the one at the bottom^

There will be 0.39 moles

Take a look at the He gas in the tank:

P = 2.80 atm, or pressure

Volume = 5.00 liters.

T = (273 + 155) is the temperature. K = 428 K

R = 0.08206 L atm/L of gas (mol K)

Charle's law, Boyle's law, and Gay-Lussac law are the three gas laws that make up the combined gas law, commonly referred to as a general gas equation. For a certain amount of gas, the law illustrates the relationship between temperature, volume, and pressure.

Gas law PV = nRT

So, n = PV/. (RT)

He gasses number = 2.80 x 5.00 / (0.08206 x 428) mol equals 0.39 mol.

Learn more about Gas law here-

https://brainly.com/question/12667831

#SPJ9

When a 200°C iron bar is placed in thermal contact with a 30°C block of wood, energy leaves the iron bar and enters the wood until the temperatures are equal.

Law of conservation of energy states that the energy cannot be lost or formed but it can only be transformed from one form to another.

According to the given question, the block of wood is at a lower temperature than an iron bar. Hence, heat will flow from the iron bar to the block of wood until the temperatures of both are equal.

Know more about the Law of conservation of energy,

https://brainly.com/question/24772394

https://brainly.com/question/11549071

Limitations of using synthetic polymers are:

A synthetic polymers is defined as the material which is mainly made from polyester, teflon-like material or nylon.

Polypropylene is best example of synthetic polymers.

These polymers are not eco-friendly nor they are sustainable or green. They are type of non-biodegradable.

These synthetic polymers can be easily grouped into different big quantities. These are generally not very expensive.

Thus, we concluded that landfills can easily fill up with the synthetic polymers and they are not biodegradable are main limitations of using synthetic polymers.

learn more about synthetic polymers:

https://brainly.com/question/17555341

#SPJ4

Answer: D

D

Explanation:

The formula you provided calculates the percent change in pH based on the difference between the pH at 5 drops and the pH at 0 drops. Here's how you can use the formula:

1. Determine the pH at 5 drops and the pH at 0 drops.

Let's say the pH at 5 drops is 4 and the pH at 0 drops is 7.

2. Plug the values into the formula:

Percent Change of pH = 100% × (pH at 5 drops - pH at 0 drops) / pH at 0 drops

Percent Change of pH = 100% × (4 - 7) / 7

3. Calculate the numerator:

4 - 7 = -3

4. Calculate the denominator:

Percent Change of pH = 100% × (-3) / 7

5. Calculate the percent change:

Percent Change of pH = -300% / 7

Therefore, the percent change in pH from 0 drops to 5 drops is approximately -42.86%.

Answer:

71 graham formal.

Dont get mad if i am wrong 0-0

Explanation:

Answer:

I hope this helps you

.......................................

Answer:

All of the listed factors can affect the potency of a drug.

Explanation:

All of the listed factors can affect the potency of a drug. Let's discuss each one:

The amount: The potency of a drug can be influenced by the dosage or amount administered. Generally, a higher amount of a drug can lead to a greater effect or potency. However, there may be optimal dosage ranges where the potency is maximized before plateauing or potentially causing adverse effects.

Concentration: The concentration of a drug refers to the amount of the drug present in a given volume or solution. A higher concentration of a drug can increase its potency since a greater quantity of the active substance is available to interact with the target receptors or sites.

Number of exposures: The number of times a person is exposed to a drug can also impact its potency. In some cases, repeated exposures can lead to an accumulation of the drug in the body, resulting in increased potency or stronger effects. However, this can also lead to tolerance, where the body becomes less responsive to the drug over time, requiring higher doses for the same effect.

Exposure method: The way a drug is administered or exposed to the body can affect its potency. Different routes of administration (e.g., oral, intravenous, inhalation, topical) can result in variations in the drug's absorption, distribution, and metabolism, which can influence its potency and onset of action.

It's important to note that potency is different from efficacy, which refers to the maximum therapeutic effect a drug can produce. Potency specifically relates to the amount of drug required to produce a particular effect.

Answer:

The density is 11 g/cm^3

Explanation:

Density is mass divided by volume.

