Calculate the height of a column of water at 25 °C that corresponds to normal atmospheric pressure. The density of water at this temperature is 1.0 g/

The temperatures and pressures when the liquid and gaseous phases are equally stable and in equilibrium.

The temperature range and pressure range at which a supercritical fluid can exist. The physical states of a substance at various pressure and temperature levels are depicted in a phase diagram. In this diagram, the pressure is often depicted on the y-axis while the temperature is displayed on the x-axis. The critical point, which is where the line separating the liquid and gaseous phases disappears, is depicted graphically. A substance that has passed the critical point is referred to as a supercritical fluid. Based on the description provided above, all responses other than A are false. The flexibility to alter fluid density-directly affecting extraction parameters like temperature and pressure.

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There will be 0.4589 mL of ethyl acetate left in the space after evaporation.

The conversion of a liquid substance into a gas is known as evaporation. As a result of the liquid absorbing energy from its surroundings, molecules begin to travel faster and faster until they finally become a vapour and escape into the environment. Usually, the energy is absorbed as heat, but it can also be in the form of light or electricity.

No, the ethyl acetate won't all evaporate. The amount of ethyl acetate that will stay in the space after evaporation can be determined using the ideal gas law. As per the ideal gas law, PV = nRT

P is the overall system pressure, V is the room's volume, n is the amount of ethyl acetate in moles, R is the ideal gas constant, and T is the temperature.

To solve for n, the quantity of moles of ethyl acetate, we can rearrange the equation as follows: n = PV/RT

When the values are plugged in, we get:

n = (94.9 torr)(7.25 m x 2.75 m x 2.75 m)/(8.314 J/K mol)(298 K)

\(n = 4.666 \times 10^{-3} mol\)

The molar mass of ethyl acetate (88.11 g/mol) can then be used to compute the mass of ethyl acetate:

Mass = \(n \times M = (4.666 x 10^{-3} mol)(88.11 g/mol)\) = 0.4125 g

Using the density of ethyl acetate (0.901 g/mL), it is possible to determine the volume of the liquid that is still present:

Volume = mass/density = (0.4125 g)/(0.901 g/mL) = 0.4589 mL

As a result, there will be 0.4589 mL of ethyl acetate left in the space after evaporation.

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The amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.

To calculate the amount of copper in moles in a pure copper sheet, we need to use the molar mass of copper and the given mass of the sheet.

The molar mass of copper (Cu) is approximately 63.55 g/mol. This value represents the mass of one mole of copper atoms.

Given that the mass of the pure copper sheet is 27.5 g, we can calculate the number of moles using the following formula:

moles = mass / molar mass

Substituting the values:

moles = 27.5 g / 63.55 g/mol

moles ≈ 0.433 mol

Therefore, the amount of copper in moles in the 27.5 g pure copper sheet is approximately 0.433 moles.

To arrive at this result, we divided the given mass of the sheet (27.5 g) by the molar mass of copper (63.55 g/mol). This calculation allows us to convert the mass of the sheet into the corresponding number of moles of copper.

The result tells us that the 27.5 g pure copper sheet contains approximately 0.433 moles of copper atoms. This conversion to moles is useful in various chemical calculations and allows for easier comparison and analysis of quantities on a molecular scale.

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Yes, s = u+v/2+t, where s is the displacement, u is the beginning velocity, v is the end velocity, and t is the time required, is the equation of motion for a body travelling with uniform acceleration.

The basic law of motion, which states that a body's rate of change in displacement is directly proportional to its velocity, provides the basis for this equation. The equation of motion for a body travelling with constant acceleration, s = ut + 1/2at2, may be used to derive it.

The equation of motion for a body travelling with uniform acceleration is given by replacing the value of an as (v-u)/t and getting s = u+v/2+t. This formula is only accurate when the body's acceleration is constant and uniform.

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Answer:

1.8x10_24 moleclues

Explanation:

because you have to divide the numbers  and then times them together

The empirical formula for each compound are as follow,

a)\(Ag_2 O\)

b)\(Co_3As_2O_8\)

c)\(SeBr_4\)

As per the data share in the above question are as follow,

The mass of their constituent elements are as follow,

a) Ag=1.651 g

   O=0.1224 g

b)Co =0.672 g

    As =0.569 g

    O=0.486 g

c) Se =1.443 g

    Br =5.841 g

We have to calculate the empirical formula for each compound.

a)Now Moles of (given mass upon Molar mass) \(Ag=\frac{1.651}{108} =0.015 \:moles\)

Moles of \(O=\frac{0.1224}{8\times 2} =0.0077 \:moles\)

Smallest mole value \(0.0077 \:moles\)

Divide all component by smallest mass.

