Respuesta :

The atomic mass of silicon is 28 g/mol.
Therefore, 521 mg or 0.521 g will be equivalent to;
  0.521/28 = 0.01861 mooles
Atomic mass of cobalt is 27 g/mol
According to Avogadro's law the mass of cobalt that will have the same atom as 52 mg of silicon will be ;
(0.01861 moles × 27) = 0.5024 g or 502.4 mg

Eduard22sly

The mass (in grams) of cobalt that has the same number of atoms as 521 mg of silicon is 1.1 g

How to determine the number of atoms

We'll begin by calculating the number of atoms in 521 mg (i.e 0.521 g) of silicon.

From Avogadro's hypothesis,

28 g of Si = 6.02×10²³ atoms

Therefore,

0.521 g of Si = (0.521 × 6.02×10²³) / 28

0.521 g of Si = 1.12×10²² atoms

How to determine the mass of Cobalt

From Avogadro's hypothesis,

6.02×10²³ atoms = 59 g of cobalt

Therefore,

1.12×10²² atoms = (1.12×10²² × 59) / 6.02×10²³

1.12×10²² atoms = 1.1 g of cobalt

Thus, 1.1 g of cobalt contains the same number of atoms in 521 mg of silicon.

Learn more about Avogadro's number:

https://brainly.com/question/26141731

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