A 2.950×10−2 M solution of glycerol (C3H8O3) in water is at 20.0∘C. The sample was created by dissolving a sample of C3H8O3 in water and then bringing the volume up to 1.000 L. It was determined that the volume of water needed to do this was 998.7 mL . The density of water at 20.0∘C is 0.9982 g/mL.Calculate:
a. molality
b. mole fraction of glycerol in this solution
c. the concentration of the glycerol solution in percent by mass
d. the concentration of the glycerol solution in parts per million

Explanation:

The difference between heat and thermal energy is that thermal energy is not in the process of being transferred; it is not in transit, but remains as part of the internal energy of the system; heat, on the other hand, is energy in transit, i.e. energy in the process of being transferred from a hotter system.

According to the explanation given in our previous session, now we have a similar question but with a slight difference, but first let's set up the reaction:

2 RbNO3 -> 2 RbNO2 + O2

We have 5.0 moles of RbNO3

From the molar ratio we see that 2 moles of RbNO3 is equal to 1 mol of O2, therefore if we have 5 moles of RbNO3, we will have 2.5 moles of O2 being produced.

Since the question is asking "how many liters" we have to assume that we are dealing with gases and these gases are at STP (standard temperature and pressure), which is T = 273K and P = 1 atm, in these specfici conditions, 1 mol of gases will have a volume of 22.4 Liters, therefore if O2 has 2.5 moles of O2

1 mol = 22.4L

2.5 moles = x L

x = 56 Liters of O2 are being produced with 5.0 moles of RbNO3

The relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O is 249.

Molecular mass is a measure of the total mass of one mole of a substance, which is defined as the mass of the substance divided by the number of molecules it contains. It is typically expressed in g/mol and is also known as molar mass. Molecular mass is determined by the types and number of atoms that compose a molecule, and is an important factor in understanding the properties of a substance.

This is calculated by adding the atomic masses of all the atoms present in the compound.
The atomic mass of copper is 64, sulphur is 32, oxygen is 16, and hydrogen is 1.
So, the relative molecular mass of hydrated Copper (II) tetraoxosulphate (VI) CuSO4.5H₂O is 64 + 32 + (16*4.5) + (1*5) = 249.

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Answer:

Keq= [(Cl2) (H2)] / (HCl)^2

Explanation:

Equilibrium Constant, Keq, is written as products/reactants.

So it's going to be Keq= [(Cl2) (H2)] / (HCl)^2

Answer:

I'm not sure,

Explanation:

Can I have brainliest? It would help me out, if not thanks anyways! Hope this helped and have a nice day!

The B class main sequence star from the given images is Star 3.

B class main-sequence stars are of spectral type B and luminosity class V. They are very luminous and blue with surface temperatures between 10,000 and 30,000 K.

The stars that are blue as shown in the image are Star 1 and Star 3. However, Star is the one that has surface temperature between 10,000 and 30,000 K.

Therefore, Star 3 is a B class main sequence star.

In conclusion, stars are luminous objects with very high surface temperatures.

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Answer:

A covalent bond is a chemical bond that involves the sharing of electron pairs between atoms. These electron pairs are known as shared pairs or bonding pairs, and the stable balance of attractive and repulsive forces between atoms, when they share electrons, is known as covalent bonding. 

Answer:

A covalent bond is the “interatomic linkage that results from the sharing of an electron pair between two atoms.”

Explanation:

Hope this helps have a nice day

The milliliters of hot air that a balloon's gondola is suspended below is 2775millilitres.

Litres and millilitres are both unit of measures of volume.

According to this question, a hot air balloon's gondola is suspended below a cloth envelope containing 2.775 x 10⁰ liters of hot air.

The conversion factors of litres to milllilitres;

1000mL = 1L

2.775 × 10⁰ × 1000 = 2775millilitres

Therefore, the milliliters of hot air that a balloon's gondola is suspended below is 2775millilitres.

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Answer:

The volume of the gas is determined, which will allow you to calculate the temperature.

Explanation:

According to Charles law; the volume of a given mass of an ideal gas is directly proportional to its temperature at constant pressure.

This implies that, when the volume of an ideal gas is measured at constant pressure, the temperature of the ideal gas can be calculated from it according to Charles law.

Hence in the Ideal Gas Law lab, the temperature of an ideal gas is measured by determining the volume of the ideal gas.

Answer:

\(\huge\boxed{\sf n = 0.25\ moles}\)

Explanation:

Mass in g = m = 6.75 g

Molar mass of Al = M = 27 g/mol

No. of moles = n = ?

n = m / M

Put the given data in the above formula.

n = 6.75 / 27

\(\rule[225]{225}{2}\)

The molar concentration of the salt is  0.600 M. Option B

We know that the term molar concentration has to do with the number of moles of the salt that is present in one liter of the solution. We have been given the mass of the salt that is formed, we need to obtain the number of moles of the salt that has been formed and use the volume of the solution that have been given in the question to find the molar concentration of the salt.

