Which half-reaction is most easily reduced? a. al3+ + 3e- al = -1.66 v b. cu2+ + 2e- cu = 0.34 v c. fe3+ + e- fe2+ = 0.77 v d. na+ + e- na = -2.71 v e. pb2+ + 2e- pb = -0.13 v

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

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The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.