Question

molecular formula of mercuric oxide by criss-cross method

Answer 1

Mercuric Oxide : (see attachment)

Hope it helps..............

Answer 2

The molecular formula of mercury oxide is HgO

Explanation

• One of the methods to write the molecular formula is the criss-cross method.
• In this method, The numerical value representing the charge of the ion of the atoms is crossed over and becomes the subscript of the other ion.
• We have to write the chemical formula of mercuric oxide.

• we know that,

• The atomic number of Mercury = 80
• Valency of Mercuric ion = +2

• This implies that it has 2 electrons in its outer shell for bonding.

• The atomic number of Oxygen = 16 Valence of oxygen = -2

• That is, it needs 2 electrons for bonding.

• Applying cross - the cross method for this compound -

Hg⁺² O⁻²

×

2 2

• The chemical on crisscrossing is Hg₂O₂
• This is simplified to HgO.

Therefore,

Therefore,the Chemical formula of Mercuric(III) Oxide is HgO

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