Graham’s law equation

What does Graham’s law state?

Graham’s Law of Diffusion The rate at which gases diffuse is inversely proportional to the square root of their densities.

How do you calculate the rate of diffusion?

The rate of diffusion, dn/dt, is the change in the number of diffusing molecules inside the cell over time. Since the net movement of diffusing molecules depends on the concentration gradient, the rate of diffusion is directly proportional to the concentration gradient (dC/dx) across the membrane.

How was Graham’s law discovered?

This result is known as Graham’s law of diffusion after Thomas Graham (1805 to 1869), a Scottish chemist, who discovered it by observing effusion of gases through a thin plug of plaster of paris. Calculate the relative rates of effusion of He(g) and O2(g) .

Which gas diffuses the fastest?

hydrogen gas

How does size affect the rate of diffusion?

When the cell increases in size, the volume increases faster than the surface area, because volume is cubed where surface area is squared. When there is more volume and less surface area, diffusion takes longer and is less effective. this is actually why cells divide.

What is concentration gradient?

A concentration gradient occurs when the concentration of particles is higher in one area than another. In passive transport, particles will diffuse down a concentration gradient, from areas of higher concentration to areas of lower concentration, until they are evenly spaced.

What is rate of diffusion measured in?

What is diffusion rate? A rate is a quantity expressed per unit of time. For example, the speed you travel in your automobile is a rate, e.g., 80 miles/hour. So, diffusion rate is expressed as the amount of salt moved per time, e.g., 0.1 moles/sec.

Why is Graham’s law important?

Graham’s law provides a basis for separating isotopes by diffusion—a method that came to play a crucial role in the development of the atomic bomb. Graham’s law is most accurate for molecular effusion which involves the movement of one gas at a time through a hole.

Why does molecular weight affect diffusion?

Mass of the molecules diffusing: Heavier molecules move more slowly; therefore, they diffuse more slowly. The reverse is true for lighter molecules. Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion.

What is the molecular mass of co2?

44.01 g/mol

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Who created Graham’s law?

Thomas Graham

What is RMS velocity?

RMS Velocity The root-mean square (RMS) velocity is the value of the square root of the sum of the squares of the stacking velocity values divided by the number of values. The RMS velocity is that of a wave through sub-surface layers of different interval velocities along a specific ray path.

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