Which of the following Substances would have the highest vapor pressure at 298 K?
A) propanol (b.p.= 97 °C)
B) acetone (b.p.=56°C)
C) benzene (b.p. = 80°C)
D) chloroform (b.p. = 61°C)​

Answer:

2g

Explanation:

The balanced equation for the reaction is given below:

2Na + 2H2O —> 2NaOH + H2

Next, we'll determine the mass of the water (H2O) that reacted and the mass of H2 produced from the balanced equation.

This is illustrated below:

Molar Mass of H2O = (2x1) + 16 = 18g/mol

Mass of H2O from the balanced equation = 2 x 18 = 36g

Molar Mass of H2 = 2x1 = 2g/mol

Therefore, from the balanced equation above, 36g of H2O reacted to produce 2g of H2.

From the illustration above, we can see that 36g of water will produce 2g of H2.

Answer:

b) +2 and +3.

Explanation:

Hello,

In this case, given the molecular formulas:

[tex]XO[/tex]

And:

[tex]X_2O_3[/tex]

We can relate the subscripts with the oxidation states by knowing that they are crossed when the compound is formed, for that reason, we notice that oxygen oxidation state should be -2 for both cases and the oxidation state of X in the first formula must be +2 since both X and O has one as their subscript as they were simplified:

[tex]X^{+2}O^{-2}[/tex]

Moreover, for the second case the oxidation state of X should be +3 in order to obtain 3 as the subscript of oxygen:

[tex]X_2^{+3}O_3^{-2}[/tex]

Thus, answer is b)+2 and +3

Best regards.

In the case when the element x forms the oxides xo and x2o3 the oxidation numbers of element x are option b +2 and +3.

The equation should be X2O3.

Here we can link the subscripts with the oxidation states by knowing that they should not be linked at the time when the compound should be formed. So here the oxygen oxidation state should be -2 and the oxidation state of x should be +2.

Its like

X+2O-2

Here in the second case, the oxidation state of x should be +3 for obtaining 3 and treated as the subscript of oxygen.

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Answer:

1.68867925

Explanation: molarity = moles of solute divided by liters of solution so 3.58/2.12 equals 1.68867925

Answer:

4 days

Explanation:

A radioactive cloud is said Ron contain Iodine-131. It has a half-life of 8 days. If the waste must decay to a concentration of less than 0.1% to be considered safe, then it will take approximately 4 days days to reach safe levels under normal circumstances.

Answer:

100/2 ➙ 50/2 ➙  25/2 ➙  12.5/2 ➙ 6.25/2 ➙  3.13/2 ➙  1.56/2 ➙  0.78/2 ➙  0.39/2 ➙  0.195/2 ➙  0.0975

10 half lives x 8 days/half live = 80 days

Answer:

I believe it is B

Explanation:

Taken from the California race voting %

Answer:

50.00 g of NO

Explanation:

Remember that the balanced chemical reaction equation is indispensable in solving any question that has to do with stoichiometry. Hence the first step in solving the problem is noting down the balanced chemical reaction equation.

2NO(g) + O2 (g)→ 2NO2(g)

Now we try to find out the reactant in excess. The reactant in excess gives the greater mass of product.

For O2;

From the balanced reaction equation;

32 g of O2 yields 92g of NO2

16.00g of O2 will yield 16.00×92/32 = 46g of NO2

For NO;

30g of NO yields 92g of NO2

80.00 g of NO yields 80.00 × 92/30 = 245.33 g of NO2

Hence NO is the reactant in excess.

If 1 mole of O2 reacts with 2 moles of NO2 according to the balanced reaction equation

Then 32 g of O2 reacts with 60g of NO according to the balanced reaction equation

16.00 g of O2 reacts with 16.00 × 60 /32 = 30 g of NO

Hence mass of excess reactant used in the reaction = total mass of NO- mass of NO reacted= 80.00g -30.00g = 50.00 g of NO

Hence the mass of excess reactant used in the reaction is 50.00 g of NO

Answer:

The amount in grams of the excess reactant (NO) used in the chemical reaction is 30 grams

Explanation:

The balanced chemical equation for the reaction is presented as follows;

O₂ (g) + 2NO (g) → 2NO₂ (g)

Therefore, one mole of O₂ combines with two moles of NO to produce two moles NO₂

Molar mass of oxygen gas, O₂ = 31.999 g/mol

Mass of oxygen gas, O₂, present = 16.00 g

Molar mass of nitric oxide, NO = 30.01 g/mol

Mass of nitric oxide, NO, present = 80.008

Number of moles, n, of a sample of a substance is given by the following relation;

[tex]n = \frac{Mass \ m, \, of \, sample}{Molar \, mass \, of \, sample}[/tex]

Number of moles of O₂ present is presented as follows;

[tex]n_{O_2}=\frac{16 \, g}{31.999 \, g} = 0.5 \, moles[/tex]

Number of moles of NO present is presented as follows;

[tex]n_{NO}=\frac{80 \, g}{30.01 \, g} = 2.67 \, moles[/tex]

Hence, since one mole of O₂ combines with two moles of NO to produce two moles NO₂, 0.5 moles of O₂ will combine with one mole of NO to produce one mole NO₂. Therefore, the oxygen is used up in the reaction and the nitric oxide is the excess reactant.

