**Assertion (A):** of electrons weighs . <br>**Reason (R):** The mass of one electron is . — Mole Concept and Some Basic Concepts of Chemistry Chemistry Question
Question
**Assertion (A):** $1 \text{ mole}$ of electrons weighs $0.55 \text{ mg}$. <br>**Reason (R):** The mass of one electron is $9.1 \times 10^{-31} \text{ kg}$.
Answer: A
💡 Solution & Explanation
$\text{Mass of 1 mole} = (9.1 \times 10^{-28} \text{ g}) \times (6.022 \times 10^{23}) \approx 0.00055 \text{ g} = 0.55 \text{ mg}$. The calculation relies directly on the mass of a single electron. [1, 11]
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