Answers
Wattage of bulb = 100 W = 100 J/s
time = 2.0 x 10-2 hr
time = 2.0 x 10-2 hr * (3600 s / 1 hr)
time = 72 s
(a) Change in internal energy, U = (wattage of bulb) * (time)
U = (100 J/s) * (72 s)
U = 7200 J
(b) Work = pressure * (initial volume - final volume)
work = (1.0 atm) * (0.85 L - 5.88 L)
work = -5.03 atm-L
work = -5.03 atm-L * (101.325 J / 1 atm-L)
work = -510 J (negative sign indicates work is done by the system)
(c) According to first law of thermodynamics,
U = q + w
where U is the change in internal energy = 7200 J
q = heat gained by system
w = work done on system = -510 J
substituting the values,
7200 J = q + (-510 J)
q = 7200 J + 510 J
q = 7700 J
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