Helium at 300C and 200 kPa, in a closed container, is cooled to a pressure of 100

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Helium at 300°C and 200 kPa, in a closed container, is cooled to a pressure of 100 kPa. Estimate
(a) The new temperature, in °C; and
(b) The change in entropy, in J/(kg⋅K).
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