Question

explain the pv isotherm of co2 an derive correlations between critical constant and van der Waals constant.
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Answer 1

Explanation:

The state of a given amount of any substance can be described by three parameters: pressure p, volume V, and temperature T. These parameters are related to each other. Their relationship is described by the equation of state, which in the general case has the form:

F(p,V,T)=0.

The specific form of the equation depends on the substance. For example, a rarefied gas at a sufficiently high temperature is well described by the ideal gas model. Its equation of state is the well-known ideal gas law stated by Emile Clapeyron (1799−1864) in 1834:

pV=mMRT.

Here m is the mass of the gas, M is the molar mass (i.e. the mass of one mole of the gas), R is the universal gas constant. For one mole of gas, this equation takes the following form:

pV=RT.

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