Number of moles of nitric oxide, NO, consumed in the reaction = 1 mole

Mass, m of nitric oxide used = number of moles of nitric oxide × molar mass of nitric oxide

∴ Mass of nitric oxide used = 1 mole × 30.01 g/mol = 30.01 grams

Rounding to the nearest whole number, we have;

Mass of nitric oxide used = 30 grams.

The amount in grams of the excess reactant (NO) used in the chemical reaction = 30 grams.

Answer:

Hydrogen

Explanation:

Four hydrogen atoms combine together during fusion reaction on the sun. In the core of the Sun hydrogen is being converted into helium.

Fusion is the process by which the sun and stars are powered. It is the reaction in which two hydrogen atoms combine or fuse to form a helium atom. Some of the hydrogen's mass is converted into energy during the process.

The Sun and other stars are powered by nuclear fusion reactions. A fusion reaction occurs when two light nuclei combine to form a single heavier nucleus.

When two atoms collide, they fuse to form a heavier atom, such as when two hydrogen atoms fuse to form one helium atom. This is the same process that powers the sun and generates enormous amounts of energy many times more than fission.

Thus, Four hydrogen atoms combine together during fusion reaction on the sun.

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Answer: In New York City

Explanation: I'm not a nerd but I think it would be that because when your in the middle of new York city, and you scream it echos.

Answer:

I believe it’s 4

Explanation:

Answer:

potential energy of an object depend on three factors. If an object has less mass,it will travel more distance, and Higher the mass of an object Distance tra

Explanation:

Answer:

1) hydrogen peroxide should be stored in dark bottles away from light

2) hydrogen peroxide should be stored in a cool place.

3) Drops of sodium phosphate may be added to inhibit its catalytic decomposition

Explanation:

Hydrogen peroxide is known to dissociate according to the equation;

2H2O2--->2H2O+O2.

This decomposition is facilitated by the following factors;

1) heat

2) light

3) presence of trace amounts of a catalyst

This implies that, if the user stores the hydrogen peroxide in a dark bottle, away from sunlight. It decreases its chances of decomposition.

Similarly, if the hydrogen peroxide bottle is stored in a cool environment, it is not decomposed by heat.

Lastly, drops of an inhibitor such as sodium phosphate may be added to inhibit the effect of any catalyst that may have mistakenly contaminated the hydrogen peroxide sample.

Answer:

your answer is (a) Copper Metal

Explanation:

Copper exists as a chemical element with the symbol Cu and atomic number 29. It exists as a soft, malleable, and ductile metal with very increased thermal and electrical conductivity. A freshly revealed surface of pure copper contains a pinkish-orange color.

Copper(II) nitrate represents any component of the family of inorganic compounds with the formula Cu(NO₃)₂ₓ. The hydrates exist in blue solids. Anhydrous copper nitrate includes blue-green crystals and sublimes in a vacuum at 150-200 °C. Familiar hydrates exist the hemipentahydrate and trihydrate.

Mass exists the quantity of matter in a physical body. It exists even a measure of the body's inertia, the resistance to acceleration (difference of velocity) when a net force exists applied. An object's mass also defines the strength of its gravitational attraction to other bodies.

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Answer:

I guess it would be C.

Explanation:

because it sounds familiar

Answer:

the answer is 0.13 moles

Final answer:

To find the number of moles in 2.35 grams of H2O, divide the mass by the molar mass of H2O (18.015 g/mol) to get approximately 0.130 moles.

Explanation:

To calculate the number of moles in 2.35 grams of H2O, you need to use the molar mass of water as the conversion factor. The molar mass of water (H2O) is calculated by summing the molar masses of 2 hydrogen atoms (2 x 1.0079 g/mol) and 1 oxygen atom (15.999 g/mol), which equals 18.015 g/mol.

To find the moles of water in 2.35 grams, use the following conversion:

Divide the mass of the H2O by the molar mass:

2.35 g H2O / 18.015 g/mol = 0.130 moles of H2O

Answer:

C2H4Cl2

Explanation:

This is the formula this might help you.

The formula for 1,1-dichloroethane is C₂H₄Cl₂, where both chlorine atoms are attached to the first carbon of the ethane molecule.

