According to the equation: X--> 208/82 Pb + 4/2 He The nucleus that is 2
correctly represented by X is

Considering the reaction stoichiometry, the correct answer is second option: the total number of moles of water produced from 13. 35 mol of oxygen is 26.7 moles.

The balanced reaction is:

2 H₂ + O₂ → 2 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

Then you can apply the following rule of three: if by stoichiometry 1 moles of O₂ produce 2 moles of H₂O, 13.35 moles of O₂ will produce how many moles of H₂O?

\(amount of moles of H_{2} O=\frac{13.35 moles of O_{2} x2 moles of H_{2} O}{1 mole of O_{2}}\)

amount of moles of H₂O= 26.7 moles

Finally, the correct answer is second option: the total number of moles of water produced from 13. 35 mol of oxygen is 26.7 moles.

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The first step in the preparation of magnesium metal is the precipitation of Mg(OH)₂ from sea water by the addition of Ca(OH)₂ the concentration of Mg₂ (aq) in sea water is 5.37 × 10⁻² m then ph at which [Mg₂ ] is decreased to 1.0 × 10⁻⁵ m is 1.27

Magnesium is the element and also one of the alkaline earth metal and metallic magnesium is prepared either by electrolysis of molten MgCl₂ or by metallothermic reduction of its halides by alkali or alkaline-earth metals

Here given data is concentration = 5.37 × 10⁻² m

We have to find pH= ?

pH = -log[HA]

pH = -log[Mg₂]

pH = -log[5.37 × 10⁻² m]

pH = 1.27

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Answer and Explanation:

The working-energy theorem defines work as the energy change brought on by the velocity change. The environment has acted on the object and it increases the energy of the object. When an object's velocity decreases, the object has worked on the world, and the object's energy decreases.

Unless the displacement is in the reverse direction and the force applied, then the work performed is negative. If the displacement is in the same direction and the force applied, then the work performed is positive.

Answer:

Work is the change in energy brought about by a change in velocity.  

When the velocity of an object increases, the environment has done work on the object and the energy of that object is increased.  

When the velocity of an object decreases, the object has done work on the environment and the energy of the object is decreased.

Explanation:

Answer:

you can also get oxygen from the mouth but you get more from the nose so i would chose nose

The concentrations of Pb₂+ and Cu₂+ when the cell potential falls to 0.35 V are 0.0147 M and 1.5 M, respectively.

To solve this problem, we can use the Nernst equation, which relates the standard cell potential to the concentrations of the species involved in the cell reaction. The Nernst equation is given by:

E = E° - (RT/nF) * ln(Q)

where:

E is the cell potential

E° is the standard cell potential

R is the gas constant (8.314 J/mol·K)

T is the temperature in kelvin

n is the number of electrons transferred in the cell reaction

F is Faraday's constant (96,485 C/mol)

For the given voltaic cell, the half-cell reactions and their standard reduction potentials are:

Pb₂+ + 2e- → Pb(s) E° = -0.13 V

Cu₂+ + 2e- → Cu(s) E° = +0.34 V

The overall cell reaction is:

Pb(s) + Cu₂+ → Pb₂+ + Cu(s)

The cell potential can be calculated as:

E = E° - (RT/nF) * ln(Q)

We are given that the initial concentrations of Pb₂+ and Cu₂+ are 0.05 M and 1.5 M, respectively. Therefore, the reaction quotient is:

Q = [Pb₂+]/[Cu₂+] = 0.05/1.5 = 0.0333

At this point, we do not know the cell potential, but we are told that it falls to 0.35 V. We can use this information to solve for the final concentrations of Pb2+ and Cu2+. Rearranging the Nernst equation, we get:

ln(Q) = (E° - E) * (nF/RT)

Substituting the given values, we get:

ln(0.0333) = (-0.13 - 0.34 - 0.035) * (2 * 96,485 / (8.314 * 298))

Solving for E, we get:

E = 0.035 V

Substituting this value back into the Nernst equation, we can solve for the final concentrations of Pb2+ and Cu2+:

E = E° - (RT/nF) * ln(Q)

0.035 = -0.13 - 0.34 - (2 * 96,485 / (8.314 * 298)) * ln([Pb₂+]/[Cu₂+])

Solving for [Pb₂+]/[Cu₂+], we get:

[Pb₂+]/[Cu₂+] = exp(-(0.035 + 0.13 + 0.34) * (8.314 * 298) / (2 * 96,485)) = 0.0098

Multiplying both sides by [Cu₂+], we get:

[Pb₂+] = 0.0098 * [Cu₂+] = 0.0098 * 1.5 = 0.0147 M

Therefore, the concentrations of Pb2+ and Cu2+ when the cell potential falls to 0.35 V are 0.0147 M and 1.5 M, respectively.

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Answer:

False, two objects can have separate chemical make-ups, yet still be the same density.

