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Willchemistry
Atomic mass C = 12 u.m.a

12 g ------------------ 6.02x10²³ atoms
3.50 g -------------- ??

3.50 x ( 6.02x10²³) / 12 =

2.107x10²⁴ / 12 => 1.755x10²³ atoms

hope this helps!


mickymike92

The number of atoms in 3.50 g of 12C is 1.75 × 10^23 atoms.

What is Avogadro number?

The Avogadro number is the number of particles in a mole of any substance.

The Avogadro number = 6.02 × 10^23 particles

1 mole of 12C has a mass of 12 g

Number of atoms in 3.50 g of 12C = 6.02 × 10^23 × 3.50/12 = 1.75 × 10^23 atoms.

Learn more about Avogadro number at: https://brainly.com/question/16060199