A student determines that a 9.8 g mixture of MgCl₂ (s) and NaNO3(s) contains 0.050 mol of
MgCl₂(s).
Based on the student's measurement, what is the mass percent of Cl in the mixture?

Answer: 55.5 oC is 0.014 atm (3rd decimal point)

Explanation:

The Clausius-Clapeyron equation is given as:

ln(P2/P1) = -(ΔH_vap/R) * (1/T2 - 1/T1)

where:

P1 = vapor pressure at temperature T1

P2 = vapor pressure at temperature T2

ΔH_vap = enthalpy of vaporization

R = gas constant = 8.314 J/(mol*K)

Converting the enthalpy of vaporization to J/mol:

ΔH_vap = 35.2 kJ/mol = 35,200 J/mol

Converting temperatures to Kelvin:

T1 = 64.7 + 273.15 = 337.85 K

T2 = 55.5 + 273.15 = 328.65 K

Substituting the values into the equation and solving for P2:

ln(P2/1 atm) = -(35,200 J/mol / 8.314 J/(mol*K)) * (1/328.65 K - 1/337.85 K)

ln(P2/1 atm) = -4.231

P2/1 atm = e^(-4.231)

P2 = 0.014 atm

Therefore, the vapor pressure for methanol at 55.5 oC is 0.014 atm, to the third decimal point.

The term molefraction is an important method which is used to calculate the concentration of a solution. It is mainly employed to calculate the concentration of a binary solution. Here the molefraction is 1 / 5. The correct option are D, D and B.

Molefraction of any component of a solution is defined as the ratio of the number of moles of that component to the total number of moles of the solution. The sum of molefraction of solute and solvent is one.

Here the molefraction of nitrogen = Moles of nitrogen / Total number of moles

1. 'x' of 'N' = 2 / 5 + 3 + 2 = 0.2 or 1 / 5

2. Molefraction of Argon = 0.60 / 0.40 + 0.04 + 0.60 = 0.57

Partial pressure = Molefraction × Total pressure

0.57 × 6.3 = 3.59 atm

3. 20 cm³ mixture contains:

20 × 1 mole / 22400 m³ = 8.9286 × 10⁻⁴

1 mole occupies 22400 cm³

8.9286 × 10⁻⁴ × 22400 cm³ / 1 mole = 20 cm³

Thus the correct option are D, D and B.

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A glass of wine costs about $12 at a pub. A 5-ounce glass of wine, or 147 mL, counts as one serving. This indicates that the typical bottle can accommodate five 5-ounce wine glasses. Ten wine glasses can fit within a magnum bottle. 20 glasses of wine fit inside a double-magnum bottle.

A case of 12 wine bottles contains 9 litres, or 2.378 gallons, as a typical wine bottle is 750 millilitres in size. A tonne of grapes yields 150 gallons every tonne, which translates to 150/2.378 gallons each case, or just over 63 cases, of wine. We have a total of 756 bottles, 12 bottles each case.

Since 1 ounce equals slightly under 30 ml, a glass has a volume of 120 ml. A 750 ml bottle of wine will therefore yield slightly more than 6 glasses.

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The pressure of a sample of dry air is held constant 2.25 atm while the temperature is decreased from 100°C to 7.0°C. The original volume of the sample is 43 L. 32 L is the closest to the final volume of the sample?

A law states that the volume of an ideal gas at constant pressure is directly proportional to the absolute temperature.

Charles’ law:

\(\frac{V_1}{T_1}\) = \(\frac{V_2}{T_2}\)

The volume and temperature of a fixed amount of gas at a constant pressure are directly proportional.

To use the equation, the temperature must be in Kelvin.

\(V_2\) = \(\frac{V_1}{T_1} XT_2\)

\(V_2\) = 32 L

\(V_2\)= 32 L

Hence, the correct answer is B.

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Answer:

B.

Explanation:

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Answer:

2nd One is correct

The options that affect the amount that the freezing point is lowered by the addition of the solute include :

The increasing of a solvent's boiling point as a result of the addition of a solute is known as boiling point elevation. Similar to freezing point depression, adding a solute lowers the freezing point of a solvent. In actuality, a solvent's freezing point drops as its boiling point rises.

