you need to prepare 250.0 ml of a 0.100 m aqueous solution using a pure solid with a molar mass of 278.5 g/mol. how many grams of solid should you use to make this solution?

sorry I don't know 4one

i HOPE IT'S HELP

The percentage of sugar in the solution is 1%

To solve this question, we need to find the percentage of 6 out of 600.

Data given;

This is the rate or proportion of a substance in the total value and multiplied by 100.

The percentage of sugar in the solution is calculated by

\(\frac{6}{600} * 100 = 1 % \)

The percentage of sugar in the solution is 1%

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The correct statement is a. At low temperatures, intermolecular forces become important and the pressure of a gas will be lower than predicted by the ideal gas law.

The ideal gas law assumes that gas particles have no volume and do not interact with each other, which is not completely true for real gases. At low temperatures, the gas particles move more slowly and are closer together, making intermolecular forces, such as van der Waals forces, more significant. These forces cause the gas particles to attract each other, reducing the effective number of particles and lowering the pressure. Statements b, c, and d are false. At a given temperature, lighter gas particles travel faster than heavier particles, not more slowly (statement b). The average kinetic energy of a gas sample increases with temperature, not decreases (statement c). At high pressures, the volume of individual gas particles becomes significant and cannot be neglected (statement d).

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Answer:

To obtain crystals of potassium chloride from the solution, you can follow the following steps:

1. Heat the solution to evaporate some of the water and concentrate the solution.

2. Continue heating the solution until crystals start to form at the bottom of the container.

3. Remove the container from heat and allow it to cool down to room temperature.

4. Once the solution has cooled, you can use a filter paper and funnel to filter out the crystals from the remaining solution.

5. Wash the crystals with a small amount of cold distilled water to remove any impurities.

6. Dry the crystals by placing them on a watch glass or filter paper in a warm place until all the water has evaporated.

By following these steps, you should be able to obtain pure crystals of potassium chloride from the solution.

Answer:

407.7c

Explanation:

200.0C = 0.325 atm

400.0C = 0.650 atm

407.7C = 0.675 atm

A sample of neon gas at 200.0C has a pressure of 0.325 atm.  The temperature is 407.7 C is by the pressure reaches 0.675 atm.

There are three basis gas laws which relates the pressure, temperature, and volume of the gas.

The temperature and pressure increase is given this.

200.0C = 0.325 atm

400.0C = 0.650 atm

407.7C = 0.675 atm

Thus, the correct option is 407.7C = 0.675 atm.

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Yes, the sea is considered a buffer.

A buffer is a solution that resists pH changes when acids or bases are added. The buffering capacity of the ocean allows it to maintain a relatively stable pH even when acids and bases are added.

The ocean's buffering capacity is primarily due to the presence of dissolved compounds such as bicarbonate (HCO3-) and carbonate (CO32-). These compounds act as both weak acids and bases, accepting and releasing hydrogen ions (H+) to maintain pH balance. When carbon dioxide (CO2) in the atmosphere dissolves in seawater, carbonic acid (H2CO3) is produced and decomposed into bicarbonate ions and hydrogen ions.

This transformation helps prevent a rapid drop in pH as excess hydrogen ions combine with carbonate ions to form bicarbonate ions, which can reduce overall acidity.

When alkali such as hydroxide ions (OH-) is added to the ocean, excess hydroxide ions combine with hydrogen ions to form water molecules, reducing alkalinity.

The presence of these dissolved compounds and their interconversion reactions stabilize the pH of the ocean, making it less susceptible to rapid changes in acidity or alkalinity. This buffering capacity is essential for the survival and maintenance of marine life, as many organisms are sensitive to changes in pH.

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Answer:

The SI base unit for amount of substance is the mole. 1 mole is equal to 1 moles N2, or 28.0134 grams.

Explanation:

:)

Answer:

its D

Explanation:

A and C are ruled out because an opnion of scientist doesnt make the a law and B is not always true

The side mirrors play an important role in providing the safety of a car and also help the drivers to see the vehicles behind the car. Most of the side mirrors have a small heating element in them which helps to defrost or deice.

