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Unformatted text preview: kJ/mole. The ionic radii for Na + is 102 pm and for Clis 181 pm. The distance is 283 pm ( )( ) mol kJ pm mol pm kJ x V / 491 283 1 1 10 389 . 1 5 − = − + ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ − = The lattice energy is (1.75x491) + 496 – 342 = 705 kJ/mole 4. A balloon is filled with hydrogen at 25 o C. If the balloon is cooled to 77 K what will be the percent change in the volume if the pressure is constant at two atm. From Charles Law the volume is proportional to the absolute temperature for a fixed amount of gas at constant pressure. The initial temperature is 298.15 K and the final temperature is 77K so the volume change in percent is: (298.1577)/298.15 x 100% = 74.2 % decrease in volume...
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This note was uploaded on 02/13/2009 for the course MASC 110L taught by Professor Goo during the Fall '07 term at USC.
 Fall '07
 Goo

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