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An oxygen cylinder of volume 30 liters h...

An oxygen cylinder of volume 30 liters has an initial gauge pressure of 15 atm and a temperature of 27°C. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atm and its temperature drop to 17°C. Estimate the mass of oxygen taken out of the cylinder. (R = 8.31 J mol-1 K_1, molecular mass of O2 = 32 u).

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Under the initial conditions, V = 30 liter = 30 x 10-3 m-3, P = 15 atm = 15 x 1.01 x 105 Pa T = 27 °C = 273 + 27 = 300 K. Also, R = 8.31 J mol-1 K-1 and molar mass, M = 32 x 10″3 kg. ∴ Using the relation PV = μRT
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