39. Chlorine exists naturally as a mixture of chlorine-35 and chlorine-37 isotopes. An atom of chlorine-35 contains(A)17 protons, 18 neutrons, 17 electrons.(B)16 protons and 17 electrons, only.(C)18 protons, 18 electrons, and 17 neutrons.(D)17 protons, 35 neutrons, and 17 electrons.

4. To calculate the concentration in molarity of a salt solution, you need to know (A)The mass of the salt added and the volume of water added to the solution. (B)The mass of the salt added to the solution and the total volume of the solution. (C)The mass of the salt added, the molar mass of the salt, the volume of water added to the solution. (D)The molar mass of the salt and the total volume of the solution. (E)The mass of the salt added, the molar mass of the salt, the volume of water added, and the total volume of the solution.

39. Chlorine exists naturally as a mixture of chlorine-35 and chlorine-37 isotopes. An atom of chlorine-35 contains

(A)17 protons, 18 neutrons, 17 electrons.

(B)16 protons and 17 electrons, only.

(C)18 protons, 18 electrons, and 17 neutrons.

(D)17 protons, 35 neutrons, and 17 electrons.

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