Any solvent's freezing point will be lowered by the presence of a solute; this action is known as freezing-point depression. The fact that the solute is present in the liquid solution but not in the pure solid solvent is crucial to understanding this phenomenon.

This includes the compound being ionic or the solubility of the solvent.

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Answer:

Kc = 3.94

Explanation:

CH₃COOH(g) + C₂H₅OH(g) → CH₃COOC₂H₅(g) + H₂O(g)

Liquids aren't included in the equilibrium constant, but at 100°C, all four compounds are a gas.  So the equilibrium equation is:

Kc = [CH₃COOC₂H₅] [H₂O] / ([CH₃COOH] [C₂H₅OH])

Set up an ICE table for each row and calculate the value of Kc.  Then average the results.  (See picture.)

Kc ≈ (3.919 + 4.012 + 3.902) / 3

Kc ≈ 3.94

The molar concentration of Fe3+ in the solution is approximately 230.82 M.

To calculate the molar concentration of Fe3+, we can use the Nernst equation, which relates the cell potential to the concentrations of the species involved in the cell reaction.

The Nernst equation is given as:

Ecell = E°cell - (0.0592/n) * log(Q)

Where:

Ecell is the measured cell potential (0.65V in this case),

E°cell is the standard cell potential (0.72V in this case),

n is the number of electrons transferred in the cell reaction (in this case, it is 2, as Fe3+ gains 2 electrons to form Fe),

Q is the reaction quotient.

In this case, the reaction at the cathode is:

Fe3+(aq) + 2e- -> Fe(s)

And the reaction quotient Q can be expressed as the molar concentration of Fe3+:

Q = [Fe3+]

Substituting the given values into the Nernst equation, we have:

0.65V = 0.72V - (0.0592/2) * log([Fe3+])

Simplifying the equation:

0.65V = 0.72V - 0.0296 * log([Fe3+])

0.0296 * log([Fe3+]) = 0.07V

log([Fe3+]) = 0.07V / 0.0296

log([Fe3+]) ≈ 2.3659

Taking the antilog (inverse logarithm) of both sides:

[Fe3+] ≈ 10^(2.3659)

[Fe3+] ≈ 230.82

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Answer:

Explanation:

The pH of a solution is the negative logarithm (base 10) of its hydrogen ion concentration (H+):

pH = -log[H+]

In this case, the hydrogen ion concentration is 0.0048 M, so we can calculate the pH as:

pH = -log(0.0048) = 2.32

Therefore, the pH of the solution is 2.32.

Since the pH is less than 7, the solution is acidic.

The statement 'the pKa is the pH at which a weak acid’s protons are 50% titrated' is true as weak acids do not have the ability to get completely ionized.

The statement is true because weak acids do not completely ionize in solution, so at a certain pH, half of the acid’s protons will be titrated.

This is known as the acid’s dissociation constant, which is a measure of the acid’s ionization in solution. The pKa is the pH at which the acid’s dissociation constant is equal to one.

The lower the pKa, the more acidic the solution will be. A weak acid with a pKa of 2 will be more acidic than one with a pKa of 5.

Therefore, the statement 'the pKa is the pH at which a weak acid’s protons are 50% titrated' is true.

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Answer:

78.68g Na

121.32 Cl

Explanation:

This one is more easy than the wording makes it seem. Since there are 60.66g of sodium (Na) and 39.34g of Chlorine (Cl) it adds up to 100g, so in this case you can just double each amount, and get what each would be in a 200g sample.

Answer:

Speed can be thought of as the rate at which an object coverse distance

B) Reate distance

Answer:

95.9 kg

Explanation:

First we convert 15.0 mi² to m²:

Then we convert 27.0 ft to m:

Now we calculate the total volume of the lake:

Converting 3.20x10⁸ m³ to L:

Now we calculate the total mass of mercury in the lake, using the given concentration:

Finally we convert μg to kg:

Answer:

\(8.97x10^{22}molecules C_3H_8\)

Explanation:

Hello there!