Answer:

Explanation:

Here, we want to get the constituent of an atom's mass

The constituent masses that contribute to the mass of an atom is the mass of the proton and the mass of a neutron

These two are situated in the nucleus of an atom which is the central part of the atom

The sum of the individual masses of each of the

The change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C

Heat transfer is defined as the process in which the molecules are moved from the region of higher temperature to lower temperature.

The heat transfer can be calculated by the formula

\(Q=m \times c \times \Delta T\)

Here, Q is the heat supplied to the system,

m is the mass of the system,

c is the specific heat capacity of the system and

Δ T is the change in temperature of the system.

Substituting the values in the equation

m = 150g

Q=500 Joules

\(\rm c_{p}\) = 4.18 J/gxC

500 = 150 * 4.18* Δ T

Δ T = 0.797 °C

Therefore the change in temperature of 150 grams of water when gains 500 Joules of energy is 0.797 °C .

To know more about Heat Transfer

https://brainly.com/question/13433948

#SPJ1

Answer:

Displacement reaction

100 mL of 2.0 M HNO3 is needed to neutralize 40.0 mL of 5.0 M NaOH.

To determine the volume of 2.0 M HNO3 needed to neutralize 40.0 mL of 5.0 M NaOH, we can use the concept of stoichiometry and the balanced chemical equation for the neutralization reaction between HNO3 and NaOH.

The balanced chemical equation for the reaction is:

HNO3 + NaOH → NaNO3 + H2O

From the balanced equation, we can see that the stoichiometric ratio between HNO3 and NaOH is 1:1. This means that 1 mole of HNO3 reacts with 1 mole of NaOH.

First, let's calculate the number of moles of NaOH in 40.0 mL of 5.0 M NaOH:

moles of NaOH = volume (in L) × concentration (in M)

moles of NaOH = 0.040 L × 5.0 M = 0.2 moles

Since the stoichiometry is 1:1, we know that 0.2 moles of HNO3 are required to neutralize 0.2 moles of NaOH.

Now, let's calculate the volume of 2.0 M HNO3 needed to provide 0.2 moles of HNO3:

volume of HNO3 = moles of HNO3 / concentration (in M)

volume of HNO3 = 0.2 moles / 2.0 M = 0.1 L or 100 mL

Therefore, 100 mL of 2.0 M HNO3 is needed to neutralize 40.0 mL of 5.0M NaOH.

It's important to note that during the neutralization reaction, the reaction goes to completion. However, in practice, it is recommended to add the acid slowly and carefully while continuously monitoring the pH to ensure complete neutralization and avoid over-titrating.

For more such questions on neutralize visit:

https://brainly.com/question/23008798

#SPJ8

Answer:

Percentage of carbon:

\( { \tt{ = \frac{24}{30} \times 100\%}} \\ = 80\%\)

Percentage of hydrogen:

\({ \tt{ = \frac{6}{30} \times 100\%} } \\ = 20\%\)

Explanation:

higher or lower energy, depending on the element

Answer:

B

Explanation:

Answer:

The answer is True

Explanation:

I got it right on my quiz, hope this helps!

Small particles of organic material are called detritus. Therefore, the correct option is option C among all the given options.

Detritus is a term used in ecology to describe organic stuff that comes from nearby terrestrial populations and falls into the soil or into bodies of water, including leaves as well as other plant parts, animal carcasses, waste products, as well as other organic trash.

Detritus is broken down by microorganisms (such bacteria or fungus), and so this microorganism-rich material would then be consumed by invertebrates, who are then consumed by vertebrates. Detritus serves as many freshwater streams' energy source rather than live plants. Small particles of organic material are called detritus.

Therefore, the correct option is option C.

To learn more about detritus, here:

https://brainly.com/question/4762960

#SPJ6

When measuring heat transfer, the sign of the delta T (ΔT) and the heat transfer (q) values is significant.

