Tin (II) fluoride, SnF2, is found in some toothpastes. Tin (II) fluoride is made by reacting solid tin with hydrogen fluoride according to the following BALANCED equation. Sn (s) + 2 HF (g) → SnF2 (s) + H2(g) How many grams of hydrogen gas will be produced if 3.9 moles of tin react?

Answer:

Explanation: Use the ideal gas law formula

PV = nRT

P = pressure (atm)

V = volume (L)

n = moles

R = universe gas constant (.0821)

T = temperature (K)

-- the given temperature is in Celcius to convert it to Kelvin you add 273 to it

plug in the numbers and solve for n

The pH of the solution at the given condition will be 7.5 .

Since the solution is at 25°C which is the standard temperature, we can apply the following relation :

pH = 14.00 - pOH

In the given case the pOH of the solution is 6.51, which on substituting in the relation we get

pH = 14.00 - 6.51

pH = 7.49 ≈ 7.5

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The percentage of sodium (Na) in a formula unit of sodium hydrogen carbonate (NaHCO3) is 27.25%. Percent by mass of sodium = (total mass of sodium/ formula weight) * 100

Percent by mass of an element =(Total mass of the element in the formula / weight ) * 100

Step 1 :Formula weight of NaHCO₃

The atomic mass of Na, H,C and O

Formula weight of NaHCO₃ = Na+H+C+3O

Formula weight of NaHCO₃ = 22.9+1.01+12.01+3(16)

Formula weight of NaHCO₃ is 84.01 g

Step 2 :Use percent by mass formula,

Percent by mass of sodium = (total mass of sodium / formula weight) * 100

Percent by mass of sodium = (22.9)/84.01*100

Percent by mass of sodium = 27.25%

Thus, the percentage by mass of sodium in a formula unit of sodium hydrogen carbonate (NaHCO3) is 27.25%.

Molar mass = g/mol, The mass of one atom of carbon-12 the atomic mass of carbon-12 is exactly 12 atomic mass units. The mass of one mole of carbon atom is exactly 12 grams; its molar mass is exactly 12 grams per mole.

The most common way to express solution concentration is molarity (M), which is defined as the amount of solute in moles by the volume of solution in liters: M = moles of solute/liters of solution.

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The given pressure in Denver is 560mmHg and the calculated atmospheric pressure in atm is 0.73 atm.

Due to the atmosphere's greater bulk above those places, the pressure it applies to objects is highest around or below sea level. Since the mass of the atmosphere at a certain altitude reduces as it rises, atmospheric pressure also lowers as altitude rises.

A pressure of 1 atm is equivalent to 760 mmHg. As a result, we can use the following ratio to determine how many atmospheres of pressure equal 560 mmHg:

[tex]1 atm : 760mmHg = x : 560mmHg[/tex]

On solving the above equation, we get:

[tex]x = \frac{1atm.560mmHg}{760mmHg}[/tex]

[tex]x = 0.73 atm[/tex]

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True. Intermolecular forces in liquids and solids are stronger than those in gases. This is because the molecules in liquids and solids are much closer together than those in gases, so the attractive forces between them are stronger.

The stronger the intermolecular forces, the higher the temperature needed to break them and cause the substance to boil or melt.

In the physical world, the behavior of matter is determined by the forces that act on it. Intermolecular forces, the attractions and repulsions between molecules, are one of the fundamental forces that drive the properties of matter. This essay will explore the role of intermolecular forces in liquids and solids and explain how they contribute to the melting and boiling points of substances.

In liquids and solids, the molecules are much closer together than in gases, so the attractive forces between them are stronger. This is due to the fact that in liquids and solids, the molecules are more densely packed, allowing for greater attraction between them. The stronger these intermolecular forces are, the higher the temperature needed to break them apart, resulting in the melting and boiling point of a substance. This can be seen in the phase diagram for water, where the melting point is 0°C and the boiling point is 100°C.

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Answer:

C. Check if the ions of two compounds exchange places.

The every atom in H₂CO molecule has bond angle is 120 °. the bond angle HCH is 116 ° and The bond angle of H₂CO is 122°.

