What is the mass of 1 kg of electron?
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ᴛʜᴇ ᴇʟᴇᴄᴛʀᴏɴ's ʀᴇsᴛ ᴍᴀss ɪs 9.11 × 10ˉ³¹ ᴋɢ, sᴏ 1 ᴋɢ ᴡᴏᴜʟᴅ ᴄᴏɴsɪsᴛ ᴏғ 1.1 × 10³⁰ ᴇʟᴇᴄᴛʀᴏɴs. ᴅɪᴠɪᴅᴇ ᴛʜɪs ʙʏ ᴀᴠᴏɢᴀᴅʀᴏ's ɴᴜᴍʙᴇʀ, 6.022 × 10²³ ᴘᴀʀᴛɪᴄʟᴇs/ᴍᴏʟᴇ, ᴛᴏ ɢᴇᴛ 1.8 × 10⁶ ᴍᴏʟ. ᴍᴀss ᴏғ ᴀɴ ᴇʟᴇᴄᴛʀᴏɴ= 9.1 x 10^-31 ᴋɢ.
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The electron's rest mass is 9.11 × 10ˉ³¹ kg, so 1 kg would consist of 1.1 × 10³⁰ electrons. Divide this by Avogadro's number, 6.022 × 10²³ particles/mole, to get 1.8 × 10⁶ mol. Mass of an electron= 9.1 x 10^-31 Kg.
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