The mass of half mole of electrons ...
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The mass of half mole of electrons is about (given of electron=9.1x10-28 g) (A)0.546 mg (B)0.273 mg (C)1.0926 mg (D) 4.55 mg

JEE/Engineering Exams
Chemistry
Solution
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one electron weighs ( 9.1 times 10^{-28} mathrm{g} ) 1mole has ( 6.022 times 10^{23} ) electrons ( / ) particles. Mass of 1 mole of electron ( =9.1 times 10^{-28} times 6.022 times 10^{23} ) ( =54.8 times 10^{-5} mathrm{g} ) Half mole of electron ( =54.8 times 10^{-5} / 2 ) ( =27.4 times 10^{-5} mathrm{g} ) ( =0.274 mathrm{mg} ) Hence Option(B) is correct answer
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