Which of the following is an empirical formula ?

The molarity of the sodium chloride solution is 1.95 M.

The term molarity has to do with the concentration of  substance in mole per decimeter cubed. There are several units of concentration and in every case, there is always a given unit of concentration that is most apt to be used at that point.

Given that;

Mass of the sample = 42.5 g

Molar mass of NaCl = 58.5 g/mol

Volume of the solution = 375 ml or 0.375 L

Number of moles of NaCl = 42.5 g/58.5 g/mol = 0.73 moles

Molarity of the solution = 0.73 moles/0.375 L = 1.95 M

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Answer:

45 m/s north

Explanation:

Edge 2020

Answer: (B) 45 m/s north

Explanation: right on edge 2020 (so basically the same reason as person above)

The conjugate acid-base pairs are ( HF, F⁻) and ( H₂O, H₃O⁺ )

A conjugate acid-base pair, as defined by Bronsted-Lowry, consists of two compounds that are distinct only in that they contain a proton (H⁺). The addition of a proton to a base results in the formation of a conjugate acid, while the removal of a proton from an acid result in the formation of a conjugate base.

The reaction becomes:

HF + H₂O → H₃O⁺ + F⁻

The conjugate acid-base pairs are ( HF, F⁻) and ( H₂O, H₃O⁺ )

Here,

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Answer:

The Answer is gonna be Indroduction of non-native plant species

The molality of the solution is 1.89 mol/kg

Molality is defined as the number of moles of solute per kilogram of solvent. To calculate the molality of the aqueous sodium chloride solution, we need to first calculate the number of moles of sodium chloride in the solution, and then determine the mass of water in the solution.

The molar mass of sodium chloride (NaCl) is 58.44 g/mol. Therefore, the number of moles of NaCl in the solution is:

148 g / 58.44 g/mol = 2.53 mol

The mass of water in the solution is the total mass of the solution minus the mass of the solute:

Mass of water = Total mass of solution - Mass of NaCl

Mass of water = 1490 mL x 1 g/mL - 148 g

Mass of water = 1342 g

The mass of water in kilograms is:

Mass of water (kg) = 1342 g / 1000 g/kg = 1.342 kg

Therefore, the molality of the solution is:

Molality = 2.53 mol / 1.342 kg ≈ 1.89 mol/kg

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Answer:

25 km per hour

Explanation:

50/2=25

The dicotyledons, also known as dicots, are one of the two groups into which all the flowering plants or angiosperms were formerly divided. The name refers to one of the typical characteristics of the group, namely that the seed has two embryonic leaves or cotyledons.

When the reaction of  Grignard reagent reacted with methanol will yield a tertiary alcohol. Therefore, Option C tertiary alcohol is correct.

Contains a carbon-metal link, Grignard reagents are chemicals used in catalysis. They generally result from the anhydrous reaction of magnesium metal with an alkyl or aryl halide. Because of their high reactivity, Grignard reagents frequently act as nucleophiles in organic reactions.

An alkyl group from a Grignard reagent binds to the oxygen atom of methanol (CH3OH) when it interacts with the methanol, breaking the carbon-metal connection. A precursor alkoxide is created as a result. The equivalent alcohol is then produced by protonating the intermediate alkoxide.

The reaction of a Grignard reagent with methanol leads to the formation of a tertiary alcohol.

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Assuming a similar number of molecules, the matter that occupies the most space is gas. Option C is correct.

This is because gases have no definite shape or volume, and their molecules are spread out, moving freely in all directions. As a result, gases tend to occupy the entire volume of their container and expand to fill the available space. This is known as the "kinetic molecular theory" of gases.

In contrast, solids and liquids have a definite volume and shape. Solids have a fixed shape and their molecules are packed closely together, while liquids have a variable shape and their molecules are less closely packed. As a result, both solids and liquids occupy less space than gases.

It is worth noting that the volume of a solid or liquid can change under certain conditions, such as changes in temperature or pressure. However, even under these conditions, the space occupied by a solid or liquid is still less than that occupied by a gas. Option C is correct.

