Calculate molality (m)of benzoic acid, in mol/kg, using the formula Δt = Kf × m. (The Kf value for lauric acid is 3.9°C•kg/mol) Calculate moles of benzoic acid solute, using the molality and the mass (in kg) of lauric acid solvent. Calculate the experimental molecular weight of benzoic acid, in g/mol. Determine the accepted molecular weight of benzoic acid from its formula, C6H5COOH. Calculate the percent discrepancy between the experimental and accepted values.
mass of lauric acid (g) : 8.00
mass of benzoic acid (g): 1.50
Freezing point of pure lauric acid (C): 36.37
Freezing point of benzoic acid-lauric acid mixture (C): 42.51

Answer:

hydro ponic plants

Explanation:

coz they are hydro

Answer:

A)566×10^-16J

B)711.99×10^-16J

C)688.69×10^-12J

Explanation:

A)

But we know that

1 nm = 10^-9 m

Then we can Convert from nanometer to metre which is SI unit

632.8 nm = 632.8×10^-9 m = 6.328×10^-7 m

The speed of light is c = 2.998×10^8 m/s

λ = 6.328×10^-7 m

But the frequency can be calculated as;

ƒ = c / λ

ƒ = (2.998×10^8 m/s) / (6.328×10^-7 m)

Then

ƒ = 4.738×10^14 s-1

To calculate Energy we use

Energy= hf

Where h is plank constant= 6.626× 10^-34

Energy= 6.626× 10^-34 × 4.738×10^14=566×10^-16J

B)

But we know that

1 nm = 10^-9 m

Then we can Convert from nanometer to metre which is SI unit

Then 503 nm = 503×10^-9 m = 5.03×10^-7 m

c = 2.998×10^8 m/s

λ = 5.03×10^-7 m

But the frequency can be calculated as;

ƒ = c / λ

ƒ = (2.998×10^8 m/s) / (5.03×10^-7 m)

ƒ = 5.960×10^14 s-1

Energy= 6.626× 10^-34 × 5.960×10^14 s-1= 711.99×10^-16J

C)

1 nm = 10^-9 m

0.0520 nm = 0.0520×10^-9 m = 5.20×10^-11 m

Where the speed of light is

c = 2.998×10^8 m/s

λ = 5.20×10^-11 m

But the frequency can be calculated as;

ƒ = c / λ

ƒ = (2.998×10^8 m/s) / (5.20×10^-11 m)

ƒ = 5.765×10^18 s-1

Energy= 6.626× 10^-34 × 5.765×10^18 s-1= 688.69×10^-12J

Answer:

Boiling

Explanation:

The style of Vincent Van Gogh's Starry Night (1889) is Post-Impressionism.

Post-Impressionism is an art movement that developed in France in the late 19th century as a reaction against the limitations of Impressionism. It is characterized by a focus on subjective emotions and personal interpretations of the world, as well as an interest in the formal qualities of art, such as color, line, and form.

Van Gogh's work is known for its expressive use of color and texture, and Starry Night is a prime example of his Post-Impressionist style, with its swirling brushstrokes, intense colors, and dreamlike quality.

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Answer:

metallic bonding

Explanation:

Copper wire consists of Cu nuclei (that are positively charged due to the positively charged protons) that are surrounded by a "sea" of delocalized electrons (that are negatively charged that move freely throughout the material which is known as metallic bonding.

Answer:

Metallic bonding.

Explanation:

Pure copper is neither covalent nor ironic. It is a bonding called metallic bonding.

Answer:

A = 1.2L

B = 506.6 torr

C = 13.5 °C

Answer:

A = 1.2L B = 506.6 torr and C = 13.5 °C

have a nice day :)

Answer:

Mass = 0.37 g

Explanation:

Given data:

Number of moles of sulfur = 11.9 mol

Mass of sulfur in 11.9 mol = ?

Molar mass of sulfur = 32.06 g

Solution:

Number of moles = mass/molar mass

by putting values,

11.9 mol = mass/ 32.06 g/mol

Mass = 11.9 mol × 32.06 g/mol

Mass = 0.37 g

Answer: its combustion

Explanation:

Answer:

How many grams of K2Cr2O7, are soluble in 100 g of water at 95 ºC? Solubility Curve DRAFT. 10th - 12th grade. 3326 times. Chemistry. 63% average accuracy. 3 years ago ... When 20 grams of potassium chlorate, KClO 3, is dissolved in 100 grams of water at 80 ºC, the solution can be correctly described as: answer choices . supersaturated. saturated.

