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36.5% HCl has density equal to 1.20 g mL...

36.5% HCl has density equal to 1.20 g `mL^(-)`. The molarity (M) and molality (m), respectively, are

A

15.7, 15.7

B

12, 12

C

15.7, 12

D

12, 15.7

Text Solution

Verified by Experts

The correct Answer is:
D
`M=(% "by weight"xx10xxd)/(Mw_(2))`
`=(36.5xx10xx1.2)/(36.5)=12M`
`m=(36.5xx1000)/(36.5xx(100-36.5))=1000/(63.5)=15.7m`
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