The complete question is

Which of the following matters occupies more space, assuming similar number of molecules?

A. Solid

B. Liquid

C. Gas

D. Solid and gas

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Answer:

The total number of protons and neutrons is the mass number of an atom.

Explanation:

The mass number is made up of the total protons and neutrons in an atom. The mass number represents the mass of the atom in amu (atomic mass units). Electrons are not included in this representation because their mass is negligible (practically 0). The atomic number is made up of the total protons in an atom.

Answer:

C

Explanation:

c.) temperature, wind patterns, ice cores

Answer:

Refraction

Explanation:

the change in direction of waves that occurs when waves travel from one medium to another. ... Diffraction is the bending of waves around obstacles and openings. The amount of diffraction increases with increasing wavelength

Answer:

A change in direction in a wave when it passes through an opening is called diffraction.

I hope this helps

Copper is higher than silver in the electrochemical series hence copper displaces silver in the electrochemical series.

The solubility of a metal in another is determined by their relative positions in the electrochemical series. The metals that are higher above in the electrochemical series displaces the metals that are lower in the electrochemical series.

Copper is higher than silver in the electrochemical series hence copper displaces silver in the electrochemical series. Therefore, the correct explanation for an observation is that;

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Answer:

Observation 1 is a result of copper ions moving into the solution.

Explanation:

got it right on the test

Answer:

Wind!

Explanation:

Answer:

H†(aq) + OH-(aq) ------> H2O(l)

Potassium Sulphate will be among the products, but since it's a solid at room temperature, it's excluded from the ionic equation

Answer:

(B)

Explanation:

edg 2020

The four seasons in earth is originating from the earth's revolution around the sun. Therefore, the most suitable model for Amanda is  Four earth models, each with a different tilt to represent the earth’s position relative to the sun, lined up in order of season.

Seasons in earth is originating from the difference in the distance from the sun over each time period. Hence, revolution of earth around sun make these seasons.

The time period at which earth comes closer to sun more hot will be earth's surface and we experience summer season. When we far from sun winter season occurs.

Therefore, different season are coming based on the distance of earth from sun at each revolution point. This is also affected by the tilt of earth's in its own axis.

Hence, different earth models with different distance from sun is most suitable model here for Amanda. Thus option B is correct.

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The electronic configuration 1s2,2s2,2p6,3s2  belongs to Magnesium.

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Answer:

VIDEO ANSWER: This question, we're starting with 2370 square inches, and we want to convert this to square centimeters.

Explanation:

.

The original volume of the concentrated solution was 182.7 mL.

To solve this problem, we can use the formula for dilution:

C1V1 = C2V2

Where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

We are given that the initial concentration (C1) is 2.3 M, the final concentration (C2) is 2.1 M, and the final volume (V2) is 191.8 mL. We want to find the initial volume (V1).

Plugging in the values we know into the dilution formula, we get:

(2.3 M) V1 = (2.1 M) (191.8 mL)

Simplifying this expression, we can solve for V1:

V1 = (2.1 M) (191.8 mL) / (2.3 M)

V1 = 182.7 mL

It's important to note that the units of concentration and volume must be consistent in this formula. In this case, the concentrations are given in units of M (moles per liter), and the volumes are given in units of mL (milliliters).

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Tthe initial temperature of the polystyrene sample is 39.4°C.

Given: Mass of polystyrene sample = 54.2 gSpecific heat of polystyrene = 1.880 J-g°CWater mass = 100.0 g Initial water temperature = 21.0°CWater final temperature = 34.3°CPressure remains constant at 1 atmFormula used:Heat gained by water = heat lost by polystyreneHence,Heat lost by polystyrene = Heat gained by water=> mcΔT = mcΔTwhere,m = mass of polystyrene or waterc = specific heat capacityΔT = change in temperatureThe temperature change is ΔT = 34.3°C - 21.0°C = 13.3°CNow we can use this temperature change to calculate the initial temperature of the polystyrene.Taking the water's specific heat capacity, c = 4.184 J/g°CHeat gained by water = (100.0 g)(4.184 J/g°C)(13.3°C) = 5574 JHeat lost by polystyrene = 5574 JTaking the polystyrene's specific heat capacity, c = 1.880 J/g° ) = 13.3°C Now let's calculate the mass of polystyrene using the specific heat capacity formula.5574 J = (54.2 g)(1.880 J/g°C)(13.3°C - Ti)Ti = 39.4°C

