12. A container fitted with a piston contains oxygen gas and is heated slightly. As it is heated, the density of the oxygen gas (A)increases. (B)decreases. (C)stays the same. (D)all of above are possible. (E)none of these.

7. Which of the following solutions contains the greatest total ion concentration? (A)One mole of potassium chloride dissolved in 1.0 L of solution. (B)One mole of iron(II) nitrate dissolved in 1.0 L of solution. (C)One mole of potassium hydroxide dissolved in 1.0 L of solution. (D)One mole of sodium phosphate dissolved in 1.0 L of solution. (E)At least two of the above solutions have an equal number of ions, and these contain the greatest total ion concentration.

12. A container fitted with a piston contains oxygen gas and is heated slightly. As it is heated, the density of the oxygen gas
(A)increases.
(B)decreases.
(C)stays the same.
(D)all of above are possible.
(E)none of these.

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