How many moles of hydrogen will form if 3.0 mole of potassium metal reacts completely with hydrochloric acid?

The total number of atoms in 3.75 mol of ammonium nitrate, NH4NO3, is equal to the Avogadro's number, which is 6.022 x 10^23, times the number of moles, which is 3.75 in this case.

Thus, the total number of atoms in 3.75 mol of ammonium nitrate is equal to 2.26 x 10^24 atoms.

This number can be further broken down into the number of atoms of each element present in the compound. Ammonium nitrate is composed of two elements, nitrogen (N) and hydrogen (H). For each mole of ammonium nitrate, there are 4 moles of hydrogen atoms and 2 moles of nitrogen atoms.

Therefore, in 3.75 moles of ammonium nitrate, there are 15 moles of hydrogen atoms and 7.5 moles of nitrogen atoms, which is equal to 9 x 10^24 hydrogen atoms and 4.05 x 10^24 nitrogen atoms.

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The enthalpy change for the following reaction:

CH4 + 2O2 = CO2 + 2H2O is (-890) kJ/mol and it is exothermic

The bond enthalpy values for the reactants and products can be used to calculate the enthalpy change for the following reaction:

CH4 + 2O2 = CO2 + 2H2O

The bond enthalpies for the individual bonds in each molecule are:

CH4: C-H bond enthalpy = 413 kJ/mol

H-H bond enthalpy = 436 kJ/mol

O2: O=O bond enthalpy = 498 kJ/mol

CO2: C=O bond enthalpy = 799 kJ/mol

H2O: H-O bond enthalpy = 463 kJ/mol

To calculate the overall enthalpy change for the reaction, we need to add up the bond enthalpies for the reactants and subtract the bond enthalpies for the products.

The enthalpy change for the reaction is calculated as follows:

(1*(C-H bond enthalpy + 3H-H bond enthalpy) + 2(O=O bond enthalpy)) - (1*(C=O bond enthalpy) + 2*(2*H-O bond enthalpy))

= (1*(413 + 3436) + 2498) - (1799 + 2(2*463))

= (-890) kJ/mol

So this reaction is exothermic.

Therefore, the correct answer is as given above

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Answer:

C

Explanation:its right

The correct structure that corresponds to the name 2,2,3-trichloro-3-fluorohexane is both. Thus option C is correct.

Chemical structure is defined as the physical configuration of atoms within a molecule. The molecular geometry of the molecule is determined by its chemical structure. By illustrating how the atoms and chemical bonds are arranged in space within the molecule, chemical structure can be used to establish the molecular geometry of a product. Chemists can now see a crucial visual depiction of a chemical formula thanks to this.

2,2,3-trichloro-3-fluorohexane structure given is both are correct as one of the structure is trans form and the other is cis form of the structure. Option A is trans form while option B is cis form of structure.

Thus, the correct structure that corresponds to the name 2,2,3-trichloro-3-fluorohexane is both. Thus option C is correct.

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Answer:

4.98/5 = 0.996 (don't forget to add your units)

Explanation:

Density= Mass/Volume

4.98/5= 0.996 (don't forget to add your units)  

Answer:

Exothermic Reaction

Product  = Calcium hydroxide + hydrogen

Explanation:

The atomic weight of silver is 108 and the density is 10.5 gm/cm³ .

What is atomic weight?

Ratio of an element's average atom mass to a reference value. One-twelfth the mass of an atom of the carbon-12 isotope has been the accepted unit of atomic mass since 1961.

What is density?

The property or condition of being dense: the amount of anything per unit of area, volume, or length, such as.: the mass of a substance per unit volume.

Therefore,  the atomic weight of silver is 108 and the density is 10.5 gm/cm³ .

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The theory of plate tectonics explains the location of most earthquakes and volcanoes as on the boundaries of tectonic plates, most of the earthquakes or volcanoes happen.

Plate tectonics is the plates that are present in the earth's crust. These plates are of different types. These plates are always in movement. These plates are divergent, convergent, etc.

Earthquakes, volcanoes, and tectonic plates. The plate tectonics hypothesis states that Earth is a dynamic planet.

The numerous separate plates that make up its surface move and interact with one another, continually modifying and reshaping the Earth's outer layer. Tectonic plate movement causes both earthquakes and volcanoes.

Thus, the ends of the tectonic plates are the places where earthquakes or volcanoes happen.

Answer

7665 years

Procedure

Let N₀ be the amount of carbon-14 present in a living organism. According to the radioactive decay law, the number of carbon-14 atoms, N, left in a dead tissue sample after a certain time, t, is given by the exponential equation:

N = N₀e^(-λt)

where λ is the decay constant which is related to half-life (T1/2) by the equation:

Here, ln(2) is the natural logarithm of 2.

The percent of carbon-14 remaining after time t is given by N/N₀.

