What does molecular weight depend on?

The weight average molecular weight depends not only on the number of molecules present, but also on the weight of each molecule.

What determines the molecular weight?

The molecular weight is the sum of the atomic weights of the atoms in the molecule. We can go about our calculation by making a table. We then take the atomic weight of the atoms from the periodic table. For hydrogen, the atomic weight is 1.00794, and for oxygen it is 15.9994.

Does molecular weight vary?

The molecular mass (m) is the mass of a given molecule: it is measured in daltons (Da or u). Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.

Does molecular weight change with mass?

Moreover, the main difference between both is that molar mass gives the mass of a mole of a particular substance. Whereas molecular weight is the mass of a molecule of a particular substance. While the definition and units are different for molar mass and molecular weight, the value is the same.

Why is molecular weight important?

Why is Molecular Weight Important in Polymers? As the molecular weight increases, mechanical properties generally increase. Every polymer has an ideal molecular weight at which the balance of different properties (such as processability, strength, brittleness etc.) is optimized.

How do the molecular weights of elements affect the manufacturing of materials?

A High molecular weight increases the impact resistance of the material. A High molecular weight increases the viscosity of the material – makes it harder to process the material using conventional methods. The longer the chains, the harder it is to get them to flow because they are more tangled.

How does molecular weight differ from atomic weight?

The key difference between atomic mass and molecular weight is that the atomic mass is the mass of a single atom whereas the molecular weight is the sum of the weights of the atoms in the molecule.

What are the properties which will change when molecular weight increases?

In general, as molecular weight increase the strength, toughness and chemical stress crack resistance increase. Lower molecular weight will typically flow easier. A High molecular weight increases the impact resistance of the material.

How can any difference between the molecular weight of the protein and its predicted molecular weight be explained?

The size of the protein can be determined through separation by electrophoresis – smaller proteins migrate faster than their larger counterparts. The calculated (or predicted) molecular weight of a protein is determined by adding the actual molecular weights of individual amino acids in a given protein.

Are molecular mass and molecular weight the same?

Molecular mass and Molecular weight is not the same, although they use interchangeably. Molecular weight, as a synonym of molar mass, is defined as the mass of a sample of that compound divided by the amount of substance in that sample, measured in moles (g/mol).

How does molecular weight relate to the size of a molecule?

Molecular weight is the mass of an individual molecule, specifically the mass of material required to make a single mole. Molecular size relates to the physical size of an individual molecule.

How does molecular weight affect absorption?

As the MW increases, the absorption decreases.

What is the difference between molecular mass and molecular weight?

Molecular weight is often used interchangeably with molecular mass in chemistry, although technically there is a difference between the two. Molecular mass is a measure of mass and molecular weight is a measure of force acting on the molecular mass.

Is molecular mass independent of phase and temperature?

Molecular or atomic mass ( don’t use the old weight term) is independent of phase or temperature. It is a fundamental property of the atoms. You are also confusing the terms atomic mass and molecular mass in the text of your question. Atomic mass applies to single atoms of an element, molecular mass applies to molecules such as the water molecule.

Does the molecular weight of a substance change with temperature?

No, molecular weight is absolute. What changes with temperature is density, how many molecules of a substance occupy a given volume at a given temperature. Molecular Weight (or mass, more correctly) should not change except very mildly with isotopic transformations.

What is the relationship between mass mass and density?

Density of a quantity of matter is its mass divided by its volume. The mass of an object depends on the atomic mass of the individual atoms or molecules and the how close the they are compressed together.