The chemical formula for 1,1-dichloroethane is C₂H₄Cl₂. In organic chemistry, the prefixes indicate the number of substituents and their positions on the carbon chain. The '1,1-' prefix means that both chlorine atoms are attached to the first carbon in the ethane molecule, which has two carbons. In 1,1-dichloroethane, both chlorines are on the same carbon atom.

Answer:

hmm lets see    The following is the sequence of the steps from when the stimulus is received to the reaction of the body: 1. The stimulus is received by the sensory receptors. 2. Sensory neurons carry stimulus information to the brain or spinal cord. 3. The brain processes the information through interneurons.

Explanation:

Answer:

Hey wilson Its Elijah Headley Im finished with half my classes now and finna finish 3 instead o 2

Explanation:

Answer:

The temperature of the gas contained in the container is -259.35° C

Explanation:

To find the unit of degrees in Celsius (° C) in this case, the ideal gas law equation is used.

PV = nRT

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

Solving for T would be: PV / nR

T = ( 1.4113 atm * 2.00 L ) / ( 2.49 mol * 0.08205746 atm * L / mol * K  )

T = 2.8226 / 0.2043

T = 13.8K = -259.35 ° C

Answer:

The Celsius temperature of the gas is ‪-259.34 ° C

Explanation:

To answer the question, we note that the universal gas equation can be expressed as follows;

P·V = n·R·T

Therefore;

[tex]T = \frac{P \cdot V}{R \cdot n}[/tex]

Where:

n = Number of moles  = 2.49 mol

P = Pressure = 143 kPa = 143000 Pa

V = Volume = 2.00 L = ‪0.002 m³

T = Temperature in Kelvin, K = Required

R = Universal Gas Constant =  8.3145 J/(mol·K)

Plugging in the values, we have;

[tex]T = \frac{143000 \times 0.002 }{8.3145 \times 2.49 } = 13.81 \, K[/tex]

Hence the temperature of the gas = 13.81 K

Converting the Kelvin temperature to Celsius temperature, we have

Celsius temperature = Kelvin temperature - 273.15

Therefore, 13.81 K to Celsius temperature gives;

13.81 - 273.15 = ‪-259.34 ° C.

Answer:

1) Time (Half-Life Cycles)

2) Radioactive Adams

Explanation:

on edg

Answer:

1) Time (Half-Life Cycles)

2) Radioactive Adams

3) quite strongly

4) Radioactive decay is a random event

Explanation: edge2023

Answer:

Explanation:

20.88L

Answer:

6 moles of oxygen, or 3O2.

Explanation:

I would build a proportion for this:

[tex] \frac{2(2)}{2} = \frac{12}{x} \\ 4x = 24 \\ x = 6[/tex]

Answer:

potential energy is answer

Explanation:

The nuclear decay of helium into lithium through the emission of an electron is called beta decay. This process changes the composition of the nucleus from helium (^6_2He) to lithium (^6_3Li), while conserving the mass number.

In this process, a neutron within the helium nucleus decays into a proton, electron (specifically, a beta particle), and an antineutrino. Since the number of protons in the nucleus increases from two to three, helium (^6_2He) is transformed into lithium (^6_3Li).

During beta decay, the element ascends one place in the periodic table, even though the mass number (top number) remains the same, as it involves only a change in the type of nucleon (neutron to proton) rather than a loss of nucleons. In this process, the emitted electron (beta particle) is represented by the symbol ^0_-1e, underscoring the fact that it has negligible mass (thus mass number 0) and a negative charge (thus -1).

The relevance of lithium-6 containing three protons, three neutrons, and three electrons is that it represents the lithium formed from the beta decay of helium-6. This lithium isotope, ^6_3Li or Li, is easily ionized due to its electron configuration, which makes lithium a typical alkali metal.

Answer:

D) Dispersion; dispersion

Explanation:

Pentane or heptane are non-polar molecules so both of the , dispersion or london force exists as intermolecular force exists among molecules of pentane or heptane . So these bonds needs to be broken and dispersion  interaction takes place between molecules of pentane and heptane. Dispersion interaction  of AB type is stronger than AA or BB type.

Mixing of nonpolar molecules pentane and heptane results in the breaking and forming of dispersion forces, which are intermolecular forces present in such hydrocarbons.

When pentane (C5H12) and heptane (C7H16) mix, the type of intermolecular forces that must be broken are dispersion forces. Both pentane and heptane are nonpolar molecules hence the only intermolecular forces present are the weak dispersion forces or London dispersion forces. These are the instantaneous dipole-induced dipole forces that result from transient shifts in electron density. The somewhat stronger intermolecular force among nonpolar hydrocarbons is basically due to larger electrong cloud, and the only type of 'attractive forces' available for them to form when they mix are still the same - dispersion forces

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Answer:

nitrogen

Explanation:

Answer:

Maryland is a Mid-Atlantic state in the United States that is characterized by abundant waterways and coastlines.