The negative sign indicates that the heat flow is in the opposite direction from the expected direction based on the given temperature gradient. When a negative sign is present in the delta T value or heat value, it implies that heat is being absorbed rather than being given off.  For example, when a substance absorbs heat, the temperature difference between the two regions decreases, resulting in a negative delta T value. When the surroundings absorb heat, the object's temperature drops, resulting in a negative heat value. The opposite is true for positive signs. When an object loses heat, its temperature drops, and the temperature difference between two regions increases, resulting in a positive delta T value. The heat transfer is said to be positive if heat is given off by the system to the surroundings. When heat flows from the surroundings to the system, the heat transfer is negative. The negative sign is significant since it shows that the energy flow is in the opposite direction from the expected direction based on the given temperature gradient.The amount of heat transferred by the system is proportional to the absolute value of the heat value and the delta T value.

for such more questions on heat

https://brainly.com/question/30738335

#SPJ8

Answer:

Explanation:

H

Mass percent can be calculated from the mass of solute in grams divided by the mass of solution multiplied by 100. The percent by mass of the solute in aqueous solution of 27.2 g  ethanol in 250 g of total solution 10.88 %.

Mass percentage is term used to represent the concentration of a solution. Mathematically mass percent of a component in a mixture is  the mass of the component divided by the total mass multiplied by 100.

A solution  is made of a solvent and solute. Thus, the total mass of the solution is the sum of mass of solute and mass of the solvent. Here, the solute is ethanol with a mass of 27.2 g. The total mass of solution is 250g.Hence, the mass percent of ethanol can be calculated as follows:

Mass percent of ethanol = mass of ethanol/total mass ×100

                                         =   (27.2/250)×100

                                         = 10.88 %.

Hence, the percent by mass of solute ethanol in the total solution is 10.88%.

To find more about mass percent, refer the link below:

https://brainly.com/question/5394922

#SPJ2

The chemical formula O₂ which is oxygen is a molecule as it is made up  of 2 oxygen atoms.

Chemical  formula is a way of representing the number of atoms present in a compound or molecule.It is written with the help of symbols  of elements. It also makes use of brackets and subscripts.

Subscripts are used to denote number of atoms of each element and brackets indicate presence of group of atoms. Chemical formula does not contain words. Chemical formula in the simplest form  is called empirical formula.

It is not the same as structural formula and does not have any information regarding structure.It does not provide any information regarding structure of molecule as obtained in structural formula.

Learn more about chemical formula,here:

https://brainly.com/question/29031056

#SPJ1

191.82 \(\frac{lbs}{D}\) calculate the stoichiometric dosage to neutralize 6.5 \(\frac{mg}{l}\)  parts per million of chlorine.

Assume a SO₂ residual of 6.5 \(\frac{mg}{l}\) to assure all of the chlorine is reacted.

Then, the feed rate of SO₂ is (6.5 \(\frac{mg}{l}\)) + (5.0 \(\frac{mg}{l}\)) = 11.5 \(\frac{mg}{l}\)

Feed rate in \(\frac{lbs}{day}\) = ( 2\(\frac{G}{D}\)) × (11.5) × (8.34 \(\frac{lbs}{G}\))

Feed rate of SO₂ in \(\frac{lbs}{day}\)  = 191.82 \(\frac{lbs}{D}\)

Simply put, what is stoichiometry?

Stoichiometry, a branch of chemistry, uses relationships between reactants and/or products of a chemical reaction to determine the quantitative data that is required. Since the Greek terms stoikhein and metron both mean element and measure, respectively, stoichiometry literally translates as the measure of elements.

A stoichiometric reaction is what exactly?

When all of the reactants are consumed and none are left behind after the chemical reaction is finished, this is referred to as a stoichiometric chemical reaction. For quantifying chemical reactions, such as those that take place in corrosion processes, stoichiometry is helpful.

To know more about Stoichiometry visit:

https://brainly.com/question/9743981

#SPJ4

Answer:

424 grams of sodium are contained in 4moles of na2co3

Answer:

A. The reaction shifts to the right (products) and the concentrations of I and H₂ decrease.

Explanation:

If gas is removed from the system at equilibrium, the system will try to compensate for the loss by shifting the reaction in a direction that produces more gas molecules. This is known as Le Chatelier's principle, which states that a system at equilibrium will respond to a disturbance by shifting in a way that minimizes the effect of the disturbance.