The H₂CO has trigonal planar molecular geometry. the H₂CO has the same electron geometry that is trigonal planar. The every atom atom attached to the central atom has bond angle is  120 °. the central atom is surrounded by three regions of the electron density. according to the VSEPR theory the molecular geometry is trigonal planar. The  H₂CO is the polar molecular. the hybridization is sp².

Thus, the bond angle in  H₂CO is 120 ° and the molecular geometry is trigonal planar.

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A sample of potassium nitride contains 0.900 moles of potassium ions. 2.689 moles of nitride ions do it contain

1 mole is defined as 6.023 x 1023 ions.

Here, there are 5.4 x 1022 ions, or 0.08965 moles (5.4 x 1022/6.023 x 1023).

Calcium: C +1

Nitric acid: N -3

Three potassium's are required to balance out the -3 charge that one nitride possesses since the total charges must cancel out.

K3N

Moles of potassium ion are therefore 3 x 0.08965, or 2.689 moles.,

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Answer: Physical change: H20 (s) → H20 (1)

Chemical change: C6H1206 (s) + 6 02 (g) 6C02 (g) + 6 H20 (1)

Explanation:

Brianne feels shocked and sad when she sees the wreckage in far rockaway.

This is referred to as a subjective point of view which is used to depict specific sensations based on different factors and circumstances. Examples of feelings include shock, excitement etc which denotes the state of mind of the individual.

In the incidence of a hurricane, she paid attention to the extent of the damaged situation. She watched the news and was in total shock as it narrated the destruction of places she loved and went to for various reasons which is therefore how she felts when she saw the wreckage.

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Answer: Our body needs water to transfer blood through the body.

Explanation: Our heart needs water to help pump blood through the whole body. Outside of transferring blood, we need water for a lot of other things like helping keep our body temperature and more!

The answer is that our bodies needs water to transfer blood through the body.

Answer:

Explanation:

(a) When an additional 1.80 mol of argon gas is added to the container, the total number of moles of gas increases to 1.80 + 1.80 = 3.60 moles. Since the pressure and temperature of the gas remain constant, the volume of the gas will also remain constant at 10.00 L. So the new volume of the gas will be 10.00 L.

(b) When 25.0 g of argon gas is added to the container, we need to convert the mass of the gas to moles to determine its effect on the volume. We can use the ideal gas law to do this:

PV = nRT

Where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature.

Since the pressure and temperature remain constant, we can rearrange the equation to solve for n:

n = PV/RT

Plugging in the values, we get:

n = (1.00 atm)(25.0 g)/(0.08206 Latm/molK)(298 K)

This gives us a value of n = 0.34 mol.

Now that we know the number of moles of gas, we can use the ideal gas law again to solve for the new volume of the gas:

V = nRT/P

Plugging in the values, we get:

V = (0.34 mol)(0.08206 Latm/molK)(298 K)/(1.00 atm)

This gives us a new volume of V = 13.5 L.

(c) When half of the gas escapes from the container, the total number of moles of gas decreases to 1.80/2 = 0.90 mol. Again, we can use the ideal gas law to solve for the new volume of the gas:

V = nRT/P

Plugging in the values, we get:

V = (0.90 mol)(0.08206 Latm/molK)(298 K)/(1.00 atm)

This gives us a new volume of V = 7.50 L.

I hope this helps! Let me know if you have any questions

Answer:

Hi, I'm here to help you. If you have any further question let me know

Explanation:

(a) An additional 1.80 mol of argon gas is added to the container.

The new volume of the gas would be 20.0 L.

(b) A sample of 25.0 g of argon gas is added to the container.

To determine the new volume of the gas, we need to first determine how many moles of argon gas are present in the 25.0 g sample. To do this, we can use the molar mass of argon, which is 39.948 g/mol. This gives us a total of 0.625 moles of argon in the 25.0 g sample. Since the pressure and temperature are constant, the volume of the gas will increase in proportion to the number of moles of gas present. Since 0.625 moles of gas is being added to 1.80 moles of gas, the total number of moles of gas will be 2.425 moles. The new volume of the gas will be 10.00 L * (2.425 moles / 1.80 moles) = 13.5 L.

(c) A hole in the container allows half of the gas to escape.