When ice, snow or even just condensation builds up on your mirror, it can severely limit your visibility. The frost makes the smooth surface of the mirror rough, so that the parallel rays are reflected in different directions.

There are extensive and multiple refractions which cause the distortion of light and so that the frost looks white, whereas ice is clear also called black ice due to the colour of road surface.

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Answer:

Only London Dispersion Forces

Explanation:

Usually all molecules have LDF. Since this compound only consists of carbon and hydrogen it can't participate in dipole-dipole or hydrogen bonding since there's no polarity present in this molecule.

Propane molecules can interact with other like molecules through London dispersion forces and van der Waals forces, including dipole-dipole interactions. These intermolecular forces occur due to temporary fluctuations in electron distribution and partial charges.

CH3CH2CH3, also known as propane, can interact with other like molecules through London dispersion forces. These forces are the weakest intermolecular forces and occur between all molecules, regardless of polarity. They are caused by temporary fluctuations in electron distribution, resulting in temporary dipoles. Propane molecules can also interact through van der Waals forces, which include both London dispersion forces and dipole-dipole interactions. Dipole-dipole interactions occur when two polar molecules align their partial positive and partial negative charges.

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Answer:

A. Mixture

Explanation:

Answer:

Explanation:

The volume of a substance when given the density and mass can be found by using the formula

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

From the question

mass = 13 g

density = 19.3 g/cm³

We have

\(volume = \frac{13}{19.3} \\ = 0.673575...\)

We have the final answer as

Hope this helps you

Step 1

a. Please look at the next drawing:

First compound: C2H4

H = enthalphy = energy

H(C2H4) = H(C=C) + 4 x H(C-H) = 358 + 4 x 413 = 2010

------

Second compound: F2

H(F-F) = 154

------

Third compound: C2H4F2

H(C2H4F2) = 2 x H(C-F) + 4 x H(C-H) + H(C-C) = 2 x 485 + 4 x 413 + 495 = 3117

Therefore, ΔH = H products - H reactants = 3117 - (2010 + 154) = 953

Answer: ΔH = 953

the number of moles of air in a 4.0 L bottle at 19 °C and 747 mmHg is approximately 0.16 moles.

The ideal gas law equation is expressed mathematically as PV=nRT.

The ideal gas law equation relates the volume, pressure, number of moles, and temperature of an ideal gas. Given the volume of the air (4.0 L), the pressure (747 mmHg), and the temperature (19 °C), the number of moles of air in the 4.0 L bottle can be calculated as follows:

1. Convert the temperature from Celsius to Kelvin:

T(K) = T(°C) + 273.15 = 19 °C + 273.15 = 292.15 K2.

Convert the pressure from mmHg to atm:

747 mmHg × (1 atm / 760 mmHg) = 0.9816 atm3.

Calculate the number of moles of air using the ideal gas law equation:

n = PV/RT = (0.9816 atm × 4.0 L) / (0.08206 L·atm/K·mol × 292.15 K) ≈ 0.16 moles

Therefore, the number of moles of air in a 4.0 L bottle at 19 °C and 747 mmHg is approximately 0.16 moles.

Answer: The correct option is A) 0.5 moles.

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Answer:

chlorine atom

Explanation:

If sodium metal and chlorine gas mix under the right conditions, they will form salt. The sodium loses an electron, and the chlorine gains that electron. This reaction is highly favorable because of the electrostatic attraction between the particles. In the process, a great amount of light and heat is released

Hope it's not too late!

