Assume you have 1mole of liquid methane which you

Assume you have 1mole of liquid methane which you

Assume you have 1mole of liquid methane which you

Assume you have 1mole of liquid methane which you have held as the liquid while raising the temperature from -200°C to 0°C (note the warming of the liquid is not part of the problem). You release the pressure and the methane flash boils to methane gas at 0°C. Important constants: ∆vapH°=8.17kJ/mol, Tb=-161.5°C, Cp=35.69J/moleK(gas), Cp=52.93J/moleK(lq) (source: http://en.wikipedia.org/wiki/Methane_%28data_page%29)Calculate ∆Ssys, ∆Ssurr and ∆Suniv for the flash boilCalculate ∆Ssys, ∆Ssurr and ∆Suniv for boiling methane at -161°C.Why are these different for these two processes?

 

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