Which half-reaction is most easily oxidized?

answer options:
al3+ + 3e- al = -1.66 v
cu2+ + 2e- cu = 0.34 v
fe3+ + e- fe2+ = 0.77 v
na+ + e- na = -2.71 v
pb2+ + 2e- pb = -0.13 v

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.

What would happen to a volleyball left outside in the winter? o o o o a. it would expand. b. it would lose air. c. it would shrink. d. it would explode.

The empirical formula of a compound is ch2o and its mass is 120 amu/molecule, what is its formula?