What is the mass of in 5 tablets of iron if the number of moles of is 4.2225 x mol. [ Ar = Fe, 56 ]

Approximately in total for the five tablets.

(Approximately per tablet.)

Explanation:

The relative atomic mass of an element is the ratio between:

The definition of moles ensures that the relative atomic mass of an element is approximately numerically equal to the mass (measured in grams) of one mole of the atoms of this element.

The question states that the relative atomic mass of iron is . In other words, the mass of one mole of iron atoms would be approximately .

The question is asking for the mass of some amount of ions. Each ion contains two fewer electrons than a neutral atom. Hence, of ions might be lighter than the same number of atoms by a very small extent: The mass of one mole of electrons is approximately , much smaller than the mass of the same number of atoms (approximately .)

Estimate the mass of these of ions using the mass of the same number of atoms:

.

Five of these tablets would contain approximately of ions.

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