ThermodynamicsHard
Question
One mole of a non-ideal gas undergoes a change of state (2.0 atm, 3.0 L, 95 K) with a change in internal energy, (ᐃH) of the process in L-atm is :
Options
A.40.0
B.42.3
C.44.0
D.not defined, because pressure is not constant
Solution
By definition
H = U + PV (E = U)
or ᐃH = ᐃU + (P2V2 - P2V2)
ᐃH = 30 + (4 × 5 - 2 × 3)
= 30 + 14 = 44L - atm
Don′t use ᐃH = ᐃU + ᐃnRT because P is not constant.
H = U + PV (E = U)
or ᐃH = ᐃU + (P2V2 - P2V2)
ᐃH = 30 + (4 × 5 - 2 × 3)
= 30 + 14 = 44L - atm
Don′t use ᐃH = ᐃU + ᐃnRT because P is not constant.
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