Which of the following gas samples would contain the same amount of gas as 200 mL of helium, He(g), at 25° C and 1 atm?

Select one:
a. all the above
b. 200 mL of neon, Ne (g), at 25° C and 1 atm
c. 40 mL of methane, CH4 (g), at 25° C and 1 atm
d. 400 mL of hydrogen, H2 (g), at 25° C and 1 atm

Need done asap! Will give 5 stars!

The expanded volume of the gas can be find out using Boyle's law. The final volume of the gas is calculated as 1300 ml.

According to Boyle's law, at constant temperature, the volume of a gas is inversely proportional to the pressure of the gas. Thus the expression for this law can be written as :

PV = a constant.

If we have initial volume and pressure V₁ and P₁ respectively and the final volume and pressure V₂ and P₂ respectively, then the relation is:

P₁ V₁ = P₂  V₂.

It is given that the initial volume and pressure of gas are 725 ml and  0.970 atm. The final pressure is 0.541 atm. Then the final volume of the gas is calculated as follows:

V₂ = P₁ V₁ /  P₂

    = (0.970 atm × 725 ml) / 0.541 atm

    = 1300 ml.

Hence, the final volume of the gas is 1300 ml.

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Answer:

Im going to say sleep

Explanation:

Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.

Freezing-point depression is a drop in the temperature at which a substance freezes, caused when a smaller amount of another, non-volatile substance is added.

The freezing-point depression for a solution is 2. 5 °C. We can calculate the molality of the solution using the following expression.

ΔT = Kf × b

b = ΔT / Kf = 2.5 °C / (4.5 °C/m) = 0.56 m

where,

Given the freezing-point depression for a solution is 2. 5 °C and the cryoscopic constant is 4.5 °c/m, the molality of the solution is 0.56 m.

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The molality of a solution will be 0.56 m. if the freezing point depression for a solution is 2.5° C.

Molality is the measure of the moles of any solute in a solution per unit kg of the solvent.

Given, the freezing-point depression for a solution is 2. 5 °C

The kf is 4.5° c/m

\(\rm \Delta T = Kf \times b\\\\b = \dfrac{\Delta T}{kf} \\\\b = \dfrac{2.5^ \circ C}{4.5 \circ C/m} = 0.56 m\)

Where T is freezing point depression

kf is cryoscopic constant of the solvent

b is molality of the solution

Thus, the molality of the solution is 0.56 m.

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Theoretical yield refers to the largest quantity of product that could be produced from a reaction if the limiting reactant is fully transformed into product.

The amount of a product that results from a chemical reaction's full conversion of the limiting reactant is known as the theoretical yield. It is not the amount you will actually get from a reaction in the lab because it is the amount of product that would result from a perfect (theoretical yield) chemical reaction.

The amount of product that is produced in a chemical reaction is controlled by the limiting reactant, also known as the limiting reagent. Calculating the theoretical yield of a reaction requires knowing the limiting reactant.

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Fructose does not undergo hydrolysis because it is a monosaccharide (option c).

Monosaccharides are the simplest form of carbohydrates, consisting of a single sugar unit. Fructose is a monosaccharide and is commonly known as a fruit sugar. It is a hexose (option b), meaning it has six carbon atoms.

Hydrolysis is a chemical reaction that involves breaking down a compound by adding water molecules. However, monosaccharides like fructose do not undergo hydrolysis because they cannot be further broken down into simpler sugars through the addition of water.

They are already in their simplest form and do not require hydrolysis for digestion or utilization in the body.

On the other hand, disaccharides (option d) and polysaccharides (option e) are more complex carbohydrates composed of multiple sugar units.

They can undergo hydrolysis, where the chemical bonds between the sugar units are broken by the addition of water, resulting in the formation of monosaccharides.

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Converted Recipe for 10 ounces:

- 4 oz Chicken stock

- 8 oz Butter

- 24 oz Flour

- 20 oz Shrimp

Note: The conversion factor is based on the assumption that the density of the ingredients remains constant.

To convert the recipe to yield 10 ounces, we need to determine the conversion factor and apply it to each ingredient.

The conversion factor is calculated as follows:

Desired Yield / Original Yield

Conversion factor = 10 oz / 1.25 gal

Let's convert each ingredient:

1/2 gal Chicken stock:

Conversion factor = 10 oz / 1.25 gal = 8 oz/gal

Converted amount = (1/2 gal) * (8 oz/gal) = 4 oz

8 oz Butter:

No conversion is needed since the amount remains the same.

