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What will be the ratio of magnesium atoms to oxygen atoms in three units of magnesium oxide?

Answer and explanation

Correct answer: One to one

Magnesium oxide has the formula MgO, which shows that each formula unit contains one magnesium atom and one oxygen atom. Three formula units therefore contain three magnesium atoms and three oxygen atoms. The ratio is 3:3, which simplifies by dividing both terms by 3 to 1:1. The number of units changes the quantities but not the fixed composition of the compound, so option A is correct.

Related tags

ScienceClass 10Chemical FormulaMagnesium OxideRatioChemical Reactions And EquationsChemical Substances – Nature And BehaviourChemical Substances Nature And Behaviour

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