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Thermodynamics 10 Online
OpenStudy (anonymous):

A 60 watt light bulb is used to heat a gas cylinder for 2.0 min. The gas expands by 12.4 L against an external pressure of 1.8 atm. What is delta U, the change in the internal energy of the gas? (1 watt = 1 J s^-1) The answer is 4.9 x 10^3 J, I just don't know how to set up the problem.

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