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15 mol /h of stream 1 (gas, at 1.1 atm and 0°C) containing 25% (mol basis)...

15 mol /h of stream 1 (gas, at 1.1 atm and 0°C) containing 25% (mol basis) propane and rest butane is mixed with a second stream (gas, at 1.1 atm and 70°C) containing 40% (mol basis) propane and rest butane. The output stream is 40 mol/h (gas, at 1.1 atm). The relative enthalpies as a function of temperature (T is in °C) are H (J/mol) for propane= 91*T H (J/mol) for butane= 121*T a) What is the composition of the output stream? b) What is the temperature of the output stream, assuming no heat exchange with the surrounding?

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