3 C Flour:

Conversion factor = 10 oz / 1.25 gal = 8 oz/gal

Converted amount = (3 C) * (8 oz/gal) = 24 oz

2.5 # Shrimp:

Conversion factor = 10 oz / 1.25 gal = 8 oz/gal

Converted amount = (2.5 #) * (8 oz/gal) = 20 oz

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Answer:

Here we were given the weight of Ca as 80g

and the atomic mass of carbon is 40u(molar mass)

using the formula

where w is weight and m is molar mass

80/40

=2

therefore, there are 2 moles in 80g of calcium

Answer:

The atomic mass or mass number of an element is the total number of protons and neutrons in the nucleus of the atom.

Explanation:

done

Answer:

mass number

nucleus of an atom

I love physic

Answer:

D

Excess solar radiation due to a missing magnetic field.

Explanation: Solar proton events (SPEs) are bursts of energetic protons accelerated by the Sun. They occur relatively rarely and can produce extremely high radiation levels. Without thick shielding, SPEs are sufficiently strong to cause acute radiation poisoning and death.

Hope this hels

plz mark brainliest

The chair structure I has the trans confirmation and the chair structure II has the cis confirmation.

A particular structure can have two isomers, namely, the cis and the trans isomers. The confirmation is said to be cis confirmation when both the substituents are facing in same axial or equatorial plane. The confirmation is said to be trans when both the substituents are facing in the opposite planes.

In the structure I, we can see that both the groups are facing in the opposite planes and hence the structure must have a trans confirmation. In structure two, the groups are in the same plane and hence the confirmation is a cis confirmation.

Hence, the correct option is  c. I = trans; II = cis.

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Answer:

1×10^-14 mol^2dm^-6

Explanation:

Ionic product is defined as the product of the concentrations of ions, each raised to the power specified by its stoichiometric coefficient in a solution. The product of concentrations of H+ and OH- ions in water at a particular temperature is known as ionic product of water. The value of Kw increases with the increase of temperature, i.e., the concentration of H+ and OH- ions increases with increase in temperature. The value of Kw at 25°C is 1 x 10-14.

At any given time, the amount of hydrogen ions and hydroxide ions present in water is extremely small and consequently the concentration of undissociated water molecules is almost unchanged by any minute ionization thus it is considered a constant. The product of the concentration of both hydrogen and hydroxide ions is a constant referred to as the ionic product for water.

Answer:

About 0.151 M.

Explanation:

Because 32.20 mL of 0.250 M NaOH was used, determine the number of moles of NaOH consumed:
\(\displaystyle 32.20\text{ mL} \cdot \frac{0.250\text{ mol NaOH}}{1\text{L}} \cdot \frac{1\text{ L}}{1000\text{ mL}} = 0.00805\text{ mol NaOH}\)

Find the number of moles of sulfuric acid reacted with using reaction stoichiometry:

\(\displaystyle 0.00805\text{ mol NaOH} \cdot \frac{1\text{ mol H$_2$SO$_4$}}{2\text{ mol NaOH}} = 0.00402\text{ mol H$_2$SO$_4$}\)

Therefore, the molarity of the original sulfuric acid solution is:
\(\displaystyle \ [\text{H$_2$SO$_4$}] = \frac{0.00402\text{ mol}}{26.60\text{ mL}} \cdot \frac{1000\text{ mL}}{1\text{ L}} = 0.151\text{ M}\)

In conclusion, the molarity of the original sulfuric acid solution was about 0.151 M.

Tree species increased while small plant species decreased.

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The statement that is FALSE about VSEPR is "When electrons are not shared equally, it causes the molecule to bend"

Option C

VSEPR theory does not imply that unequal sharing of electrons causes a molecule to bend.

Rather, it is the repulsion between electron pairs, whether they are bonding or non-bonding, that determines the molecular geometry.

The VSEPR theory is based on the idea that valence electron pairs in the outermost shell of an atom repel each other, and the resulting repulsion determines the geometry of the molecule.

Therefore, Option C is false about VSEPR.

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The correct answer is option B i.e. It is not possible for a ligand to bond with more than one atom to a metal.

The incorrect statement about ligands among the given options is B) It is not possible for a ligand to bond with more than one atom to a metal. This statement is false because there are ligands, like chelating ligands, that can bond with multiple atoms to a metal.

In coordination chemistry, ligands are molecules or ions that can donate one or more pairs of electrons to form a coordinate bond with a central metal ion. Ligands can bond with the metal ion through multiple donor sites, forming coordination complexes. This allows for the formation of multiple bonds between the ligand and the metal ion.

