⁻³ mol

To calculate the mass of NaCl needed, we can use its molar mass:

M(NaCl) = 58.44 g/mol

Mass of NaCl needed = n(NaCl) x M(NaCl)

= (7.3 × 10⁻⁴ mol) x (58.44 g/mol)

= 0.0427 g

0.0427 g of NaCl is needed to react completely with 35.2 mL of 0.1 M AgNO3.

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1.25 x 1023 atoms of magnesium contains 0.28. moles of magnesium.

A mole of any element contains Avogadro's number of that element's atoms. To find the number of moles of magnesium in 1.25 x 1023 atoms of magnesium, simply divide by Avogadro's number:

1.25 x

[tex] {10}^{23} [/tex]

magnesium atoms / 6.022 x

[tex] {10}^{23} [/tex]

atoms/mol = 0.208 moles magnesium

As a result, 1.25 x

[tex] {10}^{23} [/tex]

atoms of magnesium contain 0.208 moles of magnesium.

The number of particles (atoms, molecules, and ions) in one mole of a substance is represented by Avogadro's number, which is a fundamental constant in chemistry. It has a value of about 6.022 x

[tex] {10}^{23} [/tex]

particles per mole. The number was named after Italian scientist Amedeo Avogadro, who first proposed the concept in the early 19th century as a way to explain the relationship between the amount of a substance and its constituent particles.

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The balanced chemical equation for the given reaction is: 2IrCl3(aq) + 3NaOH(aq) → Ir2O3(s) + 3HCl(aq) + 3NaCl(aq)

Use the atomic masses to translate each element's mass into moles. By dividing the total number of moles by the smallest number of moles, you may determine the ratio or the number of moles of each element.

The mole ratio of the reactants and products are represented by the coefficients in a balanced chemical equation. Hence, the total mole ratio for the indicated reaction is:

2 moles of IrCl3 : 3 moles of NaOH : 1 mole of Ir2O3 : 3 moles of HCl : 3 moles of NaCl

This can also be expressed in simpler terms as:

2:3:1:3:3

As a result, 3 moles of NaOH are needed to completely react with every 2 moles of IrCl3. 3 moles of HCl, 3 moles of NaCl, and 1 mole of Ir2O3 are the end products.

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Due to the gravitational force the moon orbit earth in the same direction that earth orbits the sun.

What is gravitational force ?

Newton's Law of Gravitation and the force of gravity. The force of attraction between any two bodies is known as gravity, or simply gravity. All objects in the cosmos are attracted to one another with some force, but most of the time this attraction is too faint to be noticed due to the extreme distance between the objects.

Distance is an object's overall movement, regardless of direction. Distance refers to the length of an object's real route as a whole. The displacement of an object between two points is defined as the straight line distance (shortest distance), measured from one position to the other.

Therefore, Due to the gravitational force the moon orbit earth in the same direction that earth orbits the sun.

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