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Unformatted text preview: 1680 kJ 85. A 0.250 chunk of sodium metal is cautiously dropped into a mixture of 50.0 g of water and 50.0 g of ice (in equilibrium). The reaction is: 2 Na(s) + 2 H 2 O(l) 2 NaOH(aq) + H 2 (g) DH = -368kJ Will the ice melt? Assuming that the sodium hydroxide mixture has the same specific heat as water, calculate the final temperature. The reaction doesnt release enough heat to melt all the ice. The temp of water will remain at 0 C. 87. An ice cube train contains enough water at 22.0 C to make 18 ice cubes, each of which has a mass of 30.0 g. The tray is placed in a freezer that uses CF 2 Cl 2 as a refrigerant. The heat of vaporization of CF 2 Cl 2 is 158 J/g. What mass of CF 2 Cl 2 must be vaporized in the refrigeration cycle to convert all of the water at 22 C to ice at -5 C? 1490 g...
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