(IIT-JEE 2001) How many moles of electrons weigh one kilogram? — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question

💡 Solution & Explanation

Mass of 1 electron $\approx 9.1 \times 10^{-31}$ kg. <br>Mass of 1 mole of electrons $= 9.1 \times 10^{-31} \times 6.022 \times 10^{23}$ kg. <br>Number of moles in 1 kg $= 1 / (9.1 \times 10^{-31} \times 6.023 \times 10^{23}) = \frac{1}{9.108 \times 6.023} \times 10^{8}$ mol. [1, 2]