A vacuum cleaner creates a negative air pressure of -20 kPa relative to the air outside the vacuum cleaner. Suppose 0.50 mol of a monoatomic ideal gas (Cv,m = 3/2 R) in a diathermic piston at 26.5 °C was suddenly exposed to this low pressure environment. (Assume that we are at sea level.) a) Calculate the w, AU, AH and q for this gas expansion. %3D

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