Question

Compare 1 mole of H2, 1 mole of O2 and 1 mole of F2

(a)which has the largest number of molecule?explain why
(b)which has the greatest mass? explain why

Answer 1

Step-by-step explanation:

(a) As per the mole concept, one mole of any atom contains
`6.022 * 10^(23)` atoms or molecules, that is, Avogadro's number of atoms.

Therefore, 1 mole of
`H_(2)` =
`2 * 6.022 * 10^(23)` molecules

=
`1.2044 * 10^(23)` molecules

1 mole of
`O_(2)` =
`2 * 6.022 * 10^(23)` molecules

=
`1.2044 * 10^(23)` molecules

1 mole of
`F_(2)` =
`2 * 6.022 * 10^(23)` molecules

=
`1.2044 * 10^(23)` molecules

Hence, there are equal number of molecules present in the given atoms.

(b) Mass of each given atom will be calculated as follows.

Mass = no. of moles × molar mass

As one molecule of
`H_(2)` contains 2 atoms of hydrogen.

So, mass of 1 mole of
`H_(2)` =
`2 mol * 1.008 g/mol`

= 2.016 g

mass of 1 mole of
`O_(2)` =
`2 mol * 15.999 g/mol`

= 31.996 g

mass of 1 mole of
`F_(2)` =
`2 mol * 18.998 g/mol`

= 37.996 g

Thus, we can conclude that
`F_(2)` has the greatest mass.