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The given question is incomplete, the complete question is:

A 10.0 L tank at 28.6 C is filled with 5.67 g of sulfur tetrafluoride gas and 4.66 g of carbon monoxide gas. You can assume both gases behave as ideal gases under these conditions. Calculate the total pressure in the tank. Round each of your answers to 3 significant digits.

Answer:

The correct answer is 0.541 atm.

Explanation:

Based on the given information, 5.67 grams of sulfur tetrafluoride gas and 4.66 grams of CO gas is filled in the tank having the capacity of 10 liters at 28.6 degree C or 273 + 28.6 = 301.6 K. The no. of moles can be determined by using the formula, n = weight/molecular mass.  

The moles of sulfur tetrafluoride = 5.67 grams / 108 gram per mole (The molecular mass of SF4 is 108 g/mol)

= 0.0525 moles

Similarly the moles of CO = 4.66 grams / 28 gram per mole (The molecular mass of CO is 28 g/mol)

= 0.166 moles

The sum of the moles = 0.0525 + 0.166 = 0.2185 moles

The total pressure can be calculated by using the formula,  

P = nRT/V

Here n is 0.2185 moles, R is 0.0821 L.atm/mol.K, T is 301.6 K and V is 10 Liters. Now putting the values we get,  

P = 0.2185 moles * 0.0821 L.atm/mol.K * 301.6 K / 10 L

P = 0.541 atm

Answer:

\(n=0.0747mol\)

Explanation:

Hello,

In this case, since we can consider hydrogen gas as an ideal gas, we check the volume-pressure-temperature-mole relationship by using the ideal gas equation:

\(PV=nRT\)

Whereas we are asked to compute the moles given the temperature in Kelvins, thr pressure in atm and volume in L as shown below:

\(n=\frac{105kPa*\frac{0.009869atm}{1kPa}*1.75L}{0.082\frac{atm*L}{mol*K}*(23+273.15)K} \\\\n=0.0747mol\)

Best regards.

The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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Answer:

\(HCN~~Ka=4.9x10^-^1^0\)

Explanation:

In this case, we have to remember the relationship between the Ka value and the pH. We can use the general reaction for any acid with his Ka value expression:

\(HA~->~H^+~+~A^-\)    \(Ka=\frac{[H^+][A^-]}{[HA]}\)

In the Ka expression, we have a proportional relationship between Ka and the concentration of \(H^+\). Therefore, if we have a higher Ka value we will have a smaller pH (lets keep in mind that with a higher

So, if we have to find the higher pH value we need to search the smaller Ka value in this case \(HCN~~Ka=4.9x10^-^1^0\).

I hope helps!

HCN has the highest pH among all the acids listed in the question.

The Ka is called the acid dissociation constant. It shows the extent to which an acid is ionized in water. The pH shows the hydrogen ion concentration of water. The higher the Ka, the higher the hydrogen ion concentration and the lower the pH.

Hence, HCN has the lowest Ka and the lowest hydrogen ion concentration. Therefore, HCN has the highest pH among all the acids listed in the question.

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The definitive word for each of the given sentences is as follows:

A microprocessor is a compact and integrated chip that contains the central processing unit (CPU) of a computer. Alan Turing was a British mathematician and computer scientist who played a crucial role in breaking the German Enigma code during World War II. A vacuum tube, also known as a valve, is an electronic component consisting of a glass or metal tube with electrodes sealed inside.

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Answer:

cpu , al , vaccum tube

Explanation:

100% on edge

Refer to the attachment.