SELECT * FROM question_mgmt as q WHERE id=1225 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=2 AND subId=9 AND chapterId=42 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Calculate the mass percent of different elements present in sodium sulphate (Na2SO4).

Answer:

The molecular formula of sodium sulphate is (Na2SO4).

Molar mass = atomic mass of Na(23) + atomic mass of S(32.066) + atomic mass of O(16)

Molar mass of (Na2SO4) = [(2 × 23.0) + (32.066) + 4 (16.00)] = 142.066 

Mass percent of an element 

 

∴ Mass percent of sodium: 

 

Mass percent of sulphur:

 

Mass percent of oxygen:

 

 


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