Using the first equation, we can determine λt.

The half-life of carbon-14 is 5,720 years, thus, we can calculate λ using the second equation, and then find t.

Solving the second equation for t, and using the λ we have just calculated we will have

t= 7665 years

The modification should be made to improve the validity of the experiment is the students should each have a different teacher. Hence option A is correct.

Experiment is defined as a process used to confirm or deny a hypothesis, as well as assess the likelihood or effectiveness of a previously untested idea. Testing hypotheses and acting as the basis for scientific knowledge are two of its most important roles.

The experiment is perfect but the modification needed is the students must have given different teachers so that the student will understand the concept in different way and the teacher mush have to explain the students in the easiest possible way so that the student will understand it easily.

Thus, the modification should be made to improve the validity of the experiment is the students should each have a different teacher. Hence option A is correct.

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Answer:

The maximum mass of carbon dioxide, CO₂ produced is 2.64 g

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2C₈H₁₈ + 25O₂ —> 16CO₂ + 18H₂O

Next, we shall determine the masses of C₈H₁₈ and O₂ that reacted and the mass of CO₂ produced from the balanced equation. This can be obtained as follow:

Molar mass of C₈H₁₈ = (8×12) + (18×1)

= 96 + 18

= 114 g/mol

Mass of C₈H₁₈ from the balanced equation = 2 × 114 = 228 g

Molar mass of O₂ = 2 × 16 = 32 g/mol

Mass of O₂ from the balanced equation = 25 × 32 = 800 g

Molar mass of CO₂ = 12 + (2×16)

= 12 + 32

= 44 g/mol

Mass of CO₂ from the balanced equation = 16 × 44 = 704 g

SUMMARY:

From the balanced equation above,

228 g of C₈H₁₈ reacted with 800 g of O₂ to produce 704 g of CO₂.

Next, we shall determine the limiting reactant. This can be obtained as follow:

From the balanced equation above,

228 g of C₈H₁₈ reacted with 800 g of O₂.

Therefore, 3.43 g of C₈H₁₈ will react with = (3.43 × 800)/228 = 12.04 of O₂

From the calculations made above, we can see that a higher mass (i.e 12.04 g) of O₂ than what was given (i.e 3 g) is needed to react completely with 3.43 g of C₈H₁₈. Therefore, O₂ is the limiting reactant and C₈H₁₈ is the excess reactant.

Finally, we shall determine the maximum mass of carbon dioxide, CO₂ produced from the reaction.

To obtain the maximum mass of carbon dioxide, CO₂ produced, the limiting reactant will be used because all of it is consumed in the reaction.

The limiting reactant is O₂ and the maximum mass of carbon dioxide, CO₂ produced can be obtained as follow:

From the balanced equation above,

800 g of O₂ reacted to produce 704 g of CO₂.

Therefore, 3 g of O₂ will react to produce = (3 × 704)/800 = 2.64 g of CO₂.

Thus, the maximum mass of carbon dioxide, CO₂ produced is 2.64 g

The manner in which the transfer of energy would be different if the bars were in an open system is as follows: Energy transfer would occur between the copper bars and the surroundings (option B).

The law of conservation of energy principle stating that energy may not be created or destroyed.

An isolated system exchanges neither energy nor matter with the surroundings. According to this question, two copper bars at different temperatures transfer energy until both are at the same temperature.

However, in an open system, some of the energy would be transferred to the surroundings.

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Answer:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

Explanation:

Hello,

In this case, since molarity is mathematically defined as the moles of solute divided by the volume of solution and the weight/weight percent as the mass of solute divided by the mass of solution, we need:

- The molar mass of the solute, in order to convert from moles of solute to grams of solute.

- The density of solution, to convert from volume of solution to mass of solution.

For instance, if a 1-M solution of HCl has a density of 1.125 g/mL, we can compute the w/w% as follows:

\(w/w\%=1\frac{molHCl}{L\ sln}*\frac{36.45gHCl}{1molHCl}*\frac{1L\ sln}{1000mL\ sln}*\frac{1mL\ sln}{1.125g\ sln} *100\%\\\\w/w\%=3.15\%\)

Whereas the first factor corresponds to the molar mass of HCl, the second one the conversion from L to mL of solution and the third one the density to express in terms of grams of solution.

Regards.

For the w/w% of the solution, information about the molecular mass of the solute, and density of the solution has been required.

Molarity can be defined as the moles of the solute per liter of the solution. The molarity can be used for the determination of the weight of the solute, by the information about the molecular weight of the compound.

Thus, for the w/w% of the solution, the weight of the solute has been determined with information about the molecular mass of the solute.

The weight of the solvent has been determined with the density of the solution. The density has been defined as the mass per unit volume.

Thus, for the w/w% of the solution, the weight of the solvent has been determined by the density of the solution.

