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How many spherical colloidal oil particles 20A in radius can be from a spherical oil drop whose radius is 2 microns? If molar mass of this oil is 150 u how many molecules are present in one particle of radius 20A?
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How many spherical colloidal oil particles 20A in radius can be from a...
Calculation of Number of Colloidal Oil Particles

Given that the radius of the spherical oil drop is 2 microns.

We know that the volume of a sphere is given by the formula:

V = (4/3)πr^3

Where r is the radius of the sphere.

The volume of the oil drop is:

V1 = (4/3)π(2μm)^3 = 33.51 μm^3

The volume of each colloidal oil particle is:

V2 = (4/3)π(20A)^3 = 3.351×10^-17 μm^3

The number of colloidal oil particles that can be formed from the oil drop is:

N = V1/V2 = 9.99×10^23

Therefore, the number of colloidal oil particles that can be formed is approximately 9.99×10^23.

Calculation of Number of Molecules in One Particle

Given that the molar mass of the oil is 150 u.

We know that the number of molecules in one mole of a substance is given by Avogadro's number (6.022×10^23).

The number of molecules in one particle of radius 20A can be calculated as follows:

- Calculate the mass of one particle:

The density of the oil is required to calculate the mass of one particle. Let's assume the density to be 0.9 g/cm^3.

The mass of one particle is:

m = ρV2 = 2.99×10^-17 g

- Calculate the number of moles of the oil in one particle:

The number of moles of the oil in one particle is:

n = m/M = 1.99×10^-19 mol

- Calculate the number of molecules in one particle:

The number of molecules in one particle is:

N = n×NA = 1.20×10^4

Therefore, the number of molecules in one particle of radius 20A is approximately 1.20×10^4.

Explanation

The above calculations involve basic formulas of geometry, physics, and chemistry. The number of colloidal oil particles that can be formed from the oil drop depends on the volume of the oil drop and the volume of each colloidal oil particle. The number of molecules in one particle depends on the mass of the particle, the molar mass of the oil, and Avogadro's number. These calculations are important in understanding the behavior and properties of colloidal systems.
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Read the passage given below and answer the following questions:Some colloids are stable by their nature, i.e., gels, alloys, and solid foams. Gelatin and jellies are two common examples of a gel. The solid and liquid phases in a gel are interspersed with both phases being continuous. In most systems, the major factor influencing the stability is the charge on the colloidal particles. If a particular ion is preferentially adsorbed on the surface of the particles, the particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. The ion can be either positive or negative depending on the particular colloidal system, i.e., air bubbles accumulate negative ions, sulphur particles have a net negative charge in a sulphur sol, and the particles in a metal hydroxide sol are positively charged. Accumulation of charge on a surface is not an unusual phenomenon-dust is attracted to furniture surfaces by electrostatic forces. When salts are added to lyophobic colloidal systems the colloidal particles begin to form larger aggregates and a sediment forms as they settle. This phenomenon is called flocculation, and the suspension can be referred to as flocculated, or colloidally unstable. If the salt is removed, the suspension can usually be restored to its original state; this process is called deflocculation or peptization. The original and restored colloidal systems are called deflocculated, peptized, or stable sols. Why does a small amount of salt have such a dramatic effect on the stability of a lyophobic colloidal system? The answer lies in an understanding of the attractive and repulsive forces that exist between colloidal particles. Van der Waals forces are responsible for the attractions, while the repulsive forces are due to the surface charge on the particles. In a stable colloid, the repulsive forces are of greater magnitude than the attractive forces. The magnitude of the electrical repulsion is diminished by addition of ionized salt, which allows the dispersed particles to aggregate and flocculate. River deltas provide an example of this behaviour. A delta is formed at the mouth of a river because the colloidal clay particles are flocculated when the freshwater mixes with the salt water of the oceanQ. The particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. This statement explains

Read the passage given below and answer the following questions:Some colloids are stable by their nature, i.e., gels, alloys, and solid foams. Gelatin and jellies are two common examples of a gel. The solid and liquid phases in a gel are interspersed with both phases being continuous. In most systems, the major factor influencing the stability is the charge on the colloidal particles. If a particular ion is preferentially adsorbed on the surface of the particles, the particles in suspension will repel each other, thereby preventing the formation of aggregates that are larger than colloidal dimensions. The ion can be either positive or negative depending on the particular colloidal system, i.e., air bubbles accumulate negative ions, sulphur particles have a net negative charge in a sulphur sol, and the particles in a metal hydroxide sol are positively charged. Accumulation of charge on a surface is not an unusual phenomenon-dust is attracted to furniture surfaces by electrostatic forces. When salts are added to lyophobic colloidal systems the colloidal particles begin to form larger aggregates and a sediment forms as they settle. This phenomenon is called flocculation, and the suspension can be referred to as flocculated, or colloidally unstable. If the salt is removed, the suspension can usually be restored to its original state; this process is called deflocculation or peptization. The original and restored colloidal systems are called deflocculated, peptized, or stable sols. Why does a small amount of salt have such a dramatic effect on the stability of a lyophobic colloidal system? The answer lies in an understanding of the attractive and repulsive forces that exist between colloidal particles. Van der Waals forces are responsible for the attractions, while the repulsive forces are due to the surface charge on the particles. In a stable colloid, the repulsive forces are of greater magnitude than the attractive forces. The magnitude of the electrical repulsion is diminished by addition of ionized salt, which allows the dispersed particles to aggregate and flocculate. River deltas provide an example of this behaviour. A delta is formed at the mouth of a river because the colloidal clay particles are flocculated when the freshwater mixes with the salt water of the oceanQ. When Van der Waals forces are greater than forces due to the surface charge on the particles,

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How many spherical colloidal oil particles 20A in radius can be from a spherical oil drop whose radius is 2 microns? If molar mass of this oil is 150 u how many molecules are present in one particle of radius 20A?
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