Considering the definition of molar mass and Avogadro's Number, there are 2.77048×10²² atoms in 8 g of potassium sulfate.
Definition of molar mass
The molar mass of substance is a property defined as its mass per unit quantity of substance.
In other words, molar mass is the amount of mass that a substance contains in one mole.
Definition of Avogadro's Number
Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Number of atoms in 8 g of potassium sulfate
In first place, the molar mass of potassium sulfate K₂SO₄ is 174.2 g/mole. So, you can apply the following rule of three: If by definition of molar mass 174.2 grams are contained in 1 mole, 8 grams of the compound are contained in how many moles?
[tex]number of moles=\frac{8 grams x1 mole}{174.2 grams}[/tex]
number of moles=0.046 moles
Now you can apply another rule of three as follow: If by definition of Avogadro's number 1 mole of the compound contains 6.023×10²³ atoms, 0.046 moles of the compound contains how many atoms?
amount of moles of potassium sulfate= (6.023×10²³atoms × 0.046 moles)÷ 1 mole
amount of moles of potassium sulfate= 2.77048×10²² atoms
Finally, there are 2.77048×10²² atoms in 8 g of potassium sulfate.
Learn more about
molar mass:
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Avogadro's Number:
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