Determine the mass of ammonium chloride, NH4Cl, required to prepare 0. 250 L of a 0. 35 M solution of ammonium chloride.

Answer:

14g

Explanation:

The empirical formula of the compound is CH₂ ;

When we are dealing with compounds the gram formula mass or gram - molecular weight is the molar mass of the compound.

It is determined by adding the atomic masses of the components together and then expressed in grams.

 Atomic mass of C  = 12

 Atomic mass of H  = 1

  Gram formula mass = 12 + 2(1)  = 14g

Given parameters:

Density of the rock = 2.2g/cm³

Volume of rock = 66.5mL

Unknown:

Mass of the rock = ?

Solution:

Density is the mass per unit volume of a body. It is mathematically expressed as shown below;

          Density  = \(\frac{mass}{volume}\)

So;

         Mass = Density x Volume

We need to take the given parameters to the same unit before we solve;

              convert mL to cm³

                 1mL  = 1cm³;  66.5mL is the same as 66.5cm³

Now solve;

          Mass  = 2.2 x 66.5  = 146.3g

The mass of the rock is 146.3g

The process that keeps ocean water levels from dropping is called A. evaporation.

The physical phenomenon of evaporation can be defined as the passage of a given compound from a liquid state to a gaseous state which in the case of water is represented by vapor water that condenses and falls into the oceans as precipitation.

Therefore, with this data, we can see that the physical phenomenon of evaporation is able to decrease the level of water in the ocean and this process is directly associated with subsequent precipitation.

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Answer:

37.84 Liters

Explanation:

(see picture)

Answer: C) 112g of Fe contains the largest number of atoms.

Explanation: When you convert the grams of the elements in the question to the number of particles in 1 mole from there you would be able to determine which choice actually contains more number of atoms than the rest.

You first divide the grams given to you by the atomic mass and then multiply that number by Avogadro's number which is 6.022 x 10^23. As shown in the image.

The percent yield of the reaction above in the plant is 100%.

To calculate the percent yield, we need to compare the actual yield to the theoretical yield.

Given:

Actual yield of nitrogen dioxide = 1,500 kg per day

Theoretical yield of nitrogen dioxide = 1,500 kg per day

The actual yield is the measured or obtained amount of nitrogen dioxide produced, while the theoretical yield is the maximum amount that could be produced based on stoichiometry and other factors.

Using the formula for percent yield:

Percent yield = (Actual yield / Theoretical yield) * 100

Substituting the given values:

Percent yield = (1,500 kg / 1,500 kg) * 100 = 100%

Therefore, the percent yield is 100%. This indicates that the actual yield of nitrogen dioxide obtained is equal to the theoretical yield, meaning that all the nitrogen oxide is being successfully converted into nitrogen dioxide without any loss or inefficiency in the reaction.

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The influx of Na+ ions to the interior of the cell leads to polarization and the efflux of K+ ions to the exterior of the cell leads to repolarization.

During an action potential in a neuron, there is a sequential change in the movement of ions across the cell membrane. The depolarization phase is initiated by the opening of voltage-gated Na+ channels, allowing Na+ ions to enter the cell. This influx of positive ions depolarizes the cell membrane, making the interior more positive.

As the depolarization phase continues, voltage-gated K+ channels open, allowing K+ ions to leave the cell. The efflux of K+ ions leads to repolarization, restoring the negative charge inside the cell.

So, the influx of Na+ ions to the interior of the cell leads to polarization, and the efflux of K+ ions to the exterior of the cell leads to repolarization.

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Answer:

Explanation:

Precipitation, evaporation, freezing and melting and condensation are all part of the hydrological cycle - a never-ending global process of water circulation from clouds to land, to the ocean, and back to the clouds.

Answer:Precipitation

Explanation:

Answer:

So I don't know what do you mean by that, please be a little specific.

Explanation:

^^

The molarity of the base used in the experiment, which was determined based on the recovered NaCl and the volumes of hydrochloric acid and sodium hydroxide, was approximately 1.15 M.

To determine the molarity of the base used in the experiment, we need to use the stoichiometry of the balanced chemical equation and the given data.

The balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH) is:

HCl + NaOH → NaCl + H2O

First, we need to find the number of moles of NaCl produced. We can do this by using the given mass of NaCl (2.22 g) and its molar mass (58.44 g/mol):

moles of NaCl = mass of NaCl / molar mass of NaCl

moles of NaCl = 2.22 g / 58.44 g/mol

moles of NaCl = 0.038 moles

Next, we can use the stoichiometry of the balanced equation to determine the number of moles of NaOH that reacted. Since the mole ratio between NaCl and NaOH is 1:1, the number of moles of NaOH is also 0.038 moles.

