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6.) To determine the density of ethyl alcohol, a student pipets a 500 mL sample into an empty flask weighing 15.246g. They find that the mass of the flask - ethyl alcohol is 19.171g. Calculate the density of ethyl alcohol. a. 0.785 g/mL b. 3.925 g/mL c. 0.785 g/L d. 3.925 g/L 7.) What is the electrical charge of the nucleus? a. A nucleus always has a positive charge b. A stable nucleus has a positive charge, but a radioactive nucleus may have no charge c. A nucleus always has no charge and is instead neutral d. As stable nucleus has no charge and is instead neutral, but a radioactive nucleus may have a charge