Question

What is the mass of 1/2 mole of electron when the mass of electron given is 9.1*10^-28

Answer 1

Dear Student

The 1/2 mole of electron contains = 3.012 x 10²³ electrons
The mass of an electron = 9.1 x 10^-28 g
The mass of 1/2 mole of electron =
$$\begin{gathered} =9.1\times {10}^{-28}\times 3.012\times {10}^{23} \\ =27.404\times {10}^{-5}g \\ =2.74\times {10}^{-4}g \end{gathered}$$

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