Practice

A rigid compressed-air tank has an internal volume of $0.8\,\text{m}^3$. Its pressure gauge reads 600 kPa, the local atmospheric pressure is 101 kPa, and the air in the tank is at 27 °C. Treating air as an ideal gas with $R=0.287\,\text{kJ/(kg·K)}$, the mass of air in the tank is most nearly:

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