Explanation:

The correct option is (g) i.e. 10 is the sum of all the stoichiometric coefficients in the balanced chemical equation for the reaction given in the question.

To find the sum of all the stoichiometric coefficients in a balanced chemical equation, we need to add up all the coefficients in front of the chemical formulas on both sides of the equation.

The balanced chemical equation for the reaction of aluminium with platinum (IV) nitrate is:

2 Al + 3 Pt(NO3)4 ---> 2 Al(NO3)3 + 3 Pt

The sum of all the stoichiometric coefficients is

2 + 3 + 2 + 3 = <<2+3+2+3=10>>10.

Therefore, the answer is (g) i.e. 10.

Stoichiometry coefficients is based on the law of conservation of mass, which states that the sum of the masses of the reactants and products must be equal to one another. This insight led scientists to the conclusion that the ratio of positive integers is frequently produced by the relationships between the amounts of the reactants and products. This implies that the amount of the product may be determined if the amounts of the various reactants are known. However, if the quantity of one reactant is known and the quantity of the products can be established using empirical data, the quantity of the other reactants can likewise be computed. Stoichiometry is founded on some basic rules, which make it simpler to understand. These laws include the law of conservation of mass, the law of definite proportions (also known as the law of constant composition), the law of multiple proportions, and the law of reciprocal proportions.

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Answer:

The surface of earth sits on plates that move over time because of the pressure build up underneath.When the pressure releases the pressure goes through the cracks of the plates (Or Earth) pushing them apart causing earthquakes and volcano eruptions.

Explanation: Science

Answer:

hydrogenphosphate I think

Answer:

0.44 mole of oxygen gas can 0.88 mole of hydrogen peroxide (h2o2) produce, if decomposition is complete.

Answer:

kinetic energy

Explanation:

Solid particles have the least amount of energy, and gas particles have the greatest amount of energy. The temperature of a substance is a measure of the average kinetic energy of the particles. A change in phase may occur when the energy of the particles is changed. There are spaces between particles of matter.

Temperature is a measure of the average kinetic energy of the particles of a substance. The higher the temperature of an object, the higher is its kinetic energy.

Temperature measures the average kinetic energy of particles of the substances. Therefore, the temperature of a substance is a measure of the kinetic energy.

Temperature is used to measure degree or intensity of heat of a particular substance. Temperature is measured by an instrument called thermometer.

Temperature can be measured in degree Celsius °c, Kelvin k or in Fahrenheit. Temperature is a physical quantity. Heat always flow from higher temperature source to lower temperature source.

We can convert these units of temperature into one another. The relationship between degree Celsius and Fahrenheit can be expressed as:

°C={5(°F-32)}÷9

The temperature of a substance is a measure of the kinetic energy.

Therefore, the temperature of a substance is a measure of the kinetic energy.

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The mass and charge must be balanced so that the compound formed is neutral. The limiting reactant determines the amount of the precipitate that can be formed.

When we talk about an ionic equation, we are talking about the kind of equation that is able to show the ions that are able to undergo a change in a given reaction. We know that in many cases the ionic reaction would lead to the formation of a precipitate and this is the solid product that is obtained when we happen to mix two solutions that are known to be aqueous solutions.

Having made all that introduction, we know that a compound is said to be neutral when the charges in the species that form the compound could be seen as being balanced. This is the reason why the mass and charge must be balanced when we are dealing with an ionic reaction equation.

The factor that determines the amount of precipitate that would form is the limiting reactant of the process.

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The reaction as shown is known to be an exothermic reaction.

Depending on the temperature of the reaction vessel after reaction, the reaction could be classified as;

In an endothermic reaction, heat is absorbed and the rate of reaction increasing with increase in temperature while in an exothermic reaction, the rate of reaction decreases with increase in temperature.

Hence, the correct statements are;

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To solve this problem using the gas laws, we need to use the Ideal Gas Law. This law states that the product of the pressure and the volume of a gas is proportional to the absolute temperature.

