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One mole of water vapor undergoes reversible isothermal expansion from 1.00 L to 10.00 L at...

One mole of water vapor undergoes reversible isothermal expansion from 1.00 L to 10.00 L at 250C. Calculate the amount of work performed if (a) the gas behaves ideally, and (b) the gas obeys the van der Waals equation with constants a = 5.54 dm6 bar mol-2 and b = 0.031 dm3 /mol

please show all the step so I can understand

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