23.43 grams of KO₂ is needed to form 8.0 g of O₂
Further explanation
Stochiometry in Chemistry learns about chemical reactions mainly emphasizing quantitative, such as calculations of volume, mass, number, which are related to the number of actions, molecules, elements, etc.
In chemical calculations, the reaction can be determined, the number of substances that can be expressed in units of mass, volume, mole, or determine a chemical formula, for example, the substance level or molecular formula of the hydrate.
The reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products.
In the reaction equation there are also manifestations of reagent substances namely gas (g), liquid (liquid / l), solid (solid / s) and solution (aqueous / aq).
The reaction between potassium superoxide, KO₂, and CO₂, to get O₂, is usually used by rescue teams in the form of breathing equipment
4KO₂ + 2CO₂ → 2K₂CO₃ + 3O₂
From the above equation the reaction shows that for every 4 moles of KO₂ you will get 3 moles of O₂, or a ratio of moles of KO₂: moles of O₂ = 4: 3
If we want to get 8 grams of O₂, then the number of moles of O₂ becomes:
mole O₂ = gram: molecular mass of O₂
mol O₂ = 8 gram: 32
mol O₂ = 0.25
so the number of KO₂ moles needed: (we use a ratio of KO₂ and O₂ moles)
mol KO₂ = 4/3 x mol O₂
KO KO2 = 4/3 x 0.25
mol KO2 = 0.33 mol
So the number of grams of KO₂ needed
gram KO₂ = mol x molecular mass KO₂
gram KO₂ = 0.33 x 71
gram KO₂ = 23.43
Learn more
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Keywords: mole, KO₂, O₂, breathing equipment
