I m a paid user canu please clear these doubt its urgent

Dear Student, 

2) One a.m.u. represents the average mass of a nucleon and is represented by u.
In terms of this unit :
mass of an electron = 0.0055 u
mass of  a proton = 1.0073 u

3) Charge of electrons = -1.60 × 10^-19  C
Mass of 1 electron = 9.11 × 10^-31 Kg 
Using n = q/e
 So, Number of electrons in 1 C = 1/9.11 × 10^-31 Kg
= 1.10 × 10³⁰
So charge for 1 Kg electrons = 1.10 × 10³⁰ × (-1.60 × 10^-19 ) C
= - 1.76× 10¹¹ C



Hope this information will clear your doubts about the topic.

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