1. (a) If you add 20 J of heat to a system at −20°C, what is the change in its entropy?
(b) By what factor does the number of states accessible to the system increase?
2. Three hundred grams of aluminum are heated from −50 °C to 300 °C. If the specific heat of aluminum is 0.88 J/(g °C), what is the change in entropy of the aluminum?
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