Answer:

Mass

Explanation:

because density is mass/volume

The temperature at which a reaction becomes spontaneous depends on the change in enthalpy and entropy, which can be calculated using the equation ΔG = ΔH - TΔS. In this case, a temperature above 1564 Kelvin is required for the reaction to be spontaneous.

The spontaneity of a reaction is determined by the change in free energy, which is calculated using the equation ΔG = ΔH - TΔS, where ΔG is the change in free energy, ΔH is the change in enthalpy, T is the temperature in Kelvin, and ΔS is the change in entropy.

If ΔG is negative, the reaction is spontaneous. Therefore, we need to find the temperature at which ΔG becomes negative.

Given ΔH = 498 kJ and ΔS = 319 J/K, we can plug these values into the equation and solve for T:

ΔG = ΔH - TΔS

-ΔG = TΔS - ΔH

T = (ΔH/ΔS)

T = (498 kJ / 319 J/K)

T = 1564 K

Therefore, the reaction will be spontaneous above a temperature of 1564 Kelvin.

In summary, the temperature at which a reaction becomes spontaneous depends on the change in enthalpy and entropy, which can be calculated using the equation ΔG = ΔH - TΔS. In this case, a temperature above 1564 Kelvin is required for the reaction to be spontaneous.

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Answer:

m = 0.0035 m.

Explanation:

Hello there!

In this case, since the formula for the computation of the molality is:

\(m=\frac{n_{solute}}{m_{solvent}}\)

We can first compute the moles of solute, K3PO4 by using its molar mass:

\(n=30mgK_3PO_4*\frac{1gK_3PO_4}{1000gK_3PO_4}*\frac{1molK_3PO_4}{212.27gK_3PO_4} =1.41x10^{-4}mol\)

Next, since the volume of water is 40.0 mL and its density is 1.00 g/mL we infer we have the same grams (40.0 g). Thus, we obtain the following molality by making sure we use the mass of water in kilograms (0.04000kg):

\(m=\frac{1.41x10^{-4}mol}{0.0400kg}\\\\m=0.0035m\)

In molal units (m=mol/kg).

Best regards!

The value for the rate constant of a reaction can generally be expected to increase with increasing temperature.

The rate constant is a measure of the speed of a chemical reaction and is directly proportional to temperature, according to the Arrhenius equation. This means that as temperature increases, the rate constant also increases. This is true regardless of whether the reaction is exothermic or endothermic.

The Arrhenius equation shows that the rate constant of a reaction (k) is exponentially dependent on the activation energy (Ea) and inversely dependent on the temperature (T). As the temperature increases, the rate constant and the reaction rate tend to increase due to more energetic collisions between reactant molecules.

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Answer:

Listed below.

Explanation:

Answer:

≈ 0.104 liters  

Explanation:

We can use Boyle's Law: \(P_{1}V_{1} = P_{2}V_{2}\)

P₁ = 2.50 atm

V₁ = 25.0 mL

P₂ = 457 mmHg

V₂ = ?

Because pressure should be in atm we will convert 457 mmHg to units in atm:

1 atm = 760mmHg so we can divide 457 by 760 and we get ≈ 0.601atm

Next we can plug in the units to the equation for Boyle's Law:

(2.50)(25.0) = (0.601)(V₂)

Solve for V₂

V₂ will give you ≈ 104mL or 0.104L

Either is correct depending on which unit they are asking you to use

We can solve the problem using the Ideal Gas Law which states that:

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.

Rearranging this equation, we get:

P = nRT/V.

We have to find the pressure of argon in kPa given that it fills an insulated, rigid container with a volume of 0.8 m3 and the temperature within the container is 83°C. The number of moles can be calculated as:

n = mass/molar mass = 5.2 kg/39.948 g/mol = 130.22 moles.

The gas constant R is equal to 8.314 J/(mol K).

The temperature has to be in Kelvin, which is equal to= 83°C + 273.15 = 356.15 K.

Therefore, the pressure can be calculated.

The pressure of the argon in kPa is 3696.98

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The secondary coolant is converted to steam, which runs the steam turbine to generate electricity.

Secondary coolant:

The reactor coolant flows from the reactor to the steam generator. Inside of the steam generator, the hot reactor coolant flows inside of the many tubes. The secondary coolant, or feedwater, flows around the outside of the tubes, where it picks up heat from the primary coolant.

The secondary system is designed to transport heat from primary system to the atmosphere via an evaporative cooling tower. The typical system is designed to furnish 12.6 m3/min of water to the plate type heat exchanger at an inlet temperature of about 33 °C and an outlet temperature of about 42 °C.

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The alum produced during experiment for every 210 can is 38.21 kg

Experiment can be defined as a technique used to establish or refute a hypothesis, or to determine the efficacy or likelihood of anything new.

It can also be defined as a series of acts and observations carried out in the context of attempting to solve a specific problem or question.