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Answer:

answer is first one 1 will be less then that of hg coloumn

Answer:

B

Explanation:

Vaccines prevent illness and disease

Answer:

The temperature in degrees Celsius of a 7.00 L tank containing 13.57 g of H2 gas (mM = 2.016 g mol-1) if the tank has a total pressure of 6177 Torr and the H2 gas is behaving ideally is approximately -128.11°C. This temperature is calculated using the ideal gas law equation, which relates temperature, pressure, and the amount of gas in the tank.

Explanation:

First, we need to write the equation balanced:

N2 + 3 H2 --> 2 NH3

If 1 batch contains 175 grams:

1 batch --- 175 grams

70 batches ---- x

x = 12,250 g of ammonia needs to be produced.

Now let's transform 22,000 g of N2 and 1,000 grams of H2 into moles. For this, we use the following formula:

n = m/MM

MM of N2: 28 g/mol

n = 22,000/28

n = 785.7 moles

MM of H2: 2 g/mol

n = 1000/2

n = 500 moles

So it means that H2 is the limiting reactant, because the stoichometry of N2 and H2 is 1:3.

So:

3 moles of H2 --- 2 moles of NH3

500 moles of H2 --- x moles of NH3

x = 333.33 moles of NH3

Now we transform this value into grams:

m = n*MM

MM of NH3 = 17 g/mol

m = 333.33*17

m = 5,666.6 g

With 22,000 g of N2 and 1000 g of H2 it will be produced 5,666.6 g of NH3.

We need to produce 12,250 g of ammonia.

So:

Answer: B. No, the hydrogen will run out first.

Answer:

\(m_{leftover}=37g\)

Explanation:

Hello!

In this case, since the melting process involves the heat added to the system, the heat of fusion and the mass of water:

\(Q=m\Delta H_{fus}\)

Thus, as it has been reported that the heat of fusion of ice is 333.6 J/g, we can compute the melted mass of ice as shown below:

\(m=\frac{Q}{\Delta H_{fus}} =\frac{46000J}{333.6J/g}\\\\m=138g\)

Thus, the ice leftover results:

\(m_{leftover}=175g-138g\\\\m_{leftover}=37g\)

Regards!

Answer

Mass of carbon = 4.069 g

Explanation

Given:

Number of atoms = 2.04x10^23 atoms

Required: Mass of carbon

Solution

Step 1: Find the number of moles of carbon

1 mole = 6.022x10^23 atoms

x moles = 2.04x10^23 atoms

Solve for x

x = (2.04x10^23 atoms x 1 mole)/6.022x10^23 atoms

x = 0.339 mol

Step 2: From the moles, calculate the mass of carbon

m = n x M where m is the mass, n is the moles and M is the molar mass of carbon

m = 0.339 mol x 12,011 g/mol

m = 4.069 g

Answer:

12,579,000

Explanation:

Kilogram (kg) and centigram (cg) are units of mass. It is important to know the value of each when converting from one to the other and vice-versa.

Take note that: 1 kg is equivalent to 100,000 cg

Conversion may be done through the direct proportion method.

Let x be the number of what we're looking for.

Step 1: \(\frac{1 kg}{10,000 cg}\) multiplied by \(\frac{125.79 kg}{x}\) = ?

Step 2: Then, we may cross multiply

            \(\frac{1 kg (x)}{100,000 cg (125.79 kg)}\) = ?

Step 3: \(\frac{x}{12,579,000 cg}\) = ?

Step 4: Therefore, x is equivalent to 12,579,000 cg

In the electrical arrangement, the 6p subshell of the radon element contains 6 electrons.

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The proper result in scientific notation is 7.38 * 10^-1 cm.

We know that the scientific notation is such that the bulk of the numbers or values that we have to deal with is reduced. If not for the use of the scientific notation, we could have a very argue array of values that we would need to deal with in a calculation.

In this case, we have been told to be able to obtain in the correct scientific notation;

1.2 * 10^-2 cm + 2.76 * 10^-3 cm/2 dL

We can write;

1.2 * 10^-2 cm + 0.276 * 10^-2 cm/2 * 10^2 cm

= 7.38 * 10^-1 cm

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The volume of the alloy of gold and silver having density of 13.1 g/cm³ and mass 4.80 g is 0.367 cm³.

We have an alloy of gold and silver.

We have to calculate the volume of a 4.80 g sample of the alloy.

The ratio of mass to density is equal to volume of a substance. Mathematically -

M/ρ = V

ρ - density of substance.

M - mass of substance

V - volume of substance

According to the question -

The ratio of mass to density is -

V = M / ρ

Substitute the values -

V = 4.80 / 13.1 = 0.367 cm³.

Hence, the volume of the alloy of gold and silver is 0.367 cm³.

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Number many peaks are present in the ¹H-nmr spectrum of Eugenol are having 12 different hydrogen atom.

