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  • Compute the difference in masses of 10^3 moles each of magnesium atoms and magnesium ions (Mass \: of \: an\: electron = 9.1\times 10^{-31} kg)

Compute the difference in masses of 10^3 moles each of magnesium atoms and magnesium ions. (Mass \: of \: an\: electron = 9.1\times 10^{-31} kg)

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Mg^{2+}ion and Mg atom differ by two electrons.

 10^3 moles of Mg^{2+} and Mg atoms would differ by 2 \times 10^3 moles of electrons.

Mass of  2 \times 10^3 moles of electrons.

= 2 \times 10 ^3 \times 6.023 \times 10^{23} \times 9.1 \times 10^{-31} kg

\Rightarrow 2 \times 6.022 \times 9.1 \times 10^{-5} kg

\Rightarrow 109.6004 \times 10^{-5} kg

\Rightarrow 1.096 \times 10^{-3} kg

The mole concept is a convenient method of expressing the amount of a substance. Any measurement can be broken down into two parts – the numerical magnitude and the units in which the magnitude is expressed. For example, when the mass of a ball is measured to be 2 kilograms, the magnitude is ‘2’ and the unit is ‘kilogram’.

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