The new volume of the gas would be 10.00 L / 2 = 5.00 L.

A pure copper sphere has a radius 0.930 in, 47.68 x 10²³ copper atoms does it contain.

The Avogadro number, often known as the Avogadro constant, is the quantity of units contained in one mole of any material. It equals 6.022140857 ×10²³. Depending on the nature of the reaction and the material, the units might be electrons, ions, atoms, or molecules.

Given that,

density = 8.96g/cm³

radius of sphere (r) = 0.935 in

                               = 0.935 x 2.54 cm

                               = 2.3749 cm

Thus, volume of copper sphere,

V = 4/3 π r³

V =  4/3 π (2.3749 cm)³

V = 56.108 cm³

From the volume and given density, calculate the mass of the copper sphere:

As we know, mass = density x volume          

or, mass = 8.96 x 56.108

or, mass = 502.73 g

Now, 1 mole of copper = 63.5 g of copper = 6.022 x 10²³ copper atoms.

502.73 g of copper = (502.73 × 6.022 × 10 ²³)÷ 63.5

                                 = 47.68 x 10²³ copper atoms

Therefore, the copper sphere contains 47.68 x 10²³ copper atoms.

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The properties of the shells that are closer to the nucleus are they have less energy. Therefore, option C is correct.

In order to accomplish work and to produce heat and light, energy must be transferred to a body or to a physical system. Energy is the quantitative attribute that does this.

The 1n shell, which is the one nearest to the nucleus, may accommodate two electrons, while the 2n and 3n shells can accommodate eight and eighteen electrons, respectively. The reactivity of an atom—or propensity to establish chemical interactions with other atoms—depends on the amount of electrons in its outermost shell.

The position of an electron in relation to an atom's nucleus can be used to calculate its energy. The energy level decreases as the electrons get nearer to the nucleus.

Thus, option C is correct.

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The heat needed to convert 40.0 grams of CH₃OH (s) at -97.53˚C to CH₃OH (l) at -43˚C is equal to 5278.5 J.

The specific heat capacity can be defined as the heat required to raise the temperature of one unit of mass by one degree Celsius. The specific heat capacity depends upon the type of material.

The mathematical form is used to calculate the specific heat is equal to:

Q = mCΔT

Given, the mass of the methanol, m = 40 g

The final temperature of the methanol, T₂ = -43°C

The change in temperature of methanol, ΔT = -43 + 97.53 = 54.53°C

The specific heat capacity of methanol, C =  2.5 J/g·°C

The heat required to change methanol temperature:

Q = 40 × 2.42 × 54.53

Q = 5278.5 J

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Answer:

0.83 moles

Explanation:

To find the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water, we can use the mole ratio from the balanced chemical equation. The mole ratio is the ratio of the number of moles of each reactant and product in the chemical reaction.

In the given reaction, the mole ratio of NO2 to NO is 3:1. This means that for every 3 moles of NO2, 1 mole of NO is formed. Therefore, if we have 2.50 moles of NO2, the number of moles of NO that are formed will be 1/3 of that amount, which is 2.50 moles / 3 = 0.83 moles.

Therefore, the number of moles of NO that are formed from 2.50 moles of NO2 in the presence of plenty of water is 0.83 moles.

Answer:The higher something is before it falls, the longer gravity can act on an object.

Explanation:

When something is dropped from higher up it has more time to fall thus giving gravity more time to act on the object.

Take a look at this link for more information.

http://faculty.ric.edu/psci103/newton/newton_notes.pdf

The expression for the pressure of an ideal gas by means of kinetic theory is P = J / V.

According to the kinetic theory, a gas is made up of numerous submicroscopic particles (atoms or molecules), all of which are moving randomly and continuously. The container's walls and the quickly moving particles constantly collide in this situation.

It should be noted that based on the information, the formula illustrated will be:

f² = u²+ v² + w²

p = mv

where P = momentum

m = mass

v = velocity

Time = Distance / Speed

Force = mass × velocity² / distance

Pressure = force / area

J = mn

P = J/V

where

J = total mass

V = total volume

p = density of gas.

