Question

Magnesium and iron are metallic elements. How does a mole of magnesium compare with a mole of iron?

a) A mole of iron has more atoms.
b) They both have the same mass.
c) A mole of magnesium has more mass.
d) They both have the same number of atoms.

Answer 1

Answer: d) They both have the same number of atoms.

Step-by-step explanation:

A mole is defined as the amount of substance that contains Avogardro number of the substance. Avogadro's number is given by
`6.022* 10^(23)`.

`1mole=6.022* 10^(23)particles`

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number
`6.023* 10^(23)`

Thus 1 mole of magnesium and iron both contains
`6.023* 10^(23)` particles.

Answer 2

Given a mole each for iron and magnesium, the number of atoms of each element is equal. Iron has a greater mass due to its greater molecular weight. The correct statement among the choices is D.