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The density of 1 M solution of a compound 'X' is 1.25 g mL$^{-1}$. The correct option for the molality of solution is (Molar mass of compound X = 85 g):
A
0.705 m
B
1.208 m
C
1.165 m
D
0.858 m
Detailed Solution
$m=\dfrac{1000\times M}{1000\times d-M\times M_w}=\dfrac{1000\times1}{1000\times1.25-1\times85}=\dfrac{1000}{1165}=0.858$ m.