0.450 gram of Fe contains how many atoms?

0.450 grams of Fe contains 4.85*10²¹ atoms

Explanation:

Molar mass is the mass of one mole of a substance, which can be an element or a compound.

In this case, the molar mass of iron Fe is 55.85 g / mole. Then you can apply the following rule of three: if by definition of molar mass 1 mole of Fe contains 55.85 grams, then how many moles will contain 0.450 grams?

amount of moles of Fe=8.06*10⁻³ moles

On the other hand, Avogadro's Number is called the number of particles that make up 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 applies to any substance.

Then you can apply the following rule of three: if by definition of Avogadro's Number 1 mole of Fe contains 6.023*10²³ atoms, 8.06*10⁻³ moles how many atoms does it contain?

amount of atoms=  4.85*10²¹ atoms

0.450 grams of Fe contains 4.85*10²¹ atoms

answers: to make sure that all of the broken pieces of tablet were added to the water, to allow for fair comparison of all three trials, with different particle sizes to avoid experimental error

a electronegativity decreases beacuse the size of nucleus is bigger.