Now, we can calculate the molarity of the base (sodium hydroxide) using the given volume of sodium hydroxide solution (0.033 L):

Molarity of NaOH = moles of NaOH / volume of NaOH solution

Molarity of NaOH = 0.038 moles / 0.033 L

Molarity of NaOH ≈ 1.15 M

Therefore, the molarity of the base used in the experiment is approximately 1.15 M.

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One technique that can be used to determine the molecular formula of a compound is elemental analysis. This involves burning the compound in the presence of oxygen to convert all of its carbon, hydrogen, and nitrogen atoms into their respective oxides.

The amounts of these oxides can then be measured and used to calculate the number of each element present in the original compound. From this information, the empirical formula of the compound can be determined. Mass spectrometry can then be used to determine the molecular weight of the compound. Combining this information with the empirical formula allows for the determination of the molecular formula of the compound.

Other techniques such as nuclear magnetic resonance (NMR) and infrared spectroscopy (IR) can also aid in the determination of molecular structure. To determine the molecular formula of a compound, you can use a technique called mass spectrometry. This analytical method measures the mass-to-charge ratio of ions, allowing you to identify the compound's molecular weight and elemental composition. With this information, you can calculate the empirical formula and use it along with the molecular weight to find the molecular formula. Mass spectrometry provides accurate results and helps in identifying unknown compounds or verifying the composition of known substances.

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Answer:

A.

Explanation:

Miners were happy due to the result of the gold rush. they labored very hard for very little profit. Working in the Yukon Territory was not safe. To reach it, the ground had to be dug. Then the dirt had to be removed to get the gold.

In paragraph 2, what does the phrase "miners of all shapes and sizes" mean that many people were invited. This included food, clothing, transportation equipment, etc.

Answer:

I have no idea

Explanation:

The empirical formula, which represents the simplest ratio of atoms in a compound, may be useful in the lab setting but not useful for predicting the properties and functions of materials.

In the lab, the empirical formula can be useful for identifying the composition of a compound, especially if the molecular formula is unknown. It can also help in determining the stoichiometry of a reaction, which can be important for conducting experiments. However, the empirical formula does not provide information about the actual number of atoms or the arrangement of atoms within a molecule, which can greatly affect the properties and functions of a material.

Therefore, while the empirical formula can be a useful tool in the lab setting, it may not be sufficient for predicting the properties and functions of materials. More detailed information about the molecular formula and structure is needed for accurate predictions.

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Answer: A

Explanation:

 heat always passes from a warmer object to a cooler object until all objects are the same temperature. Conduction is how heat travels between objects that are touching. Conduction travels fastest through solids, but liquids and gases can also conduct heat.

The energy resource that causes the greatest waste disposal concerns is nuclear energy. Nuclear energy is a non-renewable resource that is produced by the splitting of atoms in a process called fission. When the atom is split, energy is released in the form of heat, which is then used to generate electricity.

Nuclear energy is one of the most efficient sources of energy, but it comes with significant environmental risks. The major concern associated with nuclear energy is radioactive waste. Radioactive waste is generated during the nuclear power generation process. The waste produced by nuclear power plants is radioactive and extremely hazardous. It can remain radioactive for thousands of years. This is why nuclear waste has to be carefully handled and stored to prevent it from contaminating the environment. The process of storing nuclear waste is costly, and it is also difficult to find a suitable location for storage. Additionally, nuclear energy is highly regulated, and any accidents or incidents can have significant environmental and health consequences.

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Answer:

Hey Man I dont know the Answer Im really sorry

Explanation:

I took the test though

There are total three laws of newtons, first law of newtons, second law of newton and third law of newton. Therefore, for every action there is an equal and opposite reaction.

Newton's first law is also called law of inertia. An object at rest remains at rest, and an object in motion remains in motion at constant speed and in a straight line unless acted on by an unbalanced force.

Third law of newton states  that for every action there is an equal and opposite reaction.

Therefore, for every action there is an equal and opposite reaction.

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Examples of polygenic traits are height, hair color, skin ,eye color and hair colors.