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The equation of line of best fit is y = -0.8x + 29.25 and the time spent doing homework for a student who spends 15 hours watching TV is 17.25 hours.

The line of best fit is a mathematical concept that correlates points scattered across a graph. It is a form of linear regression that uses scatter data to determine the best way of defining the relationship between the dots. In order to determine the line of best fit, draw the approximate line between the given points using graphing tools and determine the slope and y intercept. Choose two points (15,15) and (10, 19). Hence, the slope is:

Slope = Rise / Run = (15 – 19)/(15 – 10) = - 0.8

y intercept = 29.25

a) The equation of the lines of best fit is: y = -0.8x + 29.25.

b) when x = 15 hrs

y = -0.8(15) + 29.25

y = 17.25 hours

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Planarity of the peptide bond means that no rotation occurs about the C(O)-N bond while rotation is allowed about the C-alpha-C(O) and N-C-alpha bonds.

Because it has a partial double bond property, the peptide bond is a stable covalent bond and is referred to as a stiff planar bond. The length of the bond is the primary piece of evidence supporting this partial double bond feature.

Rotation cannot occur because of the partial double bond character of the peptide bond. The conformations of the peptide backbone are constrained by this lack of rotation, which also reduces the range of potential configurations.

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Answer:

2.72 x 10^23 particles

Explanation:

1 mol of CU2SO4 has 6.022 x 10^23 particles

so 0.451 mol will have 0.451 x (6.022 x 10^23) = 2.72 x 10^23 particles

The formula for conjugate base is C₆H₅NH₂ and C6H5NH3+ is the conjugate acid.

Conjugate base is defined as when an acid loses a hydrogen ion, a compound is produced. When a proton is added to a base, a conjugate acid is created, and vice versa when a proton is taken away from an acid, a conjugate base is created.

Conjugate acid is defined as a chemical molecule created when an acid gives a base a proton (H). A conjugate acid-base pair is made up of two bases that only differ by the presence or absence of a proton.

Thus, the formula for conjugate base is C₆H₅NH₂ and C6H5NH3+ is the conjugate acid.

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LiAlH4 reagent can reduce aldehydes to primary alcohols, ketones to secondary alcohols, carboxylic acids and esters to primary alcohols, amides and nitriles to amines, epoxides to alcohols and lactones to diols.

LiAlH4 is a powerful reducing agent compared to sodium borohydride, NaBH4, since the Al-H bond is weaker and thus less stable than B-H bond.

Reduction of aldehydes or ketone to primary  and secondary alcohols:

Initially, a hydride ion is transferred onto the carbonyl carbon and the oxygen atom coordinates to the remaining aluminum hydride species to furnish an alkoxy tri hydro aluminate ion, which can reduce the next carbonyl molecule. Thus three of the hydride ions are used up in reduction. The reaction will be as follows :

    AlH4 + ROR   →  RHROH

Reduction of amides to amine:

Amides are converted to amines. The LAH reduction mechanism is slightly different from that depicted for esters. In iminium ion is formed during the reaction since nitrogen atom is relatively a good donor than oxygen atom. The reaction will be as follows:

RONR2 + AlH4 → RNR2

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Sulfur is a chemical element with the atomic number 16 and the symbol S.

The nonmetallic chemical element sulfur (S), also spelled sulfur, is one of the most reactive elements and is a member of the oxygen group (Group 16 of the periodic table). A pale yellow solid with no flavour or odour, pure sulphur is also insoluble in water and has poor electrical conductivity. It is also brittle and tasteless.

The elements sulphur and metal sulphide ores are both found naturally. Near hot springs and volcanoes is where it can be found in its natural state. The tenth most prevalent element, sulfur, is present in nearly all plant and animal life, meteorites, the ocean, the earth's crust, and the atmosphere.

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1700g . To find the molarity of a solution, we divide the number of moles of solute by the total volume of liters of solution.

We know that,

Molarity (mol/litre) = n ( moles of solute)/ Volume of solution

Now, 50 = n / 0.250

Then, n= 12.5 moles.

Now, as we know,

n = given mass/ molar mass

Then, molar mass of zinc chloride. ( ZnCl2) = (65 + 35.5×2) = 65 + 71 = 136 g/mol

12.5 = given mass / 136

Therefore, given mass = 1700 grams.