According to your experiment 0.4996 gram of aluminum will produce 5.183 grams of alum.

Mass of 1 aluminum can = 13.5 g

Mass of 210 can = 13.5 x 210 = 2835g

Mass of alum produced by one gram of aluminum = 13.48 g

Mass of alum produced by 2835 g = 13.48 x 2835

                                                          = 38.21 kg

The amount of alum produced by 210 can = 38.21 kg

Thus, the alum produced during experiment for every 210 can is 38.21 kg

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Answer:

Explanation:

An element with atomic number 18 is a noble gas.

The element with atomic number 19 will have one extra electron so it can donate one electron or shed one electron to attain noble gas configuration .

It tends to shed one electron to become positively charged ion . Hence they are electro-positive elements .  

Similarly the element with atomic number 17 will have one short  electron so it can gain  one electron  to attain noble gas configuration .

They  tend to gain  one electron to become negatively charged ion . Hence they are electro-negative  elements . They have high  electronegativity .

Answer:

this is answer brother

Ionic compounds include at least 1 metal because metals need to donate electrons. (In ionic bonds one compound takes electrons, therefore you need a metal to donate electrons).

Otherwise, with two non-metals the compounds would likely share electrons.

The highest melting point based on the ionic bonding model is MgF2.

Ionic bonding is a type of chemical bond that occurs as a result of the transfer of valence electrons from one atom to another. A cation and an anion are formed as a result of this transfer. The ionic bond is the force that holds these oppositely charged ions together. Choose the compound that should have the highest melting point based on the ionic bonding model. The correct answer is MgF2.The melting point of a substance is influenced by a variety of factors. Stronger intermolecular forces between atoms and molecules generally result in a higher melting point. Ionic compounds, for example, have high melting points due to their strong ionic bonds. The ionic compound that should have the highest melting point is the one with the most ionic bonds. According to the ionic bonding model, MgF2 should have the highest melting point. Because the electronegativity of magnesium is lower than that of fluorine, magnesium loses electrons, resulting in Mg2+ ions and F− ions. As a result, strong electrostatic forces of attraction are formed between these ions, resulting in strong ionic bonds. In comparison to the other options listed, MgF2 has the highest ionic character, making it the correct answer.

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Answer:

Example of a fusion dish: combination of smoked salmon wrapped in rice paper, with avocado, cucumber and crab sticks. Fusion cuisine is cuisine that combines elements of different culinary traditions that originate from different countries, regions, or cultures.

Tinctures are the antimicrobial solutions with alcohol or water -alcohol mixtures as the solvent.

A tincture reveals the presence of something. It is extracted from plants in an alcohol solution. Specific proportions of water, alcohol, and dissolved plant material make up tinctures. The ratios vary depending on the plant we're using and what we want to extract. The alcohol functions in two ways: first, as a preservative, and second, as a solvent that draws "constituents"—compounds—from the plant.

The alcohol being utilized is food-grade alcohol. Its scientific name is ethanol, sometimes known as ethyl alcohol, and it is the same substance found in beer, wine, and all other alcoholic beverages in your liquor cabinet. Herbal tinctures use alcohol because it is an excellent solvent for herbs. Alcohol is also used as preservatives. Example; Tincture of iodine in solution of iodine in alcohol

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Direct contact between objects causes conduction or heat transfer. The heat is transferred inside the fluid during convection. Heat transfer in radiation happens by electromagnetic waves without the use of particles.

First, ascertain whether the two things are in contact. If they are, conduction is how heat is transferred between them. Determine whether there is a fluid medium, such as a liquid or gas, connecting the items if they are not in contact.

Evidence of heat transport is apparent. Convection is the phenomenon that causes the air to shimmer over radiators. Conduction is the phenomenon that causes you to feel warm when you place your hand on a spoon that has been sitting in a hot bowl of soup (radiation).

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1) balanced chemical equation

\(2\ C_{4}H_{10}_{(g)}\ +\ 13\ O_{2}_{(g)}\ ->\ 10\ H_{2}O_{(g)}\ +\ 8\ CO_{2}_{(g)}\)

2) convert mass of CO₂ to moles

\(=71.9g\ CO_{2}\ x\ \frac{1\ mol\ CO_{2}}{44.01g\ CO_{2}} \\\\=1.633719609\)

3) multiply by molar ratio

\(=1.633719609\ mol\ CO_{2}\ x\ \frac{2\ mol\ C_{4}H_{10}}{8\ mol\ CO_{2}}\\\\=0.4084299023\)

4) convert moles of C₄H₁₀ to mass

\(=0.4084299023\ mol\ C_{4}H_{10}\ x\ \frac{58.14g\ C_{4}H_{10}}{1\ mol\ C_{4}H_{10}}\\\\=23.74611452\)

= 23.7 grams of C₄H₁₀ is needed to produce 71.9 grams of CO₂