userdata-paziras-Chem101-Chap_11A

Isopropylalcoho lc3h7

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Unformatted text preview: r) MP MELTING (ice + water) (molecules separate) Time ICE WARMING UP (mo lecules vibrate faster) NOTE: There is no temperature change dur ing phase transit ions Reason: During phase transit ions, the energy absorbed is used to separate the mo lecules and not to speed them up + 6.01 kJ/mo le H2O(s) + 40.7 kJ/mo le H2O(l) DH fusio n = + 6.01 kJ/mo le H2O(g) DH vaporizat ion = + 40.7 kJ/mo le 7 Chemistry 101 Chapter 11 Examples: 1. Isopropyl alcoho l (C3H7 - OH) on the skin cools by evaporation. How much heat is absorbed by isopropyl alcoho l if 10.0 g evaporates? (DH vaporizat ion for isopropyl alcoho l = 42.1 kJ/mo l) 1 mo le C3 H7 - OH 42.1 kJ ? kJ = 10.0 g C3H7 - OH x ¾¾¾¾¾¾¾¾¾¾ x ¾¾¾¾¾¾¾¾ = 7.00 kJ 60.1 g C3H7 - OH 1 mo le C3H7 - OH 2. A 35.5 g sam...
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