Therefore \(Ag \Rightarrow\frac{0.015}{0.0077} \rightarrow2\\\\O \Rightarrow\frac{0.0077}{0.0077} \rightarrow1\)

Combine to get empirical formula,

\(Ag_2 O\)

b)Now Moles of (given mass upon Molar mass) \(Co=\frac{0672}{59} =0.011 \:moles\)

Moles of \(As=\frac{0.569}{75} =0.0076\: moles\)

Moles of \(O=\frac{0.486}{16} =0.0304 \:moles\)

Smallest mole value \(0.0076 \:moles\)

Divide all component by smallest mass.

Therefore

\(Co \Rightarrow\frac{0.011}{0.0076} \rightarrow1.5\rightarrow1.5 \times 2\rightarrow3\\\\As \Rightarrow\frac{0.0076}{0.0076} \rightarrow1\rightarrow1 \times 2\rightarrow2\\\\O \Rightarrow\frac{0.0304}{0.0076} \rightarrow4\rightarrow4 \times 2\rightarrow8\)

Combine to get empirical formula,

\(Co_3As_2O_8\)

c)Now Moles of (given mass upon Molar mass) \(Se=\frac{1.443}{79} =0.018 \:moles\)

Moles of \(Br=\frac{5.841}{80} =0.073 \:moles\)

Smallest mole value \(0.018 \:moles\)

Divide all component by smallest mass.

Therefore

\(Se \Rightarrow\frac{0.018}{0.018} \rightarrow1\\\\Br \Rightarrow\frac{0.073}{0.018} \rightarrow4\)

Combine to get empirical formula,

\(SeBr_4\)

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Answer:

3.30 gSiO2 / 60.085g SiO2 x 2 mol 0 / 1 mol SiO2 x (6.022*1023 ) = 6.61*1022 O atoms

Explanation:

All processes for which the temperature stays constant are described by Boyle's law.

Boyle's law is expressed as p1 * V1 = p2 * V2, where p1 and V1 are starting pressure and volume, respectively. The ultimate values of these gas parameters are p2 and V2.

Boyle's law formula can be stated in a variety of ways, depending on the parameter we want to estimate. Let's imagine we wish to determine the pressure that results from changing a gas' volume under isothermal conditions. The Boyle's law equation thus reads: p2 = p1 * V1 / V2 or p2 / p1 = V1 / V2.

As we can see, the final-to-initial pressure ratio is the opposite of the volume ratio.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

HCl is not a catalyst because these are not used up during the chemical reactions.

Explanation:

Hello there!

In this case, according to the performed experiments, it is possible for us to realize that HCl cannot be a catalyst for this reaction because it is used up during the reaction. This is explained by the fact that catalyst are able to return to the original form once the reaction has gone to completion; this is the example of palladium in the hydrogenation or dehydrogenation of hydrocarbons depending on the case. Moreover, we know that the catalysts increase the reaction rate because they decrease the activation energy of the reaction and therefore the student observed such increase.

Best regards!

The maximum mass of water that could be produced by the chemical reaction is 162 g.

The given chemical equation is: 2 C8H18(l) + 25 O2(g) → 16 CO2(g) + 18 H2O(l)In the chemical reaction of liquid octane with gaseous oxygen, the products are gaseous carbon dioxide and gaseous water.According to the balanced chemical equation, 2 moles of C8H18 react with 25 moles of O2 to form 18 moles of H2O.So, 1 mole of C8H18 react with 25/2 = 12.5 moles of O2 to form 9 moles of H2O.The molar mass of C8H18 is 114 g/mol. So, the number of moles in 17 g of C8H18 is:17 g / 114 g/mol = 0.149 molThe molar mass of O2 is 32 g/mol. So, the number of moles in 112 g of O2 is:112 g / 32 g/mol = 3.5 molFrom the balanced chemical equation, 1 mole of C8H18 react with 12.5 moles of O2 to form 9 moles of H2O.So, the number of moles of O2 required to react with 0.149 mol of C8H18 to form H2O is:(12.5 mol / 1 mol) × (0.149 mol / 2 mol) = 0.935 molThe maximum number of moles of H2O that can be produced from 0.149 mol of C8H18 and 0.935 mol of O2 is 9 mol.So, the mass of water produced from 17 g of C8H18 and 112 g of O2 is:9 mol × 18 g/mol = 162 g

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Answer:

The name of the smallest atom is Hydrogen

Explanation:

It's the first atom in the periodic table, meaning it has the least protons or electrions, I forgot.

Answer:

Nuclear decay changes the number of protons in the nucleus of an atom, and in doing so changes the element. ... If the same element were to undergo beta decay, the mass number would stay the same, and the atomic number would increase by 1, giving neptunium-235. Also Radioactive decay involves the emission of a particle and/or energy as one atom changes into another. In most instances, the atom changes its identity to become a new element.

