(01.04 lc)water is often called the "universal solvent" because many substances can be dissolved in water. what property of water allows it to be such a versatile solvent?

1 liter of 0.1 M sucrose solution means that there is 34.2 g of sucrose dissolved in water to make a 1 liter solution. This also means that there are 6.022 × 10²² molecules of sucrose in this solution.  

Molarity is a unit of concentration which describes the number of moles of solute dissolved per liter of a solution. It is calculated using the equation below:

[tex]molarity = \frac{moles \ of \ solute}{volume \ of \ solution}[/tex]

Molarity is expressed with the unit mol/L or M (read as “molar”).  It is a very useful unit of concentration because many quantitative information about the solution can be obtained from this value.

Mass of Solute from Molarity

From the molarity of a solution, the equivalent mass of the solute used to prepare the solution may be obtained with the use of the formula mass (or molecular mass) through the equation:

[tex]molarity = \frac{\frac{mass\ of \ solute}{formula \ mass}}{volume \ of \ solution}\\\\mass \ of \ solute \ = molarity \times \ volume \ of \ solution \times formula \ mass[/tex]

Number of Representative Particles from Molarity

Moreover, the number of molecules of solute present in the solution may also be obtained using the molarity and Avogadro's number.

[tex]molarity = \frac{moles \ of \ solute}{volume \ of \ solution}\\\\no. \ of \ representative \ particles \ = molarity \times volume \times 6.022 \times 10^{23} \ representative \ particles[/tex]

For this problem, the mass of the solute dissolved in the solution and the number of sucrose molecules may be obtained from the molarity of the solution.

Mass of Sucrose

[tex]mass \ of \ sucrose \ = 0.1 \ \frac{mol}{L} \times 1 \ L \times \frac{342 \ g \ sucrose}{1 \ mol}\\\\\boxed {\boxed {mass \ of \ sucrose = 34.2 \ g \ sucrose}}[/tex]

Number of Sucrose Molecules

[tex]no. \ of \ sucrose \ molecules \ = 0.1 \frac{mol}{L} \times 1 \ L \times \frac{6.022 \times 10^{23} \ sucrose \ molecules}{1 \ mol}\\\\\boxed {\boxed {no. \ of \ sucrose \ molecules \ = 6.022 \times 10^{22} \ molecules}}[/tex]

Keywords: molarity, molar concentration

One litre of a freshly prepared 0.1 M sucrose solution means that 34.2 g of sucrose is dissolved in water to get final 1 L solution.

Further Explanation:

Concentration

It is a term that is used to relatedifferent components of solution with each other. A variety of concentration terms are employed to attain this. Some of the concentration terms are mentioned below.

1. Molarity (M)

2. Mole fraction (X)

3. Molality (m)

4. Parts per million (ppm)

5. Mass percent ((w/w) %)

6. Volume percent ((v/v) %)

7. Parts per billion (ppb)

Molarity is defined as moles of solute present in one litre of solution. It is represented by M and its unit is mol/L. The expression for molarity of solution is as follows:

[tex]{\text{Molarity of solution}} = \dfrac{{{\text{Moles }}\left( {{\text{mol}}} \right){\text{of solute}}}}{{{\text{Volume }}\left( {\text{L}} \right){\text{ of solution}}}}[/tex]

We are provided with 0.1 M sucrose solution. According to the definition of molarity, this indicates that 0.1 moles of sucrose are dissolved in 1 L of the solution.  

The formula to calculate the moles of sucrose is as follows:

[tex]{\text{Moles of sucrose}} = \dfrac{{{\text{Mass of sucrose}}}}{{{\text{Molar mass of sucrose}}}}[/tex]                                            …… (1)

Rearrange equation (1) for mass of sucrose.

[tex]{\text{Mass of sucrose}} = \left( {{\text{Moles of sucrose}}} \right)\left( {{\text{Molar mass of sucrose}}} \right)[/tex]                  …… (2)

Substitute 0.1 mol for moles of sucrose and 342 g/mol for molar mass of sucrose in equation (2).

[tex]\begin{aligned}{\text{Mass of sucrose}} &= \left( {{\text{0}}{\text{.1 mol}}} \right)\left( {{\text{342 g/mol}}} \right) \\&= {\text{34}}{\text{.2 g}} \\\end{aligned}[/tex]  

Therefore 34.2 g of sucrose is dissolved in water to get final 1 L solution.

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Answer details:

Grade: Senior School

Subject: Chemistry

Chapter: Concentration terms

Keywords: concentration, concentration terms, solutions, molarity, molality, sucrose, moles, mass, molar mass, 342 g/mol, 34.2 g, 0.1 M, mass of sucrose.

