4. In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1? (A) The mole fraction of NaCl. (B) The mass fraction of NaCl. (C) The mass percent of NaCl. (D) The molality of NaCl. (E) All of these are about 0.1.

8. Which of the following statements is false? (A) An orbital can accommodate at most two electrons. (B) The electron density at a point is proportional to ψ2 at that point. (C) The spin quantum number of an electron must be either + . (D) A 2p orbital is more penetrating than a 2s; i.(E), it has a higher electron density near the nucleus and inside the charge cloud of a 1s orbital.

4. In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1?
(A) The mole fraction of NaCl.
(B) The mass fraction of NaCl.
(C) The mass percent of NaCl.
(D) The molality of NaCl.
(E) All of these are about 0.1.

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4. In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1?(A) The mole fraction of NaCl.(B) The mass fraction of NaCl.(C) The mass percent of NaCl.(D) The molality of NaCl.(E) All of these are about 0.1.

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4. In a 0.1 molar solution of NaCl in water, which one of the following will be closest to 0.1?
(A) The mole fraction of NaCl.
(B) The mass fraction of NaCl.
(C) The mass percent of NaCl.
(D) The molality of NaCl.
(E) All of these are about 0.1.