Hope this helps you.

Answer:

Not sure sorry :(

Explanation:

The reason for the fourth measurement is that the solution is  saturated. Option C in the question.

According to the Beer Lambert's law, the absorbance of the solution is found to the proportional to the concentration of the solution. This implies that as the concentration of the solution increases, the absorbance of the solution also increases.

The absorbance is proportional to the concentration, and the pathlength of the cell where the measurement is taken.

We can now see from the table that the absorbance of the solution is largely affected by the concentration of the solution and not really the pathlength.

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Answer:The pressure exerted by the gas is 100kPa

Explanation:Let's apply the Charles Gay Lussac law, to solve the question.

At constant volume, the pressure varies proportionally with the temperature.

P initial / T° initial = P final / T° final

50kPa / 20°C = P final / 40°C

Temperature has increased the double, so the pressure will be increased, the double too.

100 kPa

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The percent by mass of nitrogen in ammonia (NH3) is approximately 82.15%

Calculating the mass of nitrogen to the total mass of the compound and then expressing the result as a percentage will allow us to determine the percent by mass of nitrogen in NH3 (ammonia).

Ammonia's molecular structure, NH3, indicates that it is made up of one nitrogen atom (N) and three hydrogen atoms (H). We must take both the molar masses of nitrogen and ammonia into account when calculating the percent by mass of nitrogen.

Nitrogen's (N) molar mass is roughly 14.01 g/mol. The molar masses of nitrogen and hydrogen are added to determine the molar mass of ammonia (NH3). Since hydrogen's molar mass is around 1.01 g/mol, ammonia's molar mass is:

(3 mol H 1.01 g/mol) + (1 mol N 14.01 g/mol) = 17.03 g/mol = NH3.

Now, we can use the following formula to get the nitrogen content of ammonia in percent by mass:

(Mass of nitrogen / Mass of ammonia) / 100% is the percentage of nitrogen by mass.

Ammonia weighs 17.03 g/mol and contains 14.01 g/mol of nitrogen by mass. By entering these values, we obtain:

(14.01 g/mol / 17.03 g/mol) 100% 82.15 % of nitrogen by mass

Ammonia (NH3) has a nitrogen content that is roughly 82.15 percent by mass.

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Answer:

Because in Dark it will be fully dark and we cannot see any thing

Answer:

4204 K

Explanation:

Step 1: Data

Given data

Required data

Step 2: Calculate the temperature of the gas

We will use the following expression derived from the ideal gas equation.

P × M = ρ × R × T

T = P × M/ρ × R

T = 0.5073 atm × (352.02 g/mol)/(0.5820 g/L) × (0.08206 atm.L/mol.K)

T = 4204 K

The temperature of the uranium hexafluoride has been 3,737.36 K.

The uranium hexafluoride has been the gas. Assuming the gas to follow the ideal equation:

Pressure × Volume = Moles × R × Temperature

Moles can be defined as:

Moles = \(\rm \dfrac{mass}{molecular\;mass}\)

The ideal gas equation can be written in terms of mass as:

Pressure × Volume = \(\rm \dfrac{mass}{molecular\;mass}\) × R × Temperature

Pressure = \(\rm \dfrac{mass}{volume}\) × \(\rm \dfrac{1}{molecular\;mass}\) × R × Temperature

Density can be defined as:

Density = \(\rm \dfrac{mass}{volume}\)

The equation in terms of density can be written as:

Pressure = Density × \(\rm \dfrac{1}{molecular\;mass}\) × R × Temperature

The molecular mass of uranium hexafluoride = 352.02 g/mol

R = 0.0816 L.atm/K.mol

Pressure = 0.5073 atm

Density = 0.5820 g/L

Substituting the values:

0.5073 atm = 0.5820 g/L × \(\rm \dfrac{1}{352.02\;g/mol}\) × 0.0821 L.atm/K.mol × Temperature

0.5073 = 0.000135 × Temperature

Temperature = 3,737.36 K.

The temperature of the uranium hexafluoride has been 3,737.36 K.

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The calculated formula masses to 133.5 amu, we find that the substance with a formula mass closest to 133.5 amu is (d) AlCl3. Therefore, the answer is option D.

To identify the substance with a formula mass of 133.5 amu, we need to calculate the formula mass of each given substance and compare it to 133.5 amu.

(a) MgCl2:

The formula mass of MgCl2 can be calculated by adding the atomic masses of magnesium (Mg) and chlorine (Cl).

Mg: atomic mass = 24.31 amu

Cl: atomic mass = 35.45 amu

Formula mass of MgCl2 = (24.31 amu) + 2(35.45 amu) = 95.21 amu

(b) SCl:

The formula mass of SCl can be calculated by adding the atomic masses of sulfur (S) and chlorine (Cl).

