In the compound Al2O3, the ratio of aluminum to oxygen is?

2:3

Explanation:

The compound whose chemical formula is given in the question is called Aluminium oxide. It is structurally made up of two atoms of aluminum (Al) and three atoms of oxygen (O).

Based on the above, the atomic ratio of aluminum to oxygen can be calculated as 2:3 i.e. 2 atoms of aluminum to 3 atoms of oxygen.

is there any options? maybe im just not seeing them but i need the options to

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substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.