How many iron atoms are present in 0.552 mol of iron?

Explanation:

The number of atoms can be found by using the formula

N = n × L

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

N = 0.552 × 6.02 × 10²³

We have the final answer as

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pure substance: iron,copper

impure substance: water,charcoal