Option B states that it is not possible for a ligand to bond with more than one atom to a metal, which is incorrect. In fact, many ligands can form multiple bonds with the metal ion, resulting in coordination numbers greater than one. For example, chelating ligands (as mentioned in option A) can form multiple bonds with the metal ion by donating two or more pairs of electrons from different atoms in the same ligand molecule.

Therefore, the correct statement is that ligands can bond with more than one atom to a metal, and option B is incorrect.

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Answer:

0J

Explanation:

Work = Force * Distance

Since the distance (or the displacement) in this problem is 0, hence, no work is done. W = 150*0 = 0. The mass of the object is just trying to trick you. Hopes this helps!

The number of moles of NaF that will be produced from 3moles of Na is 3 moles.

Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).

According to this question, sodium reacts with fluorine as follows:

2Na+ F₂ → 2NaF

Based on the above equation, 2 moles of Na will produce 2 moles of NaF

This means that 3 moles of Na will produce 3 moles of NaF.

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Answer:

The 3rd option is correct

Explanation:

The element in group 13 and period 3 is aluminium which has the electron configuration

\(1{s}^{2} 2 {s}^{2} 2 {p}^{6} 3 {s}^{2} 3 {p}^{1} \)

or [Ne] 3s^2 3p^1

Answer:

The process to use this knowledge is explained as below:

Explanation:

1. Farmer should use an indicator to check the pH value of the soil of the field of the farm.

2. If the field or the farm has alkali soil add acid to reduce the pH value.

3. If the soil of the farm is acidic for the crop add alkali to increase the pH value.

4. It will be a neutralization reaction and changes the pH value of the farm.

5. Weather/leeching into the surrounding soil/plant or animal waste will lead to a change in pH value over time.

6. The pH value will need to be regularly monitored and adjusted.

A strong acid has a relatively WEAK conjugate base that forms readily and is therefore MORE stable than the conjugate base of a weak acid.

A strong acid has a relatively weak conjugate base that forms readily and is therefore more stable than the conjugate base of a weak acid. Anything that increases the stability of a conjugate base makes the starting acid more acidic.

Strong acids have quickly forming, relatively weak conjugate bases that are more stable than the conjugate bases of weak acids. The initial acid becomes more acidic as a conjugate base's stability is increased.

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Answer:

59.46 g

Explanation:

To answer this question, the molecular weight of ammonium sulfate must be computed.  To accomplish this, the weights of the individual elements must be noted.
N=14.01\(\frac{g}{mol}\)

H=1.01\(\frac{g}{mol}\)

S=32.07\(\frac{g}{mol}\)

O=16.00\(\frac{g}{mol}\)

To compute the molecular weight:

\(2[14.01\frac{g}{mol}+4(1.01\frac{g}{mol})]+32.07\frac{g}{mol}+4(16.00\frac{g}{mol})=132.14\frac{g}{mol}\)

To calculate the mass:

\(0.45 mol(\frac{132.14g}{1mol})=59.463g\)

Cooking, water boiling, and heat from fire are examples of heat transfer.

Heat transfer refers to the movement of thermal energy or heat from one body or substance to another through conduction, radiation, or convection. Cooking, boiling water, and heat from fire are examples of heat transfer. The process of cooking involves the transfer of heat from a heat source (gas stove, electric stove, fire) to food through conduction.

As the heat is transferred from the source to the pot, it heats the water and food in the pot causing them to cook. Water boiling is also a result of heat transfer. When heat is applied to a pot of water, it heats up the water molecules, causing them to move more quickly. As the temperature of the water reaches its boiling point, the water molecules start to change into steam, and the water starts to boil.

Heat from fire is also an example of heat transfer. When wood or other fuels are burned, they produce heat. The heat energy produced from the burning fuel is then transferred to the surrounding air, causing the temperature to increase and allowing us to stay warm.

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Each water molecule is joined to Four other water molecules by Hydrogen bonds

As can be seen in the illustration on page 1 of the activity titled "The Polarity of Water" a water molecule is joined to four other water molecules by hydrogen bonds.

A hydrogen bond is an attraction between an electronegative atom carrying a single pair of electrons—the hydrogen bond acceptor—and a hydrogen atom that is covalently bonded to a more electronegative "donor" atom or group.

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Answer:

Gas

Explanation:

The atoms, ions, or molecules that make up the gas are further apart and move freely at high speeds and is can easily be compressible.

Answer:

Gas

Explanation:

A gas is a substance or matter in a state in which it will expand freely to fill the whole of a container' having no shape like a solid and no fixed volume like a liquid.

Answer:

C

Explanation:

cause i'm smart

Answer:

D

Explanation:

Because it says tree roots breaking rocks into smaller rocks.

Hope this helped!

Answer:

something that is impossible