Answer:

Electron.

Explanation:

According to modern atomic theory, the electron position is not considered to be discrete  or fix. We say that there is probability of finding electron in particular area around the nucleus. so this we call as that atom is a diffuse cloud of electrons surrounding a small dense nucleus.

The electron density is maximum in shells.

The modern atomic theory states that the atom is a diffuse cloud of electrons surrounding a small, dense nucleus.

The correct answer is (A) electron.

Modern atomic theory states that the atom is a diffuse cloud of electrons surrounding a small, dense nucleus. The electrons are negatively charged particles that orbit the nucleus in specific energy levels or shells. This model of the atom was proposed by Niels Bohr in 1913 and is known as the Bohr model.

For example, in a hydrogen atom, there is one electron orbiting the nucleus. In oxygen, there are eight electrons arranged in two energy levels, with two in the first level and six in the second level.

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An atom of magnesium-26 has 12 protons and 14 neutrons. The number of protons is determined by the atomic number of magnesium (12). The number of neutrons is calculated by subtracting the atomic number from the mass number (26 - 12 = 14).

For an atom of magnesium-26 (26Mg), you need to understand its atomic structure. The atomic number of magnesium is 12, which states that a magnesium atom always contains 12 protons in its nucleus. This number defines the identity of an element and is always constant.

Magnesium-26 refers to an isotope of magnesium, where 26 represents the mass number. The mass number is the addition of the protons (p) and the neutrons (n) in an atom. In the case of magnesium-26, we already know there are 12 protons. Subtract the atomic number (number of protons) from the mass number to get the number of neutrons. That is, 26 - 12 = 14 neutrons.

So, an atom of magnesium-26 (26Mg) has 12 protons and 14 neutrons.

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1) the basic unit of mass (SI unit) is Kg

2) the amount of matter in an object is known as density, infact the amount of matter in a unit volume is density

3) We can measure the mass with a balance

Burette: for volume

rule : for length

graduated cylinder : for volume

4) Weight is measure of force of gravity on a matter

5) the density of water = 1 g / mL at 4 C

so mass of 1 mL of water will be equal to 1 gram

The answer is :

H2

because a compound is made up of 2 or more elements.

Explanation:

An element is a substance that is made uniquely from one type of atom. For example, the element hydrogen is produced from atoms comprising a single proton and a single electron. If you change the number of protons an atom has, you develop the type of element it is.

Answer:

H₂ can be classified as an element.

Explanation:

An element is defined as a substance with only one kind of atom.

H₂ is a substance that only has one kind of atom: hydrogen.

NO₃ is a substance that has two kind of atoms: nitrogen and oxygen.

NaCl is a substance that also has two kind of atoms: sodium and chlorine.

H₂SO₄ is a substance that has three kind of atoms: hydrogen, sulphur and oxygen.

Thus, H₂ can be classified as an element.

I hope it helps!

The mass number of an atom with 82 protons and 125 neutrons is 207. The mass number is calculated by adding the number of protons and neutrons, not considering electrons because they are much lighter and don't contribute significantly to an atom's mass. The atom described is a positively charged ion due to the imbalance between protons and electrons.

An atom with 82 protons, 125 neutrons, and 78 electrons will have a mass number of the sum of its protons and its neutrons. The mass number won't include the number of electrons because electrons are much lighter and do not significantly contribute to the total mass of an atom.

Therefore, the mass number of an atom with 82 protons and 125 neutrons is 82 + 125 = 207.

This atom would be an ion because the number of protons (which define the atomic number) and electrons are not equal. In this case, the atom has more protons than electrons, so it's a positively charged ion.

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The hydrogen bonds are completely destroyed and their number reduces in a particular volume of water as water molecules are heated up.

The interactions between neighbouring molecules of water containing one hydrogen and two oxygen atoms are the hydrogen bonds of water.

In all its 3 states, water has totally different chemical characteristics. This is due to hydrogen bonding between molecules of water. In a liquid state, hydrogen bonds are constantly formed and broken due to high kinetic energy. The kinetic energy is high due to the moderately high temperature of liquid water.

When the temperature of the water is raised further, the kinetic energy of the molecules of water will also increase. At a high value of kinetic energy, the speed of motion of water molecules will also be extremely high resulting in the breaking of hydrogen bonds.

At a particular increase in the temperature, all the hydrogen bonds between the water molecules will be broken and water will turn to steam. This temperature is called the boiling point of water.

Therefore, the hydrogen bonds are broken and their amount is reduced when the temperature of the water is increased.

Read more about hydrogen bonds, here

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