Question

A cylinder if fitted with a floating piston oriented horizontally (the gas is the system and by having a floating piston it maintains constant pressure).

It contains 26.0 L of argon at 30.0C and 1 bar pressure. The system is then heated to 300.0C.

Argon can be considered a monatomic gas and therefore would have a Cv = 3R/2, where R is the ideal gas constant. Also for gases Cp = Cv +R. (pay attention to the units).

If you make assumptions to solve they must be consistent with this information given (for example: do not look up a new specific heat for air, different than what I defined it as).  

How much argon is in the system (in moles)?

What is the change in kinetic energy (in J)?

What is the change in potential energy (in J)?  

What is the change in internal energy (in J)? Need correct sign

What is the change in enthalpy (in J)? Need correct sign

How much work was done (in J)? Need correct sign

How much heat was transferred (in J)? Need correct sign

Answer 1

DEAR STUDENT, SIGNS FOR Q AND W MAY CHANGE BASBASED UPON I LAW FORMULA FORM USED. FOR Q=DELTA U + W, Q IS POSITIVE WHEN HEAT IS SUPPLIED TO SYSTEM AND W IIS POSITIVE WHEN WORK IS DONE BY SYSTEM. HOWEVER, FOR DELTA U = Q+W, W IS POSITIVE WHEN WORK IS DONE ON SYSTEM. KINDLY CONSIDER IT.

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