Respuesta :

Willchemistry
Molar mass C5H12 = 12 x 5 + 1 x 12 => 72 u

number of moles = 25 / 72 => 0.3472 moles

C => 5 atoms ( 0.3472 x 5 ) => 1.736 moles C

1 mole ------------------ 6.02 x 10²³ atoms
1.736 moles ----------- ( atoms C )

atoms C = 1.736 x ( 6.02 x 10²³ ) / 1

= 1.04 x 10²⁴ atoms of C

hope this helps!

The atoms of C are there in 25 grams of C5H12 is :

  • Molar mass C5H12 = 12 x 5 + 1 x 12 => 72 u
  • Number of moles = 25 / 72 => 0.3472 moles
  • C => 5 atoms ( 0.3472 x 5 ) => 1.736 moles C

1 mole ------------------ 6.02 x 10²³ atoms

1.736 moles ----------- ( atoms C )

atoms C = 1.736 x ( 6.02 x 10²³ ) / 1

Atom C of Pentane= 1.04 x 10²⁴ atoms of C

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