Answer:

4.54 * 10^-14 m

Explanation:

From Heisenberg's uncertainty principle, we can write;

Δp.Δx ≥ h/4π

Given that;

Δp =Δmv

So;

Δmv.Δx ≥h/4π

Δmv =2/100(3.5×10^7 m/s * 1.66 * 10^-27)

Δmv =1.162 * 10^-21 Kgms-1

Δx ≥6.63 * 10^-34 /4 * 3.142 * 1.162 * 10^-21

Δx ≥4.54 * 10^-14 m

Answer:

The Flux N_B = 0

Explanation:

So, we are given the following set of data or parameters which is going to help in solving this particular Question. So, let us take each at a time;

=> "An ammonia (A)-water (B) solution at 278 K and 4.0 mm thick is in contact at one surface with an organic liquid at this interface."

=>" 2.0 wt 'Yo ammonia (density of aqueous solution is 991.7 kg/m3) and the concentration of ammonia in water at the other end of the film 4.0 mm away is 10 wt % (density of 961.7 kg/m3). ''

With the information above, we can determine the N_A(which the question did not specify that we should calculate).

For the value of N_B, it will be equals to zero(0) because the insolubility of water in organic solvent.

Answer:

46.2 L

Explanation:

The equation of the reaction between sulphur and oxygen;

S(s) + O2(g) ------> SO2(g)

Number of moles of oxygen reacted = 255g/32 g/mol = 7.97 moles

Now;

If 1 mole of oxygen reacts with 1 mole of sulphur

7.97 moles of oxygen will also react with 7.97 moles of sulphur

From the ideal gas equation;

PV = nRT

P = 4 atm

T = 283 K

n= 7.97

V= ?

R= 0.082 atm LK-1mol-1

V = nRT/P

V= 7.97 * 0.082 * 283/4

V = 46.2 L

Henderson's Hasselbalch equation for the propanoic acid

\(solution \: is \: pH=4.874 + log \frac{[A ^{ - } ] }{HA}\)

This is called known as the Henderson- Hasselbalch equation which relates the pH of an acid aqueous solution with the acid dissociation constant.

\(pH=pK _{a } + log \frac{Conjugate \: base}{acid}\)

The Henderson-Hasselbalch equation is derived from the definition of the acid dissociation constant as follows.

Consider the hypothetical compound HA in water.

\(HA +H _{2}O→ H _{3} O ^{ + } + A^{ - } \)

The acid dissociation constant of HA,

\( [H _3O ^{ + }] = K _a \times \frac{HA}{[A ^{ - } ] }\)

\(log [H _3O ^{ + }] = logK_a+log\frac{HA}{[A ^{ - } ] }\)

Multiply both sides of the equation by -1.

\(-log[H_3O ^{ + }]=-logK_a-log\frac{HA}{[A ^{-} ] }\)

\(pH=pK _{a }+log \frac{[A ^{ - } ] }{HA}\)

\([HA] = [A-]\)

\(pH =pKa +log1\)

\(pH = pKa + 0\)

pH=pKa

pKa value of compounds can be determined experimentally using its relation with pH.

According to the Henderson-Hasselbalch equation, when the concentrations of the acid and the conjugate base are the same, i.e when the acid is 50% dissociated, the pH of the solution is equal to the pKa of the acid.

\(pK _{a } \: value \: for \: propanoic \:acid \: = 4.874\)

\(Let \: propanoic \: acid \: be \: HA.\)

\(Let \: propionate \: be \:A ^{ - } .\)

So Henderson-hasselbalch equation for the propanoic acid solution is,

\(pH=pK _{a } + log \frac{[A ^{ - } ] }{HA}\)

\(pH=4.874 + log \frac{[A ^{ - } ] }{HA}\)

Therefore, Henderson's Hasselbalch equation for the propanoic acid solution is

\(pH=4.874 + log \frac{[A ^{ - } ] }{HA}.\)

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Answer:Atoms acquire the stable electron structure of a noble gas by losing electrons. An atom of an element in Group 1A has seven valence electrons. Among Group 1A and 2A elements, the group number is equal to the number of valence electrons in an atom of that element.

Explanation: Hope this help have an wonderful day and stay safe! :D

The number of candies each of the grandchild would get is 24, 18 and 16 candies respectively.

Given the following data:

To determine the number of candies each of the grandchild would get:

Note: The candies were distributed to the grandchildren inversely proportional to their ages.

