Posted by mel on Monday, November 26, 2007 at 5:31pm.
q = mass He x specific heat He x (Tf - Ti) where Tf is final T and Ti is initial T. mass He is 22.3 mol and Cp is 20.8 J/mol*c. Solve for q.
work = -p(delta V) = -p(V2 - V1)
V2, V1, and p are given. Solve for work. Work will be in L*atm so multiply what you get by 101.3 J/1 atm to convert to Joules.
Delta E = q + w.
Post your work if you get stuck.
for q i got 70538.931
for w i got 7091
and for the change i got 77629.931
the last one was worng, are they all wrong?
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