In this case, since gas is being removed from the system, the reaction will shift to the side that produces more gas molecules. Looking at the balanced equation, we can see that 2HI(g) has a greater number of gas molecules compared to H₂(g) and I₂(g). Therefore, the system will shift to the right (products) to produce more HI(g) and reestablish equilibrium.

The pOH of the 0.001 M NaOH solution is approximately 3.

To determine the pOH of a solution, we need to know the concentration of hydroxide ions (OH-) in the solution.

In the case of a 0.001 M NaOH solution, we can assume that all of the NaOH dissociates completely in water to form Na+ and OH- ions. Therefore, the concentration of hydroxide ions in the solution is also 0.001 M.

The pOH is calculated using the equation:

pOH = -log[OH-]

Substituting the concentration of hydroxide ions, we have:

pOH = -log(0.001)

Using a calculator, we can evaluate the logarithm:

pOH ≈ 3

Therefore, the pOH of the 0.001 M NaOH solution is approximately 3.

Know more about  hydroxide ions   here:

https://brainly.com/question/28464162

#SPJ8

The mass in grams of 4.60 x 10^23 atoms is approximately 9.17 g.

To find the mass in grams of 4.60 x 10^23 atoms, we need to consider the molar mass and Avogadro's number. Avogadro's number (6.022 x 10^23) represents the number of atoms or molecules in one mole of a substance.

First, we need to determine the molar mass of the substance in question. Let's assume we are dealing with a specific element, such as carbon (C), which has a molar mass of approximately 12.01 g/mol.

To calculate the mass in grams, we can use the following formula:

Mass (in grams) = (Number of atoms / Avogadro's number) x Molar mass

Substituting the given values:

Mass (in grams) = (4.60 x 10^23 atoms / 6.022 x 10^23) x 12.01 g/mol

Calculating the expression:

Mass (in grams) = (0.763 mol) x 12.01 g/mol

Mass (in grams) = 9.17 g

For such more questions on atoms

https://brainly.com/question/6258301

#SPJ8

The number one produced chemical in the United States is fertilizer ammonia.

What is a fertilizer?

A fertilizer is any natural or synthetic material that is applied to soil or plant tissues to supply plant nutrients. Fertilizers can be distinguished from liming materials or other non-nutritional soil amendments. There are numerous fertilizer sources, both natural and man-made.   Fertilization in most modern agricultural practices focuses on three main macronutrients: nitrogen (N), phosphorus (P), and potassium (K), with the occasional addition of micronutrient supplements such as rock dust. Farmers apply these fertilizers in a variety of ways, including using large agricultural equipment or hand-tool methods, and applying them dry, pelletized, or liquid.

Hence, the number one produced chemical in the United States is fertilizer ammonia.

To know more about fertilizer from the given link

https://brainly.com/question/24544067

#SPJ4

The dependent variable in this case is the length of the cattails while the independent variable is the volume of water received.

An experiment is a carefully controlled study which establishes a cause and effect relationship between variables. There must be a dependent variable and an independent variable.

The dependent variable in this case is the length of the cattails while the dependent variable is the volume of water received. The control group is the group that did not receive any water.

Learn more about experiment: https://brainly.com/question/9199868

✨Pleasee Like✨

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. The frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

The statement is correct. The photoelectric effect refers to the phenomenon where electrons are ejected from the surface of a material when it is exposed to light. However, for the photoelectric effect to occur, the frequency of the incident light must be above a certain threshold frequency.

The threshold frequency is the minimum frequency of light required to dislodge electrons from the material. Below this threshold frequency, regardless of the intensity or duration of the light, no electrons will be emitted.

This behavior can be explained by the particle-like nature of light, where light is composed of discrete packets of energy called photons. The energy of a photon is directly proportional to its frequency. Only photons with energy greater than or equal to the binding energy of the electrons in the material can dislodge them.

Therefore, the frequency of light striking an electron in a metal must be above the threshold frequency in order for the photoelectric effect to occur.

For more question on photoelectric

https://brainly.com/question/1458544

#SPJ8