1) The best laboratory vacuum has a pressure of about 1.00 x 10-18 atm, or 1.01 x 10-13 Pa. How many gas molecules are in 5.30 cm3 in such a vacuum at 333 K?

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1) The best laboratory vacuum has a pressure of about 1.00 x 10-18 atm, or 1.01 x 10-13 Pa. How many gas molecules are in 5.30 cm3 in such a vacuum at 333 K?

 

2) Ethyl alcohol has a boiling point of 78.0 ˚C, a freezing point of -114 ˚C, a heat of vaporization of 879 kJ/kg, a heat of fusion of 109 kJ/kg, and a specific heat of 2.43 kJ/kg·K. How much energy must be removed from 0.534 kg of ethyl alcohol that is initially a gas at 78.0 ˚C so that it becomes a solid at -114 ˚C?

 

3)How much water remains unfrozen after 50.3 kJ is transferred as heat from 276 g of liquid water initially at its freezing point? The latent heat of fusion is 333 kJ/kg.

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