Question

Compute the difference in masses of `10^(3)` moles of each of magnesium atoms and magnesium ions. (Mass of an electron `=9.1 xx 10^(-31)`kg)

Answer 1

Mg atoms and `Mg^(2+)` ion differ by eectrons=2
`10^(3)` moles of Mg atoms and `Mg^(2+)` ions differ in electrons=`10^(3)xx2"moles"`
Mass of one electron=`9.1xx10^(-31)"kg"`
`"Mass of "10^(3)xx2"moles of elctrons"=10^(3)xx2xx6.022xx10^(23)xx9.1xx10^(-31)"kg"`
`=109.6xx10^(-5)"kg"=1.096xx10^(-3)"kg"`