In this case, according to the given chemical reaction and the fact that 22.4 L of a gas are occupied by 1 mol at standard pressure and temperature conditions, it will be possible for us to calculate the number of molecules of propane, by using the Avogadro's number, the 1:3 mole ratio with carbon dioxide and the aforementioned volume-mole ratio to obtain:

\(10.01LCO_2*\frac{1molCO_2}{22.4LCO_2}*\frac{1molC_3H_8 }{3molCO_2} *\frac{6.022x10^{23}molec\ C_3H_8}{1molC_3H_8} \\\\=8.97x10^{22}molecules C_3H_8\)

Regards!

Answer:

yes it is a chemical reaction

Explanation:

because the substances combined and made something new

Answer:

To calculate the number of photons required to heat the coffee, we can follow these steps:

Calculate the mass of the coffee using its volume and density:

mass = volume x density = 205 mL x 0.997 g/mL = 204.185 g

Calculate the amount of heat required to raise the temperature of the coffee using its mass, specific heat capacity, and temperature change:

q = m x c x ΔT = 204.185 g x 4.184 J/(g⋅K) x (62.0 - 25.0) °C = 32289.6 J

Calculate the energy of each photon using the formula E = hc/λ, where h is Planck's constant, c is the speed of light, and λ is the wavelength of the microwave radiation:

E = (6.626 x 10^-34 J⋅s) x (3.00 x 10^8 m/s) / (0.124 m) = 5.067 x 10^-23 J

Calculate the number of photons required to deliver the amount of energy needed to heat the coffee:

number of photons = q / E = 32289.6 J / 5.067 x 10^-23 J = 6.368 x 10^25 photons

Therefore, approximately 6.368 x 10^25 photons are required to heat 205 mL of coffee from 25.0 ∘C to 62.0 ∘C using microwave radiation with a wavelength of 12.4 cm.

Answer:

The new volume of the gas is 0.332 liters.

Explanation:

Let suppose that argon behaves ideally, the equation of state of the ideal gas is:

\(P\cdot V = n \cdot R_{u}\cdot T\)

Where:

\(P\) - Pressure, measured in torr.

\(V\) - Volume, measured in liters.

\(n\) - Molar quantity, measured in moles.

\(T\) - Temperature, measured in kelvins.

\(R_{u}\) - Ideal gas constant, measured in \(\frac{torr\cdot L}{mol \cdot K}\).

Since gas sample is a closed system experimenting a heating process, that is, molar quantity remains constant, the following relationship is derived from the equation of state described above:

\(\frac{P_{o}\cdot V_{o}}{T_{o}} = \frac{P_{f}\cdot V_{f}}{T_{f}}\)

Where:

\(P_{o}\), \(P_{f}\) - Initial and final pressures, measured in torr.

\(V_{o}\), \(V_{f}\) - Initial and final volumes, measured in liters.

\(T_{o}\), \(T_{f}\) - Initial and final temperatures, measured in kelvins.

Now, the final volume of the gas is found:

\(V_{f} = \left(\frac{T_{f}}{T_{o}}\right)\cdot \left(\frac{P_{o}}{P_{f}} \right)\cdot V_{o}\)

If \(T_{o} = 286.15\,K\), \(T_{f} = 429.15\,K\), \(P_{o} = 568\,torr\), \(P_{f} = 897\,torr\) and \(V_{o} = 0.35\,L\), the new volume of the gas is:

\(V_{f} = \left(\frac{429.15\,K}{286.15\,K} \right)\cdot \left(\frac{568\,torr}{897\,torr} \right)\cdot 0.35\,L\)

\(V_{f} = 0.332\,L\)

The new volume of the gas is 0.332 liters.

Answer:

Liquid

Explanation:

The amount of heat absorbed by 52.7 g of aluminum as it changes temperature from 23.0 c to 67.0c is solved to be 2044.48 J.

For thermodynamic investigations, scientists needed a measurement that was independent of the quantity or size of the material being considered, therefore they created the concept of specific heat capacity.

