19.5 g O2 is equal to how many moles of O2? moles O2

Explanation:

Molar mass of O2: 32g/mol

Moles of O2 = 19.5 / 32 = 0.609mol

All the oxides and hydroxides of metals are basic in nature.

Magnesium oxide is also basic in nature and is a water insoluble base.

When a dilute acid reacts with a base it forms salt and water because the acidity and basicity of the acid and base respectively neutralise each other.This process is known as neutralisation reaction.

When MgO reacts with HCl it forms MgCl2 and water.

In equation form

MgO + 2HCl — MgCl² + H2O