A) \[1m\]
B) \[0.5m\]
C) \[0.2m\]
D) \[2m\]
Correct Answer: C
Solution :
molality, \[m=\frac{{{W}_{B}}\times 1000}{{{M}_{B}}\times {{W}_{A}}};\]where \[{{W}_{B}}\] = weight of solute (g), \[{{M}_{B}}\] = molecular weight of solute and \[{{W}_{B}}\] = weight of solvent (g). \[m=\frac{18\times 1000}{180\times 500}=0.2\]\[=0.2\]
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