Posted by mel on Monday, November 26, 2007 at 5:31pm.
A balloon filled with 22.3 mol helium has a volume of 500. L at 0.0°C and 1.00 atm pressure. The temperature of the balloon is increased to 38.0°C as it expands to a volume of 570. L, the pressure remaining constant. Calculate q, w, and E for the helium in the balloon. (The molar heat capacity for helium gas is 20.8 J/°C·mol.)

chem  DrBob222, Monday, November 26, 2007 at 10:39pm
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.
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