A 49.0-9 sample of solid potassium bromide is mixed in a beaker with 126 9 of water to give 141 mL of a colorless transparent liquid. (a) What is the density of this liquid? g/mL (b) Is this liquid a pure substance, a homogeneous mixture or a heterogeneous mixture? (c) When an equal volume of the molecular liquid tetrabromoethane is added to the beaker, two layers are seen to form. The contents of the beaker are now a (d) If the density of liquid tetrabromoethane is 2.96 g/mL, is tetrabromoethane the layer on the top in the beaker or the layer on the bottom