23.43 grams of KOâ‚‚ is needed to form 8.0 g of Oâ‚‚
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, KOâ‚‚, and COâ‚‚, to get Oâ‚‚, 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 KOâ‚‚ you will get 3 moles of Oâ‚‚, or a ratio of moles of KOâ‚‚: moles of Oâ‚‚ = 4: 3
If we want to get 8 grams of Oâ‚‚, then the number of moles of Oâ‚‚ becomes:
mole Oâ‚‚ = gram: molecular mass of Oâ‚‚
mol Oâ‚‚ = 8 gram: 32
mol Oâ‚‚ = 0.25
so the number of KOâ‚‚ moles needed: (we use a ratio of KOâ‚‚ and Oâ‚‚ moles)
mol KOâ‚‚ = 4/3 x mol Oâ‚‚
KO KO2 = 4/3 x 0.25
mol KO2 = 0.33 mol
So the number of grams of KOâ‚‚ needed
gram KOâ‚‚ = mol x molecular mass KOâ‚‚
gram KOâ‚‚ = 0.33 x 71
gram KOâ‚‚ = 23.43
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Keywords: mole, KOâ‚‚, Oâ‚‚, breathing equipment