Mass of the salt = 8.24 g

Molar mass of the salt = 58.5 g/mol

Number of moles of the salt = mass/molar mass

=  8.24 g/ 58.5 g/mol

= 0.14 moles

Volume of the solution = 235.0 mL or 0.235 L

Molar concentration =  0.14 moles/ 0.235 L

= 0.595 M or  0.600 M

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An electron has a negative charge.

The charge of an electron is a fundamental property of the particle, and it is denoted by the symbol "e." The magnitude of the charge of an electron is approximately 1.602 × 10^-19 coulombs (C). This value is considered the elementary charge and is used as a reference for other charges. The charge of an electron plays a significant role in determining the behavior and interactions of atoms and molecules. It is opposite in sign to the charge of a proton, which is positive. The electron's charge allows it to interact with other charged particles, such as protons and ions, through electrostatic forces. Electrons are subatomic particles that orbit the nucleus of an atom in specific energy levels or orbitals. They contribute to the overall stability and chemical properties of atoms and participate in chemical bonding and reactions. The movement of electrons between atoms is what enables the formation of chemical bonds and the sharing or transfer of electrons to create ions. In summary, the charge of an electron is negative, and it plays a fundamental role in the structure and behavior of atoms and molecules.

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Answer:

hi

Explanation:

Answer:

Average Atomic Mass= 63.5 amu

Explanation:

Average Atomic Mass Equation:

(Mass 1)(% Abundance) +(Mass 2)(% Abundance)

Plug in Variables:

Make sure to convert the percentages into decimals. (Left two places)

Use the order of operations when solving.

(62.9)(0.692) + (64.9)(0.308) = AAM

Multiply each side

43.5268 + 19.9892 = AAM

Add the products together

63.516 = AAM

Add proper unit and satisfy the 3 significant figures needed

63.5 amu

Answer:

             0.1608 mol/L

Explanation:

Calculate moles as,

Mole = Mass/M.Mass

Mole = 31.4 g / 78.045 g/mol

Mole = 0.402 mol

Now,

Molarity = Moles / Vol. in L

Molarity = 0.402 mol / 2.5 L

Molarity = 0.1608 mol/L

The rate law can only be determined experimentally through the method of initial rates or by determining the order of the reaction with respect to each reactant. Therefore, the correct answer is D. none of these.

In chemical kinetics, the rate law is an equation that relates the rate of a chemical reaction to the concentration of reactants. It is usually determined experimentally by measuring the initial rates of the reaction under different conditions of reactant concentration, temperature, and pressure.

The general form of a rate law for a reaction involving one or more reactants can be written as follows:

rate = k[A]x[B]y[C]z...

where rate is the rate of the reaction, k is the rate constant, [A], [B], [C]... are the concentrations of the reactants, and x, y, z... are the orders of the reaction with respect to each reactant.

In the given reaction X → Z, we are not given any information about the specific reaction mechanism or the dependence of the rate on the concentrations of X and Z. Therefore, it is not possible to determine the rate law without experimental data.

To determine the rate law experimentally, we would need to measure the initial rates of the reaction under different conditions of reactant concentrations and analyze the data to determine the orders of the reaction with respect to each reactant. Based on the experimental results, we could propose a rate law that fits the data and determine the value of the rate constant k.

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Answer:

predator

Explanation:

Wolves, arctic foxes, and snowy owls are predators in the tundra.

Answer:

Explanation:

The pH of 0.02 M hydrochloric acid is approximately 1.7.

THANKS

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Answer:

Explanation:

Here, we want to get the molar mass of the given molecule

To calculate this, we need the atomic masses of the individual atoms

We have 3 atoms present:

For Sodium (Na), the atomic mass is approximately 23 amu

For Phosphorus, the atomic mass is approximately 31 amu

For Oxygen, the atomic mass is approximately 16 amu

We have 3 atoms of sodium, 1 atom of phosphorus, and 4 atoms of oxygen

Adding the values, we have it that:

In an experiment, William Herschel determined the temperature differences between the visible spectrum's hues. The temperature increased, moving from blue to red, according to the findings.

On August 22, 2007, Dr. Stephen Warren of the University of Washington wrote: The world's lowest temperature was recorded on July 21, 1983, at Vostok Station in Antarctica. In their Table 2, Cerveny et al. (2007) provide this temperature as -89.4°C, citing Krauss und Flood (1997), who provided the same number.

People frequently cite a 2010 research that calculated a wet-bulb temp of 35 C, which is equivalent to 95 F at 100% humidity or 115 F at 50% humidity.

