SELECT * FROM question_mgmt as q WHERE id=1252 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=43 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

(i) Calculate the number of electrons which will together weigh one gram.
(ii) Calculate the mass and charge of one mole of electrons.

Answer:

(i) Mass of an electron = 9.1 x 10-28 g

Or

9.1 x 10-28 g contains = 1 electron

Therefore 1g contains = 1/9.1 x 10-28 *1 = 1.098 x 1027 electrons

 

(ii) We know, one mole of electron = 6.022 x 1023 electron

Mass of one electron = 9.1 × 10–28 g

Or

mass of 6.022 x 1023 electron = 9.1 x 10-28 x 6.022 x 1023 = 5.48 x 10-4 g

Charge on one electron = 1.6 × 10–19 coulomb

Charge on one mole of electron = (1.6 × 10–19 C x 6.022 × 1023)

= 9.63 × 104 C

 


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