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Question

Chemistry Question on Mole concept and Molar Masses

The mass of one mole of electron is

A

9.1×10−28 g9.1 \times 10^{-28} \, g

B

0.55 mg

C

9.1×10−24 g9.1 \times 10^{-24} \, g

D

6×10−12 g6 \times 10^{-12} \, g

Answer

0.55 mg

Explanation

Solution

∵\because Mass of one electron = 9.1×10−319.1 \times 10^{-31} kg = 9.1×10−289.1 \times 10^{-28} g ∵\because Mass of 1 mole of electrons, i.e., mass of 6.023×10236.023 \times 10^{23} = 9.1×10−28×6.023×10239.1 \times 10^{-28} \times 6.023 \times 10^{23} electron =5.48×10−4= 5.48 \times 10^{-4} = 0.00055 g = 0.55 mg