The Eugenol has contain the 12 different hydrogen atoms. in the ¹H-nmr spectrum  the peaks from right to left is 3:2:2:3:2. The three hydrogen atoms have two peaks of about the 6.7 pm. These hydrogen atoms are from the aromatic ring. the four hydrogen atoms have two peaks of around 6 pm.  the one peak is from the hydrogen atom in the OH group. the vinylic hydrogen atoms are 3 they have one peak.

Thus, Number many peaks are present in the ¹H-nmr spectrum of Eugenol are having 12 different hydrogen atom.

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Answer:

Its A

Explanation:

It you look at a wavelength chart, it would show you the rate at which the light travels, from its distance. Which means there has to be two points to calculate it.

The root-mean-square velocity of an oxygen molecule at 55.2 °C is approximately 481.1 m/s.

Root-mean-square velocity is the measure of the speed of gas molecules in a gas sample. It is the square root of the average of the squared velocities of the gas particles in a gas sample.

The root-mean-square velocity of an oxygen molecule can be calculated using the following formula:

v(rms) = √[(3RT)/M]

T = 55.2 °C + 273.15 = 328.35 K

Converting M to kg/mol:

M = 32 g/mol = 0.032 kg/mol

Plugging in the values:

v(rms) = √[(3 x 8.314 J/mol.K x 328.35 K) / 0.032 kg/mol]

v(rms) = 481.1 m/s

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Answer:

it should be B. earths core is composed of iron and nickel, if not let me know.

Answer: B. Earth's core is composed of iron and nickel.

Explanation: The inner core is solid so C and D are incorrect and A is incorrect because the core isn't made of magnets so it has to be B.

Jaws would most likely be written between dot 1 and dot 2 on the branching tree diagram. This is because the derived shared characteristic of jaws would have evolved after the common ancestor and before the perch, frog, pigeon, and other species evolved. Since jaws are not present in the common ancestor, but are present in species such as perch and frog, it is most likely that jaws evolved after the common ancestor and before the perch and frog split from the branching tree.

The mass of titanium that can be obtained from 1.10 kg of the ilmenite-sand mixture is 105.2 g.

To calculate the mass of titanium that can be obtained from 1.10 kg of the ilmenite-sand mixture, we must first determine the mass of ilmenite in the mixture and then use the stoichiometry of the given chemical reactions to calculate the mass of titanium obtained from the ilmenite.Initially, we need to know the mass of the ilmenite in the 1.10 kg ilmenite-sand mixture. This is given as 22.0 % by mass. Therefore, the mass of ilmenite in 1.10 kg of the mixture can be calculated as:Mass of ilmenite = (22.0 / 100) × 1.10 kg = 0.242 kgThe first reaction is FeTiO3(s) + 3Cl2(g) + 3C(s) → 3CO(g) + FeCl2(s) + TiCl4(g)The molar mass of FeTiO3 is 151.7 g/mol, which means that 0.242 kg (or 242 g) of ilmenite corresponds to 1.598 mol. From the balanced chemical equation, 1 mol of FeTiO3 produces 1 mol of TiCl4, so 1.598 mol of FeTiO3 will produce 1.598 mol of TiCl4.Since the first reaction has a yield of 90.5 %, the actual amount of TiCl4 produced is only 90.5 % of the theoretical amount. Therefore, the mass of TiCl4 produced from the given amount of ilmenite is:Mass of TiCl4 produced = (90.5 / 100) × (1.598 mol × 189.7 g/mol) = 246.2 g.

The second reaction is TiCl4(g) + 2Mg(s) → 2MgCl2(l) + Ti(s)The balanced chemical equation shows that 1 mol of TiCl4 reacts with 2 mol of Mg to produce 1 mol of Ti. Therefore, the theoretical amount of titanium produced from 246.2 g of TiCl4 is:Amount of Ti produced = (1 / 2) × 246.2 g = 123.1 gSince the second reaction has a yield of 85.5 %, the actual amount of titanium produced is only 85.5 % of the theoretical amount.Therefore, the mass of titanium that can be obtained from 1.10 kg of the ilmenite-sand mixture is:Mass of Ti obtained = (85.5 / 100) × 123.1 g = 105.2 g.

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Answer:

B.Convection

the movement caused within a fluid by the tendency of hotter and therefore less dense material to rise, and colder, denser material to sink under the influence of gravity, which consequently results in transfer of heat.

Answer:

B.

Explanation:

Answer:

Physical and chemical methods can be used to monitor the rate of a chemical reaction. Physical methods measure changes in properties like temperature, pressure, or volume. Chemical methods track reactant consumption or product formation using techniques like titration or spectrophotometry. The choice of method depends on the reaction being studied, and scientists use these methods to gain insight into reaction kinetics and optimize conditions for better efficiency and selectivity.