The effects of climate change in Maryland include rising sea levels, summer heat waves, and more frequent and violent thunderstorms.

These changes affect the citizens of Maryland, their livelihoods and also the economy of the state.

Answer:

pH=105

Explanation:

The higher the pH, the more alkaline it is.

Answer:

milk of magnesia, pH = 10.5

Explanation:

just got it right one edge

Answer:

Inflammation

Explanation:

Inflammation is the response to a cut. The blood vessels expand when you get cut to allow white blood cells to flock to the wound site. These attack any bacteria that got past the clot. If you mean excess bacteria, then that would be an infection.

The redness around a wound caused by harmful bacteria is due to inflammation, an immune response that involves blood vessel dilation, increased blood flow, and white blood cells combatting the infection.

When harmful bacteria invade a wound, the skin around the wound turns red due to a process called inflammation. This biological response is the body's second line of defense against pathogens. Inflammation is triggered by the release of chemicals when skin or other tissues are damaged. These chemicals cause blood vessels to dilate, increasing blood flow and making the area red and warm.

The influx of blood also delivers white blood cells like neutrophils to the wound site, and these cells help to combat the bacterial invaders. A well-known agent in this process is histamine, which not only contributes to the dilation of blood vessels but also helps attract immune cells to the site of injury. This inflammatory response helps to establish a physical barrier against the spread of infection and begins the process of tissue repair.

Answer:

Use stoichiometry to find your answers

Explanation:

Answer:

Temperature (T1) = 954.86 K or 681.86 ° C

Explanation:

Given:

Temperature (T) = 1000° C = 1000 + 273.15 = 1,273.15 K

Volume of the piston (V) = 20 L

Volume of the piston (V1) = 15 L

Find:

Temperature (T1) = ?

Computation:

⇒ [Temperature (T) / Volume of the piston (V)] = [Temperature (T1) / Volume of the piston (V1) ]

⇒ [1,273.15 K / 20 L] =  [Temperature (T1) / 15 L]

⇒ Temperature (T1) = 954.86 K or 681.86 ° C

Using Charles's Law, which relates gas volume and temperature, it is determined that when a gas-filled piston with an initial volume of 20 L at 1000°C compresses to 15 L, the outside temperature is approximately 204.28°C.

To determine the temperature outside when the piston has a volume of 15 L, we need to use Charles's Law, which states that the volume of a gas is directly proportional to its absolute temperature when the pressure is held constant. Mathematically, Charles's Law is expressed as V1/T1 = V2/T2, where V1 and T1 are the initial volume and temperature and V2 and T2 are the final volume and temperature. Given that at 1000°C (which is 1273.15 K), the volume of the piston is 20 L, we can find the outside temperature (T2) when the volume of the piston is 15 L by rearranging the formula to T2 = (V2×T1)/V1.

Let's calculate the outside temperature:

T2 = (15 L × 1273.15 K) / 20 L
T2 = 9548.625 K / 20
T2 = 477.43125 K

To convert this back to Celsius, we subtract 273.15 from the Kelvin temperature.

T2 (in °C) = 477.43125 K - 273.15
T2 (in °C) = 204.28°C

Therefore, the outside temperature is approximately 204.28°C when the piston has a volume of 15 L.

The presence of atom or molecules was proven already by scientific experiments by Rutherford, Dalton etc. There is no simple experiment by which we can prove that a substance is made of atoms. But we can observe it using Brownian motion.

There are various theories proposed by scientists regarding the structure and properties of atoms and they discovered the presence of sub-atomic particles electrons, protons and neutrons.

The presence of charged particles inside an atom is discovered by Rutherford using Gold-foil experiment. Similarly J.J Thomson discovered the electrons first.

Brownian motion is the random motion of particles which are suspended in a medium of liquid or gas. This motion is a proof of molecular vibration and thereby the presence of atoms or molecules.

By the immersing particle of inorganic matter in water we can observe the Brownian motion easily provided no external force is affected.

Therefore, in fact by these simple observations we can have a believe in atoms.

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Answer:

684 mmHg

Explanation:

A mixture of oxygen, hydrogen and water vapor has a total pressure of 684 mm Hg, then the partial pressure of water vapor is 228 mmHg.

Dalton's law of gases states that total pressure of the mixture of gases is equal to the sum of the partial pressure of each gases present there, i.e.

P = p₁ + p₂ + p₃, where

P = total pressure of gas = 684 mmHg

p₁ = partial pressure of oxygen = 380 mmHg

p₂ = partial pressure of hydrogen = 0.100 atm = 76 mmHg

p₃ = partial pressure of water vapor = ?

On putting values, we get

p₃ = 684 - (380 + 76)

p₃ = 228 mmHg

Hence required partial pressure of water vapor is 228 mmHg.

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