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Potential energy diagram for a combustion reaction:. CLICK ON IMAGE.

In a typical combustion reaction, the reactants (e.g. a fuel and an oxidizer) are initially at a relatively high potential energy. As the reaction proceeds, the potential energy of the system decreases, and the products (e.g. carbon dioxide and water vapor) are at a lower potential energy than the reactants. The difference in potential energy between the reactants and products corresponds to the heat released during the reaction.

The diagram shows the initial energy level of the reactants, the activation energy required to initiate the reaction, and the final energy level of the products. The activation energy is the minimum amount of energy required for the reaction to occur.

Once the reactants have absorbed enough energy to reach the activation energy threshold, the reaction proceeds spontaneously and releases energy as it progresses to the lower-energy products.

Note that the shape of the potential energy diagram can vary depending on the specific reaction and the reaction conditions. For example, some reactions may have more complex energy profiles with multiple intermediate steps or energy barriers.

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To calculate the molarity of vinegar, we need to know the moles of acetic acid (the main component of vinegar) and the volume of vinegar used.

The change in volume during the titration is:

Change in volume = Final volume - Initial volume

                = 33.5 mL - 12.3 mL

                = 21.2 mL

Assuming that the density of vinegar is approximately 1 g/mL, we can convert the change in volume to grams:

Change in volume (mL) × Density (g/mL) = Mass (g)

21.2 mL × 1 g/mL = 21.2 g

Next, we need to convert the mass of acetic acid to moles. The molar mass of acetic acid (CH3COOH) is approximately 60.05 g/mol:

Moles = Mass (g) / Molar mass (g/mol)

     = 21.2 g / 60.05 g/mol

     ≈ 0.353 mol

Finally, we calculate the molarity of vinegar using the moles and total volume:

Molarity = Moles / Total volume (L)

        = 0.353 mol / 0.0212 L

        ≈ 16.65 M

Therefore, based on the information provided, the molarity of vinegar is approximately 16.65 M.

ANSWER

STEP-BY-STEP EXPLANATION:

Given parameters

• The grams of the total sample = 40 grams

• The gram of calcium in the sample = 8 grams

Recall that, the sample contains calcium and bromine

Hence, we need to calculate the mass of bromine in the sample.

Sample = Calcium + bromine

40 = 8 + bromine

Substract 8 from both sides

40 - 8 = 8 - 8 + bromine

Bromine = 32 grams

Hence, the mass of bromine in the sample is 32 grams

The next thing is to find the number of moles of each element

Let the molar mass of each element be;

• Calcium = 40 g/mol

• Bromine = 79.904 g/mol

From the mole calculated, the lowest number of moles is 0.2 which is the calcium element.

The next thing is to divide through by 0.2 mole which is the lowest mole

Ca Br

0.2 0.40

0.2 0.2

1 2

Hence, the empirical formula is given below as

Answer:

287.6g CHCl₃

Explanation:

We can determine the structure of Chloroform, dividing the mass of each element in its molar mass:

C = 12.0g * (1mol /12g) = 1 mol C

H = 1.01g * (1mol / 1.01g) = 1 mol H

Cl = 106.4g * (1mol / 35.45g) = 3 moles Cl

The structure is CHCl₃. And its molar mass is: 12.0g C +1.01g H + 106.4g Cl = 119.41g/mol

Now, the moles of carbon in the second sample = Moles of chloroform are:

28.9g C * (1mol / 12g) = 2.408 moles C = Moles CHCl₃

And its mass is:

2.408 moles CHCl₃ * (119.41g/mol) =

Explanation:

Sodium and oxygen react to produce sodium oxide. The balanced equation of the reaction is:

4 Na + O₂ ----> 2 Na₂O

First we can convert the 45.35 g of Na₂O into moles using its molar mass.

molar mass of Na = 22.99 g/mol

molar mass of O = 16.00 g/mol

molar mass of Na₂O = 2 * 22.99 g/mol + 1 * 16.00 g/mol

molar mass of Na₂O = 61.98 g/mol

moles of Na₂O = 45.35 g * 1 mol/(61.98 g)

moles of Na₂O = 0.7317 moles

4 Na + O₂ ----> 2 Na₂O

According to the coefficients of the reaction, 4 moles of Na will react with 1 mol of O₂ to produce 2 moles of Na₂O. Then the molar ratio between O₂ and Na₂O is 1 to 2. We can use that relationship to find the answer to our problem.

1 mol of O₂ : 2 moles of Na₂O

moles of O₂ = 0.7317 moles of Na₂O * 1 mol of O₂/(2 moles of Na₂O)

moles of O₂ = 0.3659 mol

Answer: 0.3659 moles of oxygen are needed to produce 45.35 g of sodium oxide.