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Not exactly, although they can be. If two molecules are both composed of the same elements, the one that has more atoms in it, the one with more atoms will have a larger molecular mass, and a larger molecular size. However, different elements weigh different amounts.
Take for example the molecule octane, which is an ingredient in gasoline, with formula C8H18. Octane is relatively large, and has a molecular mass of approximately 114 grams per moles. However, a single atom of the element lead, Pb, is much smaller than the molecule octane, and yet the molar mass of lead is 207.2 grams per mole! So it is much heavier, and yet smaller.
On the other hand, hydrogen gas (H2) has a molar mass of 2 grams per mole, and chlorine gas (Cl2) has a molar mass of 71 grams per mole, and Cl2 is indeed much larger than H2.
And so you can see that it depends on the composition of the things you are comparing.
What else can I help you with?
Effect of molecular size on diffusion?
In general, larger molecules diffuse more slowly than smaller molecules because they have a larger molecular weight and therefore experience more resistance from the surrounding medium as they move. This is due to the fact that larger molecules have a lower diffusion coefficient and therefore diffuse at a slower rate. Additionally, larger molecules may also be more prone to interacting with other molecules in their surroundings, further slowing down their diffusion.
Rate of diffusion and thickness of membrane?
The rate of diffusion is inversely proportional to the thickness of the membrane. Thinner membranes allow for faster diffusion of molecules across the membrane due to shorter distances to travel. This relationship is described by Fick's Law of Diffusion, which states that the rate of diffusion is directly proportional to the surface area of the membrane and the concentration gradient.
How does molecular size affect diffusion rate?
Rate of diffusion is indirectly proportional to the molecular mass. This means that for a heavier particle, (i.e, higher molecular mass), the rate of diffusion is slower because they would have to travel the same distance with more energy compared to smaller molecules. Imagine a fat man trying to run and a slimmer man, the fat man would require more energy.Read more: What_is_the_relationship_between_the_rate_of_diffusion_and_the_molecular_mass_of_a_substance
What is diffusion rate proportional to?
rate of diffusion depends on the concentration gradient, surface area, distance over which diffusion takes place, size and nature of the diffusing molecule.
The rate of diffusion through a semipermeable membrane will be lowest when?
The rate of diffusion through a semipermeable membrane will be lowest when temperatures are low. Lower temperatures decrease the energy of the molecules, which in turn decreases the rate of diffusion.
Relationship between gas's molecular weight and speed of effusion?
Higher is the molecular mass lower is the rate of effusion, when mass increases by 4 times rate decreases to one half (Graham's law of diffusion).
What is the relationship between surface area to volume ratio and the rate of diffusion?
The higher the ratio, the faster the rate of diffusion
What is the relationship between mass and rate of diffusion?
Molecular weight and diffusion are inversely related. The heavier the molecule, the slower the rate of diffusion.Related Information:This means that for heavier molecules, (i.e, higher molecular mass substances), the rate of diffusion is slower, because the available energy can't move them as quickly as the smaller molecules over the same distance.Analogy: Imagine the difference between having to carry an empty bucket up a ladder, and then one filled with sand. With highest effort, it would take longer to carry the bucket filled with sand to the top of the ladder, than it would the empty one.
Effect of molecular size on diffusion?
In general, larger molecules diffuse more slowly than smaller molecules because they have a larger molecular weight and therefore experience more resistance from the surrounding medium as they move. This is due to the fact that larger molecules have a lower diffusion coefficient and therefore diffuse at a slower rate. Additionally, larger molecules may also be more prone to interacting with other molecules in their surroundings, further slowing down their diffusion.
What influences the rate of diffusion?
The rate of diffusion is influenced by the concentration gradient, temperature, molecular size, and the medium through which the particles are diffusing. A steeper concentration gradient, higher temperature, smaller molecular size, and a less dense medium all tend to increase the rate of diffusion.
What is the effect of the density of liquid on the rate of diffusion?
The increase in density will decrease the rate of diffusion. There is an inverse relation between density and rate of diffusion.
The rate of diffusion depends on?
The rate of diffusion depends on the concentration gradient, temperature, molecular weight, and surface area available for diffusion. A steeper concentration gradient, higher temperature, smaller molecular weight, and larger surface area all contribute to faster rates of diffusion.
Which pair of gas has same rate of diffusion at STP?
Hydrogen and helium have the same rate of diffusion at standard temperature and pressure (STP) due to their similar molecular weights and sizes.
What three things can affect the rate of diffusion?
Diffusion refers to the process where substances from a highly concentrated area move to a place with a lower concentration. The three factors that affect the rate of diffusion are temperature, concentration gradient and the molecular weight of the substances.
How does surface area to volume ratio of a cell affect rate of diffusion?
The surface area to volume ratio of a cell affects the rate of diffusion in that the higher the ratio, the faster the rate of diffusion. This is a directly proportional relationship.
How does pressure affect the rate of diffussion?
Higher pressures cause more molecular collisions which in turn causes a greater rate of diffusion. The opposite is also true - lower pressures cause a decreased rate of diffusion.
How would describe the relationship between concentration of dye and the rate of diffusion?
The rate of diffusion is directly proportional to the concentration of dye. Higher concentration gradients result in faster diffusion rates, as molecules move from areas of high concentration to low concentration in an attempt to reach equilibrium.
