27. Mercury, Hg, freezes at -38.9°C, and condenses at 357°C. The specific heat of liquid mercury is 0.139 J/g°C. Its heat of vaporization is 59.229 kJ/mol and its heat of fusion is 2.295 kJ/mol. How much energy is needed to completely vaporize 10.0 moles of solid mercury starting from -38.9°C?

Calculate the grams of oxygen gas required to produce 7.60 kJ of heat when hydrogen gas burns at constant pressure to give liquid water, given the following: 2H2(g)+O2(g)2H2O(g);H=484kJ Liquid water has a heat of vaporization of 44.0 kJ per mole at 25C.

What feature characterizes the dynamic equilibrium between a liquid and its vapor in a closed container?

Trichloroethane, C2H3Cl3 is used as a degreaser (solvent for waxes and oils). Its density is 1.435 g/mL and its vapor pressure at 20C is 124 mm Hg. (a) How many mL will vaporize in an evacuated 1.50-L flask at 20C? (b) A 3.00-mL sample is poured into an evacuated 1.5-L flask at 20C. Will all the liquid vaporize? If not, what is the pressure in the flask? (c) A similar 3.00-mL sample is poured into an evacuated 20.00-L flask at 20C. What physical state(s) is/are in the flask?

The molar heat of fusion of sodium metal is 2.60 kJ/mol, whereas its heat of vaporization is 97.0 kJ/mol. a. Why is the heat of vaporization so much larger than the heat of fusion? b. What quantity of heat would be needed to melt 1.00 g sodium at its normal melting point? c. What quantity of heat would be needed to vaporize 1.00 g sodium at its normal boiling point? d. What quantity of heat would be evolved if 1.00 g sodium vapor condensed at its normal boiling point?

Liquid butane, C4H10, is stored in cylinders to be used as a fuel. Suppose 35.5 g of butane gas is removed from a cylinder. How much heat must be provided to vaporize this much gas? The heat of vaporization of butane is 21.3 kJ/mol.

Explain why 15 g of steam at 100C melts more ice than 15 g of liquid water at 100C.

Water at 0C was placed in a dish inside a vessel maintained at low pressure by a vacuum pump. After a quantity of water had evaporated, the remainder froze. If 9.31 g of ice at 0C was obtained, how much liquid water must have evaporated? The heat of fusion of water is 6.01 kJ/mol and its heat of vaporization is 44.9 kJ/mol at 0C.

What types of forces exist between the individual particles in an ionic solid? Are these threes relatively strong or relatively weak?

How does the boiling of a liquid differ from its evaporation?