S: atomic mass = 32.07 amu

Cl: atomic mass = 35.45 amu

Formula mass of SCl = 32.07 amu + 35.45 amu = 67.52 amu

(c) BCl:

The formula mass of BCl can be calculated by adding the atomic mass of boron (B) and chlorine (Cl).

B: atomic mass = 10.81 amu

Cl: atomic mass = 35.45 amu

Formula mass of BCl = 10.81 amu + 35.45 amu = 46.26 amu

(d) AlCl3:

The formula mass of AlCl3 can be calculated by adding the atomic mass of aluminum (Al) and 3 times the atomic mass of chlorine (Cl).

Al: atomic mass = 26.98 amu

Cl: atomic mass = 35.45 amu

Formula mass of AlCl3 = 26.98 amu + 3(35.45 amu) = 133.78 amu. Option D

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Answer:

body hair

Explanation:

in the hot climate,human bodies had to adapt inscrasing the number of bodyhair on the skin to coll off the body

Answer:

730 N

Explanation:

force =mass ×acceleration

force= 73kg×10m/s

F=730N

The type of movement that occurs in the plate movement listed above include the following:

These are gigantic pieces of the Earth's crust and uppermost mantle and are made up of oceanic crust and continental crust.

A convergent boundary as the name implies occurs when lithospheric plates are moving towards one another.

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The original mass of Tritium (hydrogen-3) was 13.4mg if its current mass is 0.42 micrograms.

The formula for radioactive decay is given by:

N = N0 x (1/2)^(t/T)

where,

N = final number of radioactive atoms

N0 = initial number of radioactive atoms

t = time elapsed

T = half-life of the radioactive substance

Let's substitute the given values into the formula:

0.42 μg = N0 x (1/2)^(60/12)

0.42 μg = N0 x (1/2)^5

0.42 μg = N0 x 1/32

N0 = 0.42 μg x 32

N0 = 13.44 μg

Therefore, the original mass of the tritium sample was 13.44 micrograms.

What is radioactive decay?

Radioactive decay is the process by which an unstable atomic nucleus loses energy by emitting ionizing radiation, such as alpha particles, beta particles, and gamma rays. This process can result in a change in the number of protons and/or neutrons in the nucleus, leading to the transformation of one element into another. The rate of decay is typically characterized by a half-life, which is the time required for half of the atoms in a sample to decay.

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Answer:

\(\Delta H=35.3J\)

Explanation:

Hello,

In this case, since the dissolution of silver chloride involves a change in enthalpy of 65.5kJ per 1 mole  when undergone, for 5.44x10⁻⁴ moles, the enthalpy change is:

\(\Delta H=65.5\frac{kJ}{1mol}*5.44x10^{-4}mol\\ \\\Delta H=0.0353kJ*\frac{1000J}{1kJ}\\ \\\Delta H=35.3J\)

Best regards.

The change in enthalpy (in joules) when AgCl dissolves in water is 35.362 Joules.

Given the following data:

To find the change in enthalpy (in joules) when AgCl dissolves in water according to the following chemical equation:

                                 \(A_gC_l_{(s)}\)  -----> \(Ag^{+}_{(aq)} + Cl^{-}_{(aq)}\)    \(\Delta H = 65.5 \;kJ/mol\)

1 mole of silver chloride =  \(65.5\)  × \(10^{3}\) J/mol

\(5.44\) × \(10^{-4}\) mole of silver chloride = X J/mol

Cross-multiplying, we have:

\(X =\) \(5.44\) × \(10^{-4}\) × \(65.5\)  × \(10^{3}\)

\(X = 0.544\) × \(65.5\)

X = 35.362 Joules.

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Answer:

Density of the solid is 1.63g/mL

Explanation:

Hello,

Data;

Mass of solid = 32.65g

Mass of toluene = ?

Mass of solid + toluene = 58.58g

Density of toluene = 0.864g/mL

Mass of toluene = (mass of solid + toluene) - mass of solid

Mass of toluene = 58.58 - 32.65

Mass of toluene = 25.93g

But density = mass / volume

Density of toluene = mass of toluene / volume of toluene

Volume of toluene = mass of toluene / density of toluene

Volume of toluene = 25.93 / 0.864

Volume of toluene = 30.01mL

Volume of solid = total volume of the mixture (solid + toluene) - volume of toluene

Volume of solid = 50 - 30.01

Volume of solid = 19.99mL

Density of the solid = mass of solid / volume of solid

Density of the solid = 32.65 / 19.99

Density of the solid = 1.63g/mL

Therefore the density of the solid is 1.63g/mL