Mathematically, this is given by this expression:

\(Candies \; \alpha\; \frac{1}{Age}\)  ≡ \(C = \frac{k}{A}\)

Thus, the above expression is re-written for all the grandchildren as follows:

\(58 = \frac{k}{6} + \frac{k}{8}+\frac{k}{9}\)

Lowest common multiple (LCM) of 6, 8 and 9 is 72.

\(58=\frac{12k +8k+9k}{72} \\\\58=\frac{29k}{72}\\\\29k =72 \times 58\\\\29k =4176\\\\k=\frac{4176}{299}\)

k = 144.

For the first grandchild:

\(Candy = \frac{k}{6} \\\\Candy = \frac{144}{6}\)

Candy = 24 candies.

For the second grandchild:

\(Candy = \frac{k}{6} \\\\Candy = \frac{144}{8}\)

Candy = 18 candies.

For the third grandchild:

\(Candy = \frac{k}{6} \\\\Candy = \frac{144}{9}\)

Candy = 16 candies.

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Answer:

L-2.75 W-2.75 H-2.85

Explanation:

Emerging scientific ideas are new theories or ideas that are gaining attention in the scientific community, but have not yet been fully accepted or confirmed.

Emerging ideas refer to the new and innovative ideas or theories that have yet to gain full scientific acceptance. While a scientific consensus is a view or theory that has been universally accepted and confirmed by multiple experiments or research, an emerging scientific idea is a new and unproven theory or idea that is gaining attention in the scientific community. These emerging ideas may also be referred to as scientific hypotheses. In contrast to scientific consensus, emerging scientific ideas have not yet been subjected to rigorous testing and confirmation.

They are generally proposed to explain new observations or experimental results, which have not yet been fully understood or explained by established scientific theories. Emerging scientific ideas can have the potential to challenge the current scientific consensus. If an emerging scientific idea is found to be valid, it can ultimately lead to the establishment of a new scientific consensus. For example, the emerging scientific idea of the Higgs boson particle led to the discovery of a new field in particle physics, which is now an established scientific consensus.

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Answer:

Solubility is the best to dissolve

the diagram that best represents the particle-level structure of steel as alloy is option (b).

Alloy, often known as an alloy, is a metallic material made up of two or more elements. Even though carbon, a nonmetal, is a crucial component of steel, the constituents of alloys are typically themselves metals.

Typically, melting the mixture of materials produces alloys. Early civilizations recognized the usefulness of alloys; brass (copper and zinc) and bronze (copper and tin) were particularly significant.

Steel is an alloy of iron and carbon. carbon range is upto 2 percent in the mixture.

In steel iron atoms are larger than carbon.

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The acceptable result when testing a catalytic converter with an infrared pyrometer is that both the inlet and outlet should be the same temperature after the converter reaches operating temperature.

A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Catalytic converters are usually used with internal combustion engines fueled by gasoline or diesel, including lean-burn engines, and sometimes on kerosene heaters and stoves.

This indicates that the catalytic converter is functioning properly and is effectively converting harmful emissions into less harmful ones.

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Answer:

Weather is : the state of the air and atmosphere at a particular time and place : the temperature and other outside conditions (such as rain, cloudiness, etc.) at a particular time and place. And how to fold clothes:

Fold in one side of the shirt towards the centre, about a third.

Fold the sleeve back the other direction, away from the centre.

Long sleeves can be folded again down towards the hem.

Repeat on the other side.

Fold the collar end towards the bottom hem, making a rectangle.

Explanation:

Answer:

Weather is the state of the air and atmosphere at a particular time and place: the temperature and other outside conditions (such as rain, cloudiness, etc.) in a specific time and place. And how to fold clothes

Explanation:

Fold about a third in one side of the shirt towards the center.

Fold the sleeve back in the other direction, away from the center.

Long sleeves can be folded again down towards the hem.

Repeat on the other side.

Fold the collar end towards the bottom hem, making a rectangle.