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Q.

36.5% HCI has density equal to 1 .20 gm L-1. The molarity (M) and molality (m), respectively, are

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a

15.7, 15.7

b

12, 12

c

15.7, 12

d

12, 15.7

answer is D.

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Detailed Solution

M=% by weight ×10×dMw2=36.5×10×1.236.5=12Mm=36.5×100036.5×(100−36.5)=100063.5=15.7m
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