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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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Knowledge Check

  • 36.5% HCl has density has density equal to 1.20 g mL^(-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

  • 25 g of a solute of molar mass 250 g mol^(-1) is dissolved in 100 ml of water to obtain a solution whose density is 1.25 g ml^(-1) . The molarity and molality of the solution are respectively

    A
    0.75 and 1
    B
    0.8 and 1
    C
    1 and 0.8
    D
    1 and 0.75

  • If the density of a solvent is greater than 1 kg. dm^(-3) then the molarity (M) and molality (m) are related as

    A
    M gt m
    B
    m gt M
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    m = M
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