The molecular liquid chloroethane (C2H5CI) has a density of 0.920 g/mL, while the molecular liquid bromoethane (C2H5Br) has a density of 1.47 g/mL. (a) When 49.2 mL of C2H5Cl and 61.7 mL of C2H5Br are mixed, a clear liquid solution forms. Is this a chemical or a physical change? Is the solution a pure substance, a homogeneous mixture or a heterogeneous mixture? (b) Is the density of this solution a chemical or a physical property? (c) Assuming that the volumes are additive upon mixing, what is the density of the solution? g/mL