A) would you expect deviation freom the pressure - valume cinstant to be larger

Question

A) would you expect deviation freom the pressure - valume cinstant to be larger at higher or low pressure

b) Do expermenttal result verify this expeatation

Section Date Data Sheet 1 ll. Changing the Flask Volume and Measuring the Dibutyl Phthalate column Height first determination volume of water needed to fill flask, mL radius of capillary tubing, cm length of tubing below stopper, cm volume occupied by tubing, cm corrected volume of flask, ml. room temperature, C room temperature, K barometric pressure, in. Hg barometric pressure, cm Hg barometric pressure, cm dibutyl phthalate PV height of dibutyl system corrected flask Syringe cm mL. ml. volume, ml. phthalate column, cm pressure, cm volume, volume, mL 45.0 40.0 30.0 25.0 20.0 15.0 10.0 average PV, cm mL

Explanation / Answer

Well, at low pressure the gas tends to behave ideally. The assumptions of kinetic theory of gases that the molecules of gas occupy negligible volume and also they have no forces of attraction between molecules is true at low pressure.

But, as we move to higher pressures and the gas is compressed, then the total volume occupied by molecules of the gas is now not insignificant and thus we need to account for the volume occupied by molecules.

When the gas is compressed, the molecules of the gas come close to each other and have some forces of attraction between them.

So, to summarize at high pressure gases deviate from ideal behaviour and we see a large deviation for pressure volume constant

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