# Explain the relationship between rate of diffusion and molecular weight

### What is the relationship between molecular weight and rate of diffusion? | Socratic The Relationship between the Molecular Weight, Time and Rate of Diffusion of affect the rate of diffusion of substances; and 2. to explain the possible effects of. Why Does the Rate of Diffusion Vary With Molecular Weight & Temperature? of the molecules times the average distance they travel between collisions, called. Molecular weight will affect the rate of diffusion. All other things being constant, lighter weight molecules will move faster or diffuse faster that heavier molecules.

Consequently, the study means that the rate of diffusion is inversely proportional to the size of the particle of the substance i. The validity that the molecular weight of a substance has an effect on its rate of diffusion was derivative from the glass tube set-up. At the same manner, the agar-water gel test is used to assess and verify the same matter. This study aimed to determine the effect of molecular weight and time on the rate of diffusion of substances via the glass tube test and agar-water gel test.

The specific objectives were 1. For the first set up, two feet glass tube was fastened horizontally to a ring strand, as shown in Figure 1.

Using fine forceps, two cotton balls of the same size were moistened, one with Figure 1. One end of the tube was then plug with one wet cotton ball and the other end with the other cotton ball. After some time, a white smoke appeared. The distance of the white smoke to each of the cotton balls was obtained by measuring its length, comparing each measurement and then getting the total distance and average ratio of the diffusion of the substances. A graph comparing the distance of the substances with that of the white smoke was then plotted and analyzed.

For the next set up, a petri dish of agar-water gel with three wells was obtained. The three wells were labeled as follows: Each well was placed with one drop of the prepared solution of each substance. The petri dish was then immediately covered and the diameter in mm. At a regular five-minute interval for thirty minutes, the diameter of the colored area of each substance was measured and recorded, as shown in Figure 3. A graph comparing the distance of each interval to its original position was also plotted and analyzed.

The position of the substances at zero minute. The position of the substances after 30 minutes.

### What is the relationship between the rate of diffusion and the molecular mass of a substance

Computing for the ratio of the substances by simply getting the proportion of NH 3 and HCl, the average ratio would be 1. This implies that NH3 have diffused faster than HCl. Since the gaseous molecules of NH3 diffused at a faster rate, it reached the opposite side of the glass tube reacting with HCl wherein the white smoke formed.

As shown in Table 2, a record of the measurements of the diameter of the substances per interval was recorded and was analyzed. Distance of each substances from each well per interval. Then, the average of the computed partial rates of each substance was obtained to get the average rate of diffusion. Showing that KMnO 4 diffused faster that the other substances. Methylene blue, having the highest molecular weight diffused slower in respect with the other substances. In Figure 4, the average rate of diffusion of each substance against its molecular weight was plotted. As well as the partial rate of diffusion of each substance against the time elapsed was plotted in Figure 5.

In accordance to the hypothesis, the experiment showed how the rate of diffusion of a substance was affected by its molecular weight. To find the molecular weight also called the molecular mass or molar mass of a compound or chemical, you need two things: The molecular formula tells you how many atoms of each element is present in the compound.

### How does molecular weight affect the rate of diffusion? | Socratic

To find the molecular weight, just add up the atomic weights of each element present in the compound, being sure to multiply by the number of times that atom appears. The atomic weight of each element is found on a periodic table. Relation between rate of diffusion and molecular weight?

Rate of diffusion is indirectly proportional to the molecular mass. This means that for a heavier particle, i. Imagine a fat man trying to run and a slimmer man, the fat man would require more energy.

## What is the relationship between molecular weight and rate of diffusion?

It can be fast if molecule is small or slow if molecule is large. What is the relationship between the formula mass of the substance and its molar mass?

I am doing my chemistry homework now, and that's on of the questions, so if someone could provide an answer Example for hydrochloric acid: As temperature increases, the kinetic energy of the molecules increases, so the rate of diffusion also increases.

What is the relationship between rate of diffusion and cell size?