Results in a decrease in the number of c-z bonds, where z is an element that is more electronegative than carbon (usually o, n, or x). results in a decrease in the number of c-h bonds. conformations are the different arrangement of atoms that are interconverted by rotation about a single bond. bonds are located in the plane of the chair conformation of cyclohexane. steric strain is an increase in energy resulting when atoms are forced too close to one another.

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.