Being unaffected by the quantity or size of the matter makes it an intense quality. A material's or matter's specific heat capacity is the amount of heat energy needed to raise the temperature of a unit mass of that substance by one degree Celsius.

To calculate the heat absorbed by a piece of aluminum as its temperature changes, use the formula:

Q = mcΔT

where:

Q is heat

m is mass (52.7 g)

c is specific heat capacity of aluminum (0.90 J/g°C)

ΔT is change in temperature (67.0°C - 23.0°C = 44.0°C)

Plugging in the values, we get:

Q = 52.7 g * 0.90 J/g°C * 44.0°C = 2044.48 J.

So, the 52.7 g piece of aluminum absorbs 2044.48 J of heat as its temperature changes from 23.0°C to 67.0°C.

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Answer:

It has 17 protons, 17 electrons, and 18 neutrons/ 35 protons, 35 electrons, and 17 neutrons. 21. Phosphorus-33 (atomic number 15) contains 18 neutrons/ 18 protons

The Transcontinental Railroad was the main development that started a large movement of settlers to California. It was the first railway line to span the entire continent, connecting the east and west coasts of the United States.

The railroad greatly facilitated migration and allowed for widespread settlement of the West. It improved communication between the east and west coasts, sped up transportation, and made it possible for a more productive interchange of goods.

Also, the railroad made it possible for prospectors to reach California in search of the California Gold Rush. Also, the railroad made it possible for cattle ranchers to transport their herds of cattle to the California stockyards.

As a result, there was more beef available, which aided in the state's agriculture sector's expansion. Also, the railroad offered an effective way to ship mining and agricultural goods to the east coast.

Hence, the Transcontinental Railroad served as the main driving force behind the massive migration of settlers to California.

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Based on the mole ratio of the balanced equation of the reaction,

The mole ratio of the reaction is obtained from the balanced equation of the reaction as follows:

Balanced equation of reaction: 2 C₂H₆ + 7 O₂ ------> 4 CO₂ + 6 H₂O

From the balanced equation of the reaction, the mole ratio of the reaction shows that 2 moles of ethane, C₂H₆, undergo combustion with 7 moles of oxygen, O₂, to produce 4 moles of carbon (iv) oxide, CO₂, and 6 moles of water, H₂O.

Hence;

4.5 moles of ethane will require 4.5 * 7/2 moles of oxygen

moles of oxygen required = 15.75 moles of oxygen

Moles of carbon (iv) oxide, CO₂, produced = 4.5 * 4/2

Moles of carbon (iv) oxide, CO₂, produced = 9 moles

Moles of water, H₂O, produced = 4.5 * 6/2

Moles of water, H₂O, produced = 13.5 moles

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Answer:

A

Explanation:

The number of protons and neutrons of an element is the same. the electrons are the only thing that can differ.  The atomic number equal the protons and neutrons.

Answer:

6 moles of Carbon.

Explanation:

One mole of Carbon is equal to 12 grams of Carbon, so you would divide 72 by 12 and the answer would be 6.

The question is incomplete; part of the data required in the question are shown:

Theoretical Yield: 2.05 g salicylic acid x (180g aspirin/1 mol) x (1 mol/138 g salicylic acid) 2. Mass of filter paper 2.56 g 3. Mass of filter paper and aspirin 5.42 g 4. Mass of aspirin (3-2) g. Percent Yield [(4)/(1)] x 100

Answer:

107%

Explanation:

We can calculate the theoretical yield as shown;

2.05g salicylic acid × 180g aspirin/1mol × 1 mol/138g of salicylic acid

Theoretical yield= 2.67 g of aspirin

Actual yield of aspirin is obtained from the experimental data;

Mass aspirin + filter paper= 5.42 g

Mass of filter paper= 2.56 g

Mass of aspirin= 5.42 g -2.56 g = 2.86 g

Hence actual yield of aspirin = 2.86 g

Percentage yield = actual yield/theoretical yield × 100

Percentage yield = 2.86/2.67 ×100 = 107%