Question:
1 mole of electrones collectively weigh?
a)0.11mg
b)0.22mg
c)0.44mg
d)0.55mg
Answer:
1 electron weigh 9.11 x 10-31 Kg
1 mole of of electron is 6.022 x 1023
So, 9.11 x 10-31 Kg/1 x 6.022 x 1023 = 5.48 x 10-7 Kg = 0.548 = 0.55 mg
Answer id (d) 0.55 mg
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