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In 8 hours duration, with uniform decrea...

In 8 hours duration, with uniform decreases in temperature, the temperature dropped 24°. How many degrees did the tempearture drop each hour?

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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cylinder of volume 30 liters has an initial gauge pressure of 15 atm and a temperature of 27°C. After some oxygen is withdrawn from the cylinder, the gauge pressure drops to 11 atm and its temperature drop to 17°C. Estimate the mass of oxygen taken out of the cylinder.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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