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What information is derived by the shape...

What information is derived by the shape of the graph given for a fixed mass of gas?

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The graph PV/T versus T is a straight line parallel to the temperature axis.
A jump in the curve at increased temperature denotes the change of composition.
The number of moles of the gas may be increased due to dissociation. For example the dimer of nitrogendioxide decomposes to its monomer.
` underset(1 " mole")(N_2 O_(4 (g))) to underset("2 moles")(2NO_(2(g))`
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