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36.5% HCl has density equal to 1.20gmL^(...

`36.5% HCl` has density equal to `1.20gmL^(-1)`. 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" xx 10 xx d)/(Mw _(2)) = ( 36. 5 xx 10 xx 1.2)/( 36.5) = 12 M`
`m = ( 36.5 xx 1000)/(36.5 xx (100 - 36.5)) = (1000)/( 63.5) = 15. 7 m`
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