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Taking into account the definition of Avogadro's number, 7.59×10²⁴ particles of C₈H₁₈ would be in 12.6 moles of octane.

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.

Amount of C₈H₁₈ particles

Then you can apply the following rule of three: If by definition of Avogadro's number 1 mole of C₈H₁₈ contains 6.023×10²³ particles, 12.6 moles of the compound contains how many particles?

amount of particles of C₈H₁₈= (6.023×10²³ particles × 12.6 mole)÷ 1 mole

amount of particles of C₈H₁₈= 7.59×10²⁴ particles

Finally, 7.59×10²⁴ particles of C₈H₁₈ would be in 12.6 moles of octane.

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