Question

6. Regarding the formula Al2O3 which of the following is accurate? A. The coefficient 3 indicates that there are a total of three atoms of oxygen present in the substance. B. The subscript 2 indicates that two atoms of oxygen are present in the substance. C. The chemical symbol Al indicates that oxygen is present in the substance. D. The subscript 2 indicates that two atoms of aluminum are present in the substance.

Answer 1

The correct answer is D.

Answer 2

The correct answer is

D. The subscript 2 indicates that two atoms of aluminum are present in the substance.

In fact, the formula of the substance is

$Al_2 O_3$

the subscript 2 indicates that there are 2 atoms of Aluminium, while the subscript 3 indicates there are 3 atoms of oxygen, so option D is correct.

Option A is wrong because 3 is not a coefficient, is a subscript. Option B is wrong because the subscript 2 refers to the aluminium, not to the oxygen, and option C is wrong because the symbol Al refers to aluminium, not oxygen.