1. The temperature of a sample of dilute argon gas with n =7.5 moles decreases by 200 K. If 35,000 J of heat are extracted from the gas, what is the work done by the gas on its surroundings?
2. One gallon of gasoline releases approximately 1.2 ×108 J when it is “burned” (i.e., undergoes combustion) in a car engine. If the engine releases 4.0 ×107 J of heat during this time, what is the mechanical work done by the engine?
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