The chemical formula of propane is C3H8. Which number correctly uses scientific notation to represent the number of atoms in 2.00 moles of propane?

Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We do as follows:

2.00 mol C3H8 ( 6.022 x 10^23 atoms / mole ) = 1.204x10^24 atoms C3H8

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CintiaSalazar CintiaSalazar · Answer 2 · 2020-04-20T02:44:50+02:00

Answer:

1.2046*10²⁴ atoms

Explanation:

Avogadro's Number or Avogadro's Constant to the number of particles that constitute 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 represents a quantity without an associated physical dimension, so it is considered a pure number that allows describing a physical characteristic without dimension or explicit unit of expression. The Avogadro number applies to any substance.

Then a rule of three applies as follows: if 1 mole has 6,023 * 10²³ atoms, 2 moles how many atoms will it contain?

[tex]number of atoms=\frac{2 moles*6.023*10^{23} }{1mole}[/tex]

number of atoms=1.2046*10²⁴ atoms

This number is already represented in scientific notation.