How many moles of hydrogen atom are present in one mole of Aluminium

How many moles of hydrogen atom are present in one mole of Aluminium hydroxide?

One mole

Two moles

Three moles

Four moles

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This question was previously asked in

UPSC NDA-2 – 2016

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The chemical formula for Aluminium hydroxide is Al(OH)₃. This formula indicates that one molecule of Aluminium hydroxide contains one atom of Aluminium (Al) and three hydroxide groups (OH). Each hydroxide group (OH) consists of one Oxygen atom (O) and one Hydrogen atom (H). Therefore, one molecule of Al(OH)₃ contains a total of 3 hydrogen atoms (one in each of the three OH groups).

A mole is a unit of amount of substance, equal to Avogadro’s number (approximately 6.022 × 10²³) of elementary entities (atoms, molecules, ions, etc.). If one molecule contains a certain number of atoms of a particular element, then one mole of molecules will contain the same number of moles of those atoms.

In one mole of Al(OH)₃ molecules, there are Avogadro’s number of Al(OH)₃ molecules. Since each molecule has 3 hydrogen atoms, there are 3 × (Avogadro’s number) of hydrogen atoms. This quantity of hydrogen atoms represents 3 moles of hydrogen atoms.

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