Calculating the Amount of Lauric Acid Dispersed on Water Surface

In summary, the problem is to calculate the amount of lauric acid that was dispersed on a water surface with an area of 500 cm2. The acid molecules have a cross-sectional area of 18.2 square angstroms and a density of 0.78 g/cm3. To solve this, you need to determine the minimum amount of lauric acid needed to cover the surface, assuming it can be described by a sphere with a radius of √(18.2/∏) in angstroms. Then, find the best packing fraction for a single layer array of these spheres on a surface and count them for 500 cm2.
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Homework Statement


Lauric acid , CH3(CH2)10CO2H has been dispersed 500cm2+ on the water surface. Assume that the cross-sectional area of acid molecule to be 18.2A2+ and the density of the initial acid is 0.78gcm3-, calculate the amount of acid that dispersed on the surface of water.

* the problem i face is, i don't know how to find number of moles of lauric acid...
please some one help me...


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The Attempt at a Solution

 
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You need to determine the minimum amount of lauric acid that will cover the surface of area 500 cm2. Each molecule has a cross sectional area of 18.2 square angstroms. Assume the lauric acid can be described by a sphere of radius √(18.2/∏) in angstroms. Find out the best packing fraction that a single layer array of spheres covering a surface would be and count them for 500 cm2.
 

Related to Calculating the Amount of Lauric Acid Dispersed on Water Surface

1. How do you calculate the amount of Lauric Acid dispersed on a water surface?

The amount of Lauric Acid dispersed on a water surface can be calculated by dividing the mass of the Lauric Acid by the surface area of the water. This will give you the concentration of Lauric Acid on the surface in units of mass per unit area.

2. What is the formula for calculating the surface area of water?

The formula for calculating the surface area of water is A = πr², where A is the surface area and r is the radius of the water body. If the water surface is not circular, you can estimate the surface area by dividing it into smaller, regular shapes and using their respective area formulas.

3. Why is it important to calculate the amount of Lauric Acid on the water surface?

Calculating the amount of Lauric Acid on the water surface is important because it can help us understand the behavior and distribution of this chemical in water systems. It can also provide information on the potential effects of Lauric Acid on aquatic organisms and the environment.

4. How can you measure the mass of Lauric Acid on the water surface?

The mass of Lauric Acid on the water surface can be measured using a variety of techniques such as gravimetric analysis, liquid-liquid extraction, and spectrophotometry. These methods involve collecting a sample of the water and analyzing it in a laboratory setting.

5. Is the amount of Lauric Acid on the water surface constant?

No, the amount of Lauric Acid on the water surface is not constant. It can vary depending on factors such as the concentration of Lauric Acid in the water, temperature, and the presence of other substances that may interact with the Lauric Acid. It is important to measure the amount of Lauric Acid at different time points to accurately assess its behavior on the water surface.

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