SELECT * FROM question_mgmt as q WHERE id=1374 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=46 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Calculate the total number of electrons present in 1.4 g of dinitrogen gas.

Answer:

Mass of the nitrogen = 1.4 g

Molar mass of nitrogen  = 28 g mol–1

Therefore amount of nitrogen = 1.4 / 28 = 0.05 mol

Number of nitrogen molecule in 0.05 mol

= 6.023 x 1023  x 0.05

= 3.0115 x 1022

Also number of electrons in one molecule of nitrogen  = 14

Therefore, total number of electrons in 1.4 g of nitrogen 

= 3.0115 x 1022 x 14 

= 4.22 x 1023


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