For all following process ,fill all blank with either +,- or 0
q w ΔU ΔH
a.Melting of ice at 0。C and 1 atm. + +
b.Compress of an ideal gas rev and adibatically. 0 + + +
c.cooling of and ideal gas rev at constant Press.- + - -
d.Free expansion of an ideal gas into twice the 0 0 0 0
volume in a closed adiabatic box.
e.An ideal gas expands adiabatically against 0 + - +
external press of 1 atm.
f.An ideal gas expands isothermally against - + 0 0
external press of 1 atm.
g.An ideal gas expands adiabatically into vacuum.0 0 0 0
h.A liquid at its boiling point is converted rev + - + +
into its vapor at constant T.P
以上煩請指正
比較不確定的是 A 及 H
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