一條關於Reacting masses的選擇題

The answer is B.

1 mol of MgCl2 contains 1 mol of Mg2+ ions and 2 mol of Cl- ions.
1 mol = 6.02 x 1023 units (Avogadro number)
Therefore, 1 mol of MgCl2 contains 6.02 x 1023 Mg2+ ions and 2 x 6.02 x 1023 Cl- ions.

A. Incorrect
It is 1 mol of Mg2+ ions and 2 mol of Cl- ions, but is not 2 mol of Mg2+ and 1 mol of Cl- ion.

B. Correct
Refer to the above explanation.

C. Incorrect
The number of 1 mol of Mg2+ ions is only a half of the number of 2 mol of Cl- ions, but not equal.

D. Incorrect
It is 1 mol of Mg2+ ions and 2 mol of Cl- ions, but not 1 Mg2+ ions and 2 Cl- ions.
=

Is that D?

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