Is partial molar volume the same as molar volume?

The partial molar volume of a pure substance is the same as the molar volume, so we can simplify the notation by using V∗A and V∗B instead.

What do you mean by partial molar volume?

In general, the partial molar volume of a substance X in a mixture is the change in volume per mole of X added to the mixture. The partial molar volumes of the components of a mixture vary with the composition of the mixture, because the environment of the molecules in the mixture changes with the composition.

What is the difference between partial molal volume and apparent molal volume?

How the total volume of a solution V depends on the volume of the pure solvent and the apparent molal volume of the solute φV. The apparent molal volume differs from the partial molal volume in that for the partial molal volume, the volume effects are divided between the solute and the solvent.

Why do molar volumes differ?

With liquids and solids, volume varies greatly depending on the density of the substance. This is because solid and liquid particles are packed close together with very little space in between the particles.

Why is partial molar volume important?

Partial molar volume is an important thermodynamic property that gives insights into molecular size and intermolecular interactions in solution.

Why does partial molar volume vary with concentration?

The partial molar volumes are found to increase with increasing temperature over the entire concentration range investigated in a given mixed solvent medium whereas these values are found to decrease as the relative permittivity of the medium decreases.

Why is the molar volume for all gases approximately equal?

As all gases that are behaving ideally have the same number density, they will all have the same molar volume. At STP this will be 22.4 L. This is useful if you want to envision the distance between molecules in different samples.

Why do different gases have the same volume?

Because of the variation in gas volume due to pressure and temperature changes, the comparison of gas volumes must be done at standard temperature and pressure. Standard temperature and pressure (STP) is defined as 0oC (273.15K) and 1atm pressure. The molar volume of a gas is the volume of one mole of a gas at STP.

Do different gases have different volumes?

The molar volumes of all gases are the same when measured at the same temperature and pressure.