It's important to keep in mind that M1V1 = M2V2, where M1 is the starting concentration, V1 is the initial volume, M2 is the concentration following mixing or dilution, and V2 is the total final volume. V2 is the total of the volumes blended while working with diluted aqueous solutions.

The number of moles per liter, denoted by the unit symbol mol/L or mol/dm3 in SI units, is the most often used unit denoting molarity in chemistry. One mol/L of a solution's concentration is referred to as one molar, or 1 M.

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The pressure of the gas can be obtained in each case as;

a) 53.1 atm

b) 51.56 atm

We know that an ideal gas is the kind of gas that follows the ideal gas law. We know that we can be able to calculate the pressure of the gas using the Ideal gas equation as well as by the use of the Van Der Walls correction of the equation.

Thus we have;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = Temperature

Then;

P = nRT/V

P = 5.2 * 0.082 * 623/5

P = 53.1 atm

Using the Van Der Walls Correction;

P = nRT/V - nb - a(n/V)^2

P = 5.2 * 0.082 * 623/5 - (5.2 * 0.05105) - 4.250(5.2/5)^2

P = 265.6 /4.73 - 4.597

P = 51.56 atm

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According to percent composition, the percent of mass of zinc  in sample of zinc sulfate is 40.50 %.

Percent composition is defined as a convenient way to record concentration of solution.It is a expression which relates solute to solvent as,mass of solute/mass of solution ×100.There are two types of percentage composition percent weight by volume and percent volume by volume .

In the given example, percent composition of zinc= mass of zinc/mass of zinc sulfate×100

substituting values in above equation,65.38/161.442×100=40.50 %.

Thus, the percent of zinc in zinc sulfate is 40.50 %.

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they have been oxidized; oxidation is therefore the loss of electrons

'

From the information given in Table 5.2, let's determine whether each metal (Cu, Fe, and Zn) was oxidized and identify the oxidizing agent(s) involved.

Cu (Copper):

Was the Metal Oxidized? No, there was no reaction observed for Cu.

Oxidizing Agent(s): No oxidizing agent was involved as there was no reaction.

Fe (Iron):

Was the Metal Oxidized? Yes, Fe was oxidized as there was a reaction observed.

Oxidizing Agent(s): The oxidizing agent involved in the reaction with Fe is not specified in the table.

Zn (Zinc):

Was the Metal Oxidized? Yes, Zn was oxidized as there was a reaction observed.

Oxidizing Agent(s): The oxidizing agent involved in the reaction with Zn is not specified in the table.

It appears that Cu did not undergo any reaction, while both Fe and Zn were oxidized in their respective reactions. However, specific details about the oxidizing agents are not provided in the table.

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To solve such this we must know the concept of redox reaction. Therefore,  the pressure of hydrogen gas formed in mmHg is 661.35mmHg.

Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved. There are so many types of chemical reaction reaction like combination reaction, double displacement reaction.

total pressure= pressure of gas + pressure of water vapor

total pressure= 680.0 mmHg

pressure of water vapor at  21 °C=18.65mmHg

substituting all the given values in the above equation, we get

680.0 = pressure of gas + 18.65

pressure of gas =680- 18.65

                            =661.35mmHg

Therefore,  the pressure of hydrogen gas formed in mmHg is 661.35mmHg.

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246 grams are in 7.84 x 10²² no. particles of Zn(NO₃)₂

A particle is any fundamental piece of matter or energy, according to science. A particle is an amount of stuff that scientists or engineers use to build hypotheses about their field of study. There are no size restrictions when defining a particle.

As we know,

molar mass of zinc (Zn) = 65.38 gm

molar mass of Zn(NO₃)₂ = 189.36 gm

or we can say,

1 mol of Zn(NO₃)₂ contains 189.36 gm of mass.

Also, 1 mol of Zn contains 6.023 × 10²³ no. of particles.

So, 6.023 × 10²³ no. of particles have mass 189.36 gm.

7.84 x 10²²  no. of particles have mass 246 gm.

246 grams are in 7.84 x 10²² no. particles of Zn(NO₃)₂.

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