The equation of the Ideal Gas Law is the following:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{\dfrac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2} } \end{gathered}$} }\)

Where:

We clear for V₂:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{P_1V_1T_2}{P_2T_1 } } \end{gathered}$} }\)

Where:

Substituting the known values:

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760\not{kPa}\times0.050 \ L\times20.0\not{k} }{ 380\not{kPa}\times10.0\not{k} } } \end{gathered}$} }\)

\(\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2=\frac{760 \ L}{3800 } } \end{gathered}$} }\)

\(\boxed{\boxed{\large\displaystyle\text{$\begin{gathered}\sf \bf{V_2\approx0.2 \ Liters} \end{gathered}$} }}\)

306.178 liters is the volume of O2 at STP, required for the complete combustion of 125g octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and H20

To calculate the volume of \(O_{2}\) required for the complete combustion of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\) at STP (Standard Temperature and Pressure), we need to consider the stoichiometry of the balanced chemical equation.

The balanced equation for the combustion of octane is:

\(C_{8}H_{18}\) + 12.5\(O_{2}\) -> 8\(CO_{2}\) + 9\(H_{2}O\)

From the equation, we can see that 1 mole of octane requires 12.5 moles of \(O_{2}\) to completely combust. The molar mass of octane (\(C_{3}H_{18}\)) is approximately 114.22 g/mol.

To calculate the moles of octane, we divide the given mass by the molar mass:

Moles of octane = 125 g / 114.22 g/mol ≈ 1.093 mol

Since the molar ratio between octane and \(O_{2}\) is 1:12.5, the moles of \(O_{2}\)required can be calculated as:

Moles of \(O_{2}\) = 1.093 mol * 12.5 ≈ 13.663 mol

Now, we can use the ideal gas law, PV = nRT, to calculate the volume of \(O_{2}\) at STP. At STP, the temperature is 273 K, and the pressure is 1 atm.

Using the molar volume of an ideal gas at STP (22.4 L/mol), the volume of \(O_{2}\) required is:

Volume of \(O_{2}\) = Moles of \(O_{2}\) * Molar volume = 13.663 mol * 22.4 L/mol ≈ 306.178 L

Therefore, approximately 306.178 liters of \(O_{2}\) at STP would be required for the complete combustion of 125 grams of octane (\(C_{8}H_{18}\)) to \(CO_{2}\) and \(H_{2}O\)

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Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds found in the former are typically much stronger attractions than ordinary dipole moments in the latter.

This is referred to as the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor.

Ethanol (C2H6O), an alcohol has a much higher boiling point than dimethyl ether (C2H60) because hydrogen bonds have a stronger attraction which  makes it more difficult for the atoms to be broken down hence the reason why the boiling point will be higher in this scenario.

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Answer:

Three primary reasons. First, there is simply more water-covered places than dry ground places for the animals and plants to have lived. Second, the seas are much more crowded with the kinds of life that leave fossils than the land is. Third, the process that form fossils work very well under water.

Explanation:

Answer:

The answer to this reaction would be C-C-OH + H2.

The mass of the cereal that you would need to consume can be obtained as 84.8 g

The number of moles, denoted by the symbol "n," is a fundamental unit of measurement in chemistry that represents the amount of a substance. It is used to quantify the quantity of atoms, molecules, or ions in a sample.

Number of moles of sucrose in the cereal = 11g/342 g/mol

= 0.03 moles

Now;

0.03 moles of sucrose is contained in 60 g of cereal

0.0424 moles of sucrose would contain 0.0424 moles * 60 g/0.03 moles

= 84.8 g

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Answer:

lt serves as a home where crews of astronauts and cosmonauts live. The space station is also a unique science laboratory. Several nations worked together to build and use the space station. The space station is made of parts that were assembled in space by astronauts.

Explanation:

There are approximately 1.765 x 10²³ molecules of KCl in 21.89 grams of KCl.

Potassium chloride (KCl) is a compound made up of potassium and chloride ions. It is a colorless, odorless salt that is commonly used in a variety of applications.

Molar mass of KCl is 74.55 g/mol; number of moles = Mass/ Molar mass

So, the number of moles = 21.89 g ÷ 74.55 g/mol = 0.2936 mol

and the number of molecules = Number of moles * Avogadro's number

Number of molecules = 0.2936 mol x 6.02 x 10²³ molecules/mol

Number of molecules = 1.765 x 10²³ molecules

Therefore, there are approximately 1.765 x 10²³ molecules of KCl in 21.89 grams of KCl.

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