1. (4 pts.) In 2018 the Michigan Department of Environment, Great Lakes, and Energy tested the water in 30 homes in Benton Harbor, MI. Eight out of 30 of the homes tested
had Pb2+ concentrations higher than 15 ppb. Remember a ppb is one microgram per
liter (1 ug/L). Change 15 ppb of Pb2+ into g/L and moles/L. Show all your work below!

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.