The standard heat of formation of nabr is -360.0 kj mol-1. the energy needed to vaporize one mole of br2(l) to give br2(g) is 31 kj mol-1. energy needed to vaporize one mole of na(s) is 107.8 kj. the first ionization energy of na is 495.4 kj mol-1. the bond energy of br2 is 192 kj per mole of br—br bonds. the lattice energy of nabr is -743.3 kj mol-1.
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Lake Powell, formed by Glen Canyon Dam,is not a lake.It is a reservoir, with a constantly fluctuating water level--more like a bathtub that is never drained than a true lake.