An aqueous solution of 1.69 M hydrochloric acid, HCl, has a density of 1.03 g/mL. The percent by mass of HCl in the solution is

The sum of the oxidation numbers in a neutral compound is always

4. propanol and isopropanol are isomers. this means that they have a) the same molecular formula but different chemical properties. b) different molecular formulas but the same chemical properties. c) the same molecular formula and the same chemical properties. d) the same molecular formula but represent different states of the compound

What causes the appearance of lines in a emission spectrum