0.386 × 10²³ units of KCl
Explanation:
Potassium K will react with chlorine Cl₂ to produce potassium chloride KCl:
2 K + Cl₂ → 2 KCl
number of moles = mass / molecular weight
number of moles of K = 2.5 / 39 = 0.0641 moles
Taking in account the chemical reaction we devise the following reasoning:
if 2 moles of K produces 2 moles of KCl
then 0.0641 moles of K produces X moles of KCl
X = ( 0.0641 × 2) / 2 = 0.0641 moles of KCl
To find the number of units of KCl (KCl is not a molecule, it is an ionic compound) we use Avogadro's number:
if in 1 moles of KCl there are 6.022 × 10²³ units of KCl
then in 0.0641 moles of KCl there are Y units of KCl
Y = (0.0641 × 6.022 × 10²³) / 1 = 0.386 × 10²³ units of KCl
Learn more about:
Avogadro's number
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