Polygenic traits are controlled by multiple genes instead of just one. The genes that control them may be located near each other or even on separate chromosomes. Because multiple genes are involved, polygenic traits do not follow Mendel's pattern of inheritance. Human phenotypes are polygenic traits. polygenic trait is influenced by many genes that work together to produce the phenotype.  Hair color is largely determined by the type and quantity of a pigment called melanin which is produced by a specialized cell type within the skin called melanocytes. The quantity and ratio of melanin pigments determine black, brown, blond, and red hair colors. these are polygenic traits.

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Answer:

its D. potassium and chromium

Answer:

option d

Explanation:

potassium and chromium

Answer:

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.0086

Explanation:

Mole fraction remains a sort of concentration. It indicates:

moles of solute / (moles of solute + moles of solvent)

Moles of solute / Total moles.

Solute: Cypermethrin → C₂₂H₁₉Cl₂NO₃

Solvent: Water (PM = 18g/mol)

We calculate moles from solvent: 1000g /18 g/mol = 55.5 moles

We calculate PM for C₂₂H₁₉Cl₂NO₃

12g/mol . 22 + 1g/mol . 19 + 35.45 g/mol . 2+ 14g/mol + 16g/mol . 3 = 416 g/m

Moles of solute: 200 g / 416g/mol = 0.481 moles

Total moles: 0.481 + 55.5 = 55.98 moles

Mole fraction for C₂₂H₁₉Cl₂NO₃ = 0.481 moles / 55.98 moles = 0.0086

There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

Thus, Only the hard bones or shells are left behind when soft tissues degrade, yet in some cases an organism's soft tissues can be retained and animals.

More sediment, volcanic ash, or lava may accumulate over the organism after it has been buried, and eventually all the layers harden into rock.

These once-living organisms are only revealed to us from within the stones when the process of erosion takes place, when the rocks are worn back down and washed away and fossil.

Thus, There are numerous ways that fossils can form, but the majority occur when a living thing—such as a plant or animal—dies and is swiftly buried by sediment—such as mud, sand, or volcanic ash and rock.

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The empirical formula of the compound is C1O1Cl5, which can be simplified to Cl5CO.

Given that the compound contains 12.12% carbon, 16.17% oxygen, and 71.71% chlorine, we can assume a 100 g sample of the compound. This means we have 12.12 g carbon, 16.17 g oxygen, and 71.71 g chlorine.

Next, we need to convert the mass of each element to moles by dividing it by its molar mass. The molar masses of carbon, oxygen, and chlorine are 12.01 g/mol, 16.00 g/mol, and 35.45 g/mol, respectively.

Number of moles of carbon = 12.12 g / 12.01 g/mol

Number of moles of oxygen = 16.17 g / 16.00 g/mol

Number of moles of chlorine = 71.71 g / 35.45 g/mol

To find the simplest whole-number ratio, we divide the number of moles of each element by the smallest number of moles obtained. In this case, the smallest number of moles is the number of moles of carbon.

Dividing the moles by the smallest number of moles, we get approximately 1:1:5 for carbon, oxygen, and chlorine, respectively.

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The value of ΔG at 298 K for a reaction mixture containing 1.9 atm N2, 1.6 atm H2, and 0.65 atm, the answer is (a) -3.86 × 10^3.

NH3 can be calculated using the equation:

ΔG = ΔG° + RT ln(Q)

where ΔG is the standard Gibbs free energy change, ΔG° is the standard Gibbs free energy change at standard conditions, R is the gas constant, T is the temperature in Kelvin, and Q is the reaction quotient.

In this case, we are given ΔG° as -33.3 kJ/mol. To calculate Q, we need to use the partial pressures of the gases in the reaction mixture. The reaction stoichiometry tells us that the ratio of the partial pressures of N2, H2, and NH3 is 1:3:2. Therefore, we can write:

Q = (P(NH3))^2 / (P(N2) * P(H2)^3)

Plugging in the given values of P(N2) = 1.9 atm, P(H2) = 1.6 atm, and P(NH3) = 0.65 atm, we can calculate Q. Then, using the value of R = 8.314 J/(mol·K) and the temperature T = 298 K, we can substitute these values into the equation and solve for ΔG.

The calculated value of ΔG at 298 K for the given reaction mixture is approximately -3.86 × 10^3 J/mol. This value is equivalent to -3.86 kJ/mol. Therefore, the answer is (a) -3.86 × 10^3.

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Answer:

Explanation:

a) v=w*lambda

wavelength=5/2.5

wavelength=2m

b)342/320=1.06875m

c)342/1.5=228 Hz

d)4.6153=v/wave

Answer:

Matter is made up of particles that are in constant motion and have energy

Explanation: