SELECT * FROM question_mgmt as q WHERE id=1587 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=9 AND chapterId=57 and ex_no='2' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question:

Calculate the mass percentage of aspirin (C9H8O4) in acetonitrile (CH3CN) when 6.5 g of C9H8O4 is dissolved in 450 g of acetonitrile (CH3CN).

Answer:

Mass of aspirin (C9H8O4) = 6.5g  (given)

Mass of acetonitrile (CH3CN) = 450g (given)

Now total mass of the solution = 6.5 + 450 = 456.5g

Therefore mass percentage of aspirin (C9H8O4)